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Disclosures about fair value of assets and liabilities (Details 2) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Hedged loans [Member]
Dec. 31, 2011
Hedged loans [Member]
Dec. 31, 2012
Forward sale commitments [Member]
Dec. 31, 2011
Forward sale commitments [Member]
Dec. 31, 2012
Interest Rate Swap [Member]
Dec. 31, 2011
Interest Rate Swap [Member]
Dec. 31, 2012
Commitments to originate loans [Member]
Dec. 31, 2010
Commitments to originate loans [Member]
Reconciliation of the beginning and ending balances of recurring fair value measurements recognized in the accompanying condensed consolidated balance sheet using significant unobservable (Level 3) inputs                
Beginning balance $ 54,362 $ 50,088 $ 662 $ 407 $ (7,101) $ (3,415)      
Included in net income (74) 147 (152) 255 74 (147) (71)  
Included in other comprehensive income, gross         563 (3,539)    
Purchases, issuances, and settlements 6,114 9,091            
Principal payments (491) (4,964)            
Transfers out to Level 2 (59,911)   (510)   6,464   71  
Ending balance    $ 54,362    $ 662    $ (7,101)