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Commitments (Details) (USD $)
In Thousands, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Mortgage banking derivative commitments:    
Interest rate lock commitments $ 32,606 $ 65,536
Forward contracts for the future delivery of mortgage loans 14,246 15,731
Forward contracts for the future purchase of mortgage-backed securities 20,000 52,000
Corresponding recorded balances :    
Derivative asset 428 531
Derivative liability 99 199
Reserve for loan repurchases $ 537 $ 430