Treasury Stock, Value Treasury stock - common, at cost - none at September 30, 2011; 693,974 shares at December 31, 2010 Retained earnings Retained Earnings (Accumulated Deficit), Total Retained Earnings (Accumulated Deficit), Beginning Balance Retained Earnings (Accumulated Deficit), Ending Balance Accumulated Other Comprehensive Income (Loss), Net of Tax Ending Balance Beginning Balance Accumulated Other Comprehensive Income (Loss), Net of Tax, Total Accumulated other comprehensive income (loss), net Shareholders' equity Stockholders' Equity Attributable to Parent Stockholders' Equity Attributable to Parent, Ending Balance Stockholders' Equity Attributable to Parent, Beginning Balance Total shareholders' equity Total stockholders' equity Additional paid-in capital Additional Paid in Capital, Total Additional Paid in Capital, Beginning Balance Additional Paid in Capital, Ending Balance Liabilities and Stockholders' Equity Total liabilities and shareholders' equity Stockholders' Equity Attributable to Parent [Abstract] Shareholders' equity Liabilities Liabilities Liabilities Total liabilities Liabilities assumed Long-term Debt Long-term borrowings Long-term borrowings Long-term borrowings Federal funds purchased and agreements to repurchase securities Federal Funds Purchased and Securities Sold under Agreements to Repurchase, Total Deposits Total deposits Deposits Assets Loans and Leases Receivable, Net Reported Amount Loans and leases, net Loans and leases, net Other Investment securities Other securities, Amortized Cost Other (fair value: $376,082 at September 30, 2011; $412,709 at December 31, 2010) Line item includes holdings of Federal Home Loan Bank and Federal Reserve Bank stock (at amortized cost). Cash flows from investing activities Cash flows from financing activities Other investments net Other investments, net The net cash inflow (outflow) related to other investments that may include joint ventures and equity investees. Cash flows from operating activities Net Cash Provided by (Used in) Operating Activities Net cash provided by operating activities Adjustments to reconcile net income to net cash provided by operating activities Increase (Decrease) in Loans Held-for-sale Net change in loans originated for sale Net change in loans originated for sale Preferred stock, par value Preferred stock, par value Preferred stock, shares authorized Preferred stock, shares authorized Preferred stock, shares issued Preferred stock, shares issued Preferred stock, shares outstanding Preferred stock, shares outstanding Common stock, par value Common stock, par value Common stock, shares authorized Common stock, shares authorized Common stock, shares issued Common stock, shares issued Treasury stock, shares Asset write-downs Provision for deferred income taxes Total deferred Provision for deferred income taxes Amortization of core deposit and other intangible assets Amortization of core deposit and other intangible assets Amortization of capitalized servicing rights Net Income (Loss) Attributable to Parent Net income Net income Available for sale Proceeds from maturities of investment securities, Available for sale Payments for (Proceeds from) Loans and Leases Net (increase) decrease in loans and leases Net (increase) decrease in loans and leases Net (increase) decrease in loans and leases Capital expenditures, net Payments For Proceeds From Other Investing Activities Other, net Supplemental disclosure of cash flow information Supplemental disclosure of cash flow information Income taxes paid during the period Income Taxes Paid, Net Interest received during the period Interest received during the period Interest received during the period Income Tax Expense (Benefit) Income taxes Other expense Total other expense Noninterest Expense Other expense Total merger-related expenses Other costs of operations Other costs of operations FDIC assessments FDIC assessments Supplies and Postage Expense Printing, postage and supplies Printing, postage and supplies Labor and Related Expense Salaries and employee benefits Salaries and employee benefits Other income Income Other income Noninterest Income Other income Total other income Total income Other revenues from operations Other revenues from operations Gain (Loss) on Sale of Securities, Net Gain on bank investment securities Gain on bank investment securities Trading account and foreign exchange gains Trading account and foreign exchange gains Brokerage services income Brokerage services income Trust income Trust income Service charges on deposit accounts Service charges on deposit accounts Net interest income after provision for credit losses Net interest income Interest expense Total interest expense Interest Expense, Long-term Debt Long-term borrowings Short-term borrowings Deposits at foreign office Deposits at Cayman Islands office Time deposits Interest Expense Savings Deposits Savings deposits Savings deposits Interest Expense Negotiable Order of Withdrawal NOW Deposits NOW accounts NOW accounts Interest income Interest and Dividend Income, Operating Total interest income Net interest income Exempt from federal