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Disclosures about fair value of assets and liabilities (Details 2) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
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          
Included in net income     $ (408) $ 280  
Hedged 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 54,362
Included in net income (1,444) 298 (1,846) 224 (74)
Purchases, issuances, and settlements         6,114
Principal payments         (491)
Transfers out to Level 2         (59,911)
Ending balance           
Forward sale commitments [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       662 662
Included in net income         (152)
Transfers out to Level 2         (510)
Ending balance           
Interest rate swap agreements [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       (7,101) (7,101)
Included in net income         74
Included in other comprehensive income, gross         563
Transfers out to Level 2         6,464
Ending balance           
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            
Included in net income         (71)
Transfers out to Level 2         71
Ending balance