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Mortgage Servicing Rights Mortgage Servicing Rights Narrative (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Sep. 30, 2013
Sep. 30, 2012
Dec. 31, 2012
Mortgage Banking [Abstract]          
Prepayment speed     12.36%    
Average quarterly discount rate     10 years    
Discount rate adjustment rate     5.13%    
Origination of Mortgage Servicing Rights (MSRs) $ 139 $ 169 $ 618 $ 250  
Amortization of Mortgage Servicing Rights (MSRs)     391 487  
Mortgage servicing rights 1,852 1,129 1,852 1,129 1,228
Residential mortgage loans serviced for others, principal $ 214,042 $ 215,741 $ 214,042 $ 215,741 $ 205,859