taxes Exempt from federal taxes Fully taxable Trading account Trading account Federal funds sold Federal funds sold Interest Income, Domestic Deposits Deposits at banks Interest and Fee Income, Loans and Leases Loans and leases, including fees Earnings per common share [Abstract] Earnings Per Share, Diluted Diluted earnings per common share Diluted Earnings Per Share, Basic Basic earnings per common share Basic Weighted Average Number Of Shares Outstanding Basic Weighted-average shares outstanding Basic Weighted Average Number Of Diluted Shares Outstanding Adjusted weighted-average shares outstanding Diluted Increase (Decrease) in Deposits Net increase (decrease) in deposits Net increase in deposits Net decrease in short-term borrowings Repayments of Long-term Debt Payments on long-term borrowings Payments on long-term borrowings Payments on long-term borrowings Dividends paid - common Dividends paid - preferred Proceeds From Payments For Other Financing Activities Other, net Net Cash Provided by (Used in) Financing Activities Net cash used by financing activities Net cash provided (used) by financing activities Cash and Cash Equivalents, Period Increase (Decrease) Net increase (decrease) in cash and cash equivalents Supplemental schedule of noncash investing and financing activities Supplemental schedule of noncash investing and financing activities Assets Total assets Assets Loans And Leases Receivable Allowance Allowance for credit losses Ending balance Beginning balance Allowance for credit losses Cash and Due from Banks Cash and due from banks Interest-bearing deposits at banks Interest-bearing deposits at banks Loans and Leases Receivable, Gross, Carrying Amount Loans and leases Property, Plant and Equipment, Net Premises and equipment Held to maturity (fair value: $431,036 at September 30, 2009; $394,752 at December 31, 2008) Amortized Cost for Held-to-maturity Held to maturity (fair value: $1,097,215 at September 30, 2011; $1,225,253 at December 31, 2010) Deposits Negotiable Order Of Withdrawal NOW NOW accounts Deposits Savings deposits Savings deposits Unearned discount Unearned discount Trading Securities Trading account assets Trading account Equity in earnings of Bayview Lending Group LLC Equity in undistributed income of subsidiaries Income (Loss) from Equity Method Investments, Total Equity in earnings of Bayview Lending Group LLC Comprehensive income: Comprehensive income: Other Comprehensive Income, Defined Benefit Plans Adjustment, Net of Tax Defined benefit plans liability adjustment, net Defined benefit plans liability adjustment Preferred stock cash dividends Preferred stock cash dividends Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest Ending Balance Beginning Balance Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Total Other comprehensive income, net of tax and reclassification adjustments: Other Comprehensive Income (Loss), Net of Tax [Abstract] Cash and Cash Equivalents, at Carrying Value Cash and cash equivalents at end of period Cash and cash equivalents at beginning of period Cash and Cash Equivalents, at Carrying Value, Total Cash and cash equivalents Common Stock Issuable Common stock issuable, 68,107 shares at September 30, 2011; 71,345 shares at December 31, 2010 The obligation to issue shares of Company common stock in connection with deferred compensation plans. Common Stock, Dividends, Per Share, Declared Cash dividend, per share Significant accounting policies Significant Accounting Policies [Text Block] Borrowings Debt Disclosure [Text Block] Pension plans and other postretirement benefits Pension and Other Postretirement Benefits Disclosure [Text Block] Earnings per common share Earnings Per Share [Text Block] Comprehensive income Comprehensive Income Note [Text Block] Fair value measurements Fair Value Disclosures [Text Block] Commitments and contingencies Commitments and Contingencies Disclosure [Text Block] Segment information Segment Reporting Disclosure [Text Block] Real estate acquired in settlement of loans Real estate acquired in settlement of loans Real estate acquired in settlement of loans. Increase (Decrease) Deferred compensation plans net including dividend equivalents Deferred compensation plans, net, including dividend equivalents Deferred compensation plans, net, including dividend equivalents. Amortization of preferred stock discount Amortization of preferred stock discount Amortization of preferred stock discount. Common Stock Issuable [Member] Common stock issuable Common stock issuable. Acquisitions Business Combination Disclosure [Text Block] Relationship with Bayview Lending Group LLC and Bayview Financial Holdings, L.P. [Abstract] Relationship With Other Entities. Relationship With Other Entities [Text Block] Relationship with Bayview Lending Group LLC and Bayview Financial Holdings, L.P. Relationship with other entities. Investment securities Investments in Debt and Marketable Equity Securities (and Certain Trading Assets) Disclosure [Text Block] Pledged securities that can be sold or repledged Securities Held as Collateral, at Fair Value Available-for-sale Securities, Amortized