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Loan Servicing (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Originated mortgage servicing rights      
Balances, January 1 $ 5,049 $ 4,175 $ 3,010
Servicing rights capitalized 2,439 1,866 2,000
Amortization of servicing rights (1,319) (992) (835)
Balances, December 31 6,169 5,049 4,175
Impairment allowance      
Balances, January 1 (856) (803) (139)
Additions (762) (792) (776)
Reductions 594 739 112
Balances, December 31 (1,024) (856) (803)
Mortgage servicing rights, net $ 5,145 $ 4,193 $ 3,372