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Derivatives (Narrative) (Details) (USD $)	12 Months Ended
Derivatives (Narrative) (Details) (USD $)	Dec. 31, 2012 contract	Dec. 31, 2011	Dec. 31, 2010
Credit Derivatives [Line Items]
Counterparty default losses on forward contracts	$ 0	$ 0	$ 0
Commitments to originate loans held for sale	209,600,000	447,000,000
Commitments and contingent liabilities
Number of interest rate derivatives held	164
Notional amount of credit risk derivatives	912,000,000
Termination value of derivatives in net liability position	21,800,000
Decrease in settlement values of the Bank's derivative assets	(45,000)
Loss on nonhedge derivative instruments related to credit valuation adjustments	336,000		187,000
Interest Rate Forward Sales Commitments [Member]
Credit Derivatives [Line Items]
Commitments and contingent liabilities	446,951,000
Commitments To Originate Loans Held For Sale [Member]
Credit Derivatives [Line Items]
Commitments and contingent liabilities	$ 209,562,000

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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