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Derivatives (Narrative) (Details) (USD $)	3 Months Ended		6 Months Ended
Derivatives (Narrative) (Details) (USD $)	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Credit Derivatives [Line Items]
Counterparty default losses on forward contracts	$ 0	$ 0	$ 0	$ 0
Commitments and contingent liabilities
Number of interest rate derivatives held	114		114
Notional amount of credit risk derivatives	610,400,000		610,400,000
Termination value of derivatives in net liability position	17,700,000		17,700,000
Minimum collateral posting agreement amount	18,100,000		18,100,000
Increase in settlement values of the Bank's derivative assets	415,000		415,000
Gain (loss) on nonhedge derivative instruments related to credit valuation adjustments	(700,000)	85,000	(116,000)	85,000
Interest Rate Forward Sales Commitments [Member]
Credit Derivatives [Line Items]
Commitments and contingent liabilities	372,696,000		372,696,000
Commitments To Originate Loans Held For Sale [Member]
Credit Derivatives [Line Items]
Commitments and contingent liabilities	$ 261,900,000		$ 261,900,000

Represents the caption on the face of the balance sheet to indicate that the entity has entered into (1) purchase or supply arrangements that will require expending a portion of its resources to meet the terms thereof, and (2) is exposed to potential losses or, less frequently, gains, arising from (a) possible claims against a company's resources due to future performance under contract terms, and (b) possible losses or likely gains from uncertainties that will ultimately be resolved when one or more future events that are deemed likely to occur do occur or fail to occur.

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