Cost Fair Value and amortized cost of ADSs included into investment securities available for sale Investment securities, available for sale, amortized cost Common Stock Issuable Shares Common stock issuable, shares Number of shares of common stock issuable in connection with deferred Compensation plans. Federal funds sold Federal Funds Sold Time Deposits Time deposits Time deposits Net Cash Provided by (Used in) Investing Activities Net cash provided by investing activities Net cash provided (used) by investing activities Intangible Assets, Net (Excluding Goodwill) Core deposit and other intangible assets Other Assets Accrued interest and other assets Noninterest-bearing Deposit Liabilities, Domestic Noninterest-bearing deposits Noninterest-bearing deposits Other Liabilities Other liabilities Accrued interest and other liabilities Interest Paid Interest paid during the period Time deposits Interest Expense, Time Deposits Short-term borrowings Interest Expense, Short-term Borrowings Net interest income Interest Income (Expense), Net Asset write-downs Asset Impairment Charges Capital expenditures, net Payments for (Proceeds from) Productive Assets Net decrease in short-term borrowings Proceeds from (Repayments of) Short-term Debt Capital expenditures, net Dividends paid - common Dividends paid - preferred Preferred Stock, Liquidation Preference Per Share Liquidation preference Preferred stock, liquidation preference per share Treasury stock - common, shares Treasury Stock, Shares, Beginning Balance Treasury Stock, Shares, Ending Balance Stock Granted During Period, Value, Share-based Compensation Directors' stock plan Net Income (Loss) Available to Common Stockholders, Basic Net income available to common shareholders Basic Repayment of management stock ownership program receivable Repayment of management stock ownership program receivable Repayment of management stock ownership program receivable. Stockholders' Equity Note Disclosure [Text Block] Shareholders' equity Adjustments to Additional Paid in Capital, Share-based Compensation, Requisite Service Period Recognition, Value Compensation expense, net Other Securities Fair Value Other securities, Estimated fair value Other debt securities, fair value Parenthetical disclosure of holdings of Federal Home Loan Bank and Federal Reserve Bank Stock (at fair value). Fully taxable Mortgage Banking Revenues Mortgage banking revenues The noninterest income derived from mortgage banking activities (fees and commissions), including fees earned from servicing third-party assets. Entity Registrant Name Entity Central Index Key Document Type Document Period End Date Amendment Flag Current Fiscal Year End Date Entity Well-known Seasoned Issuer Entity Voluntary Filers Entity Current Reporting Status Entity Filer Category Entity Common Stock, Shares Outstanding Statement [Table] Statement, Equity Component [Table] Statement [Line Items] Assets [Abstract] Goodwill Goodwill Liabilities [Abstract] Federal Funds Purchased and Securities Sold under Agreements to Repurchase Additional Paid in Capital Retained Earnings (Accumulated Deficit) Interest Expense Interest Income (Expense), after Provision for Loan Loss Consolidated Statement of Cash Flows [Abstract] Condensed Statement of Cash Flows Net Cash Provided by (Used in) Operating Activities [Abstract] Adjustments to Reconcile Net Income (Loss) to Cash Provided by (Used in) Operating Activities [Abstract] Net Cash Provided by (Used in) Investing Activities [Abstract] Net Cash Provided by (Used in) Financing Activities [Abstract] Statement, Equity Components [Axis] Equity Component [Domain] Cash flow hedges [Member] Accumulated Defined Benefit Plans Adjustment [Member] Defined benefit plans [Member] Interest income Interest expense Other expense Net income per common share Consolidated Balance Sheet [Abstract] Consolidated Statement of Income [Abstract] Condensed Statement of Income Consolidated Statement of Changes in Shareholders Equity [Abstract] Weighted Average Number of Shares Outstanding, Diluted [Abstract] Adjusted weighted-average shares outstanding: Average common shares outstanding Investment securities Interest and Dividend Income, Securities, by Taxable Status [Abstract] Stock-based compensation plans [Abstract] Stock-based compensation plans: Commitments To Extend Credit [Abstract] Commitments to extend credit Commitments to Extend Credit. Commitments to Extend Credit for Home Equity Lines of Credit Home equity lines of credit Commitments to extend credit for Home equity lines of credit. Commitments to Extend Credit for Commercial Real Estate Loans to be Sold Commercial real estate loans to be sold Commitments to extend credit for Commercial real estate loans to be sold. Commitments to Extend Credit for Other Commercial Real Estate and Construction Other commercial real estate and construction Commitments to extend credit for Other commercial real estate and construction. Commitments to Extend Credit for Residential Real Estate Loans to be Sold Residential real estate loans to be sold Commitments to extend credit for Residential real estate loans to be sold.