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Derivatives (Narrative) (Details) (USD $)
3 Months Ended 6 Months Ended
Jun. 30, 2011
Jun. 30, 2010
Jun. 30, 2011
Jun. 30, 2010
Dec. 31, 2010
Counterparty default losses on forward contracts $ 0 $ 0 $ 0 $ 0  
Commitments to originate loans held for sale 67,600,000   67,600,000    
Commitments and contingent liabilities          
Changes in fair value of interest rate swap 85,000        
Notional Amount of Credit Risk Derivatives 86,300,000   86,300,000    
Number of Interest Rate Derivatives Held 12   12    
Termination Value Of Derivatives In Net Liability Position 1,400,000   1,400,000    
Minimum Collateral Posting Agreement Amount 1,300,000   1,300,000    
Forward Sales Commitments [Member]
         
Commitments and contingent liabilities $ 106,000,000   $ 106,000,000