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Mortgage Servicing Rights Mortgage Servicing Rights Narrative (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Mortgage Banking [Abstract]          
Prepayment speed     16.06%    
Average quarterly discount rate     10 years    
Discount rate adjustment rate     5.09%    
Origination of Mortgage Servicing Rights (MSRs) $ 224 $ 70 $ 479 $ 81  
Amortization of Mortgage Servicing Rights (MSRs)     265 334  
Mortgage servicing rights 1,757 1,075 1,757 1,075 1,228
Residential mortgage loans serviced for others, principal $ 212,106 $ 213,035 $ 212,106 $ 213,035 $ 205,859