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Derivatives (Narrative) (Details) (USD $)	3 Months Ended		9 Months Ended
Derivatives (Narrative) (Details) (USD $)	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010	Dec. 31, 2010
Credit Derivatives [Line Items]
Counterparty default losses on forward contracts	$ 0	$ 0	$ 0	$ 0
Commitments to originate loans held for sale	173,100,000		173,100,000
Commitments and contingent liabilities
Notional amount of credit risk derivatives	135,600,000		135,600,000
Number of interest rate derivatives held	26		26
Termination value of derivatives in net liability position	5,000,000		5,000,000
Minimum collateral posting agreement amount	4,500,000		4,500,000
Forward Sales Commitments [Member]
Credit Derivatives [Line Items]
Commitments and contingent liabilities	$ 201,370,000		$ 201,370,000

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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