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Mortgage Servicing Rights (Details) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Mortgage Servicing Rights [Abstract]      
Unpaid principal balances of loans serviced for FNMA $ 363,100,000   $ 365,700,000
Summary of the Change in the Balance of Mortgage Service Rights Assets [Roll Forward]      
Beginning balance, at fair value 2,306,000    
Servicing rights that result from transfers of financial assets (217,000) (185,000)  
Changes in fair value [Abstract]      
Ending balance, at fair value 2,396,000    
Mortgage Servicing Rights, Key Economic Assumptions [Abstract]      
Mortgage servicing income 127,000 177,000  
Mortgage Servicing Assets [Member]
     
Summary of the Change in the Balance of Mortgage Service Rights Assets [Roll Forward]      
Beginning balance, at fair value 2,306,000 2,437,000  
Servicing rights that result from transfers of financial assets 217,000 185,000  
Changes in fair value [Abstract]      
Due to changes in model inputs or assumptions 135,000 [1] 384,000 [1]  
Other (262,000) [2] (215,000) [2]  
Ending balance, at fair value $ 2,396,000 $ 2,791,000  
Mortgage Servicing Rights, Key Economic Assumptions [Abstract]      
Prepayment speed (PSA) (in hundredths) 310.00% 272.00%  
Weighted-average life (years) 4 years 6 months 4 years 8 months 12 days  
Yield to maturity discount rate (in hundredths) 10.00% 9.00%  
[1] Represents changes in discount rates and prepayment speed assumptions, which are primarily affected by changes in interest rates
[2] Represents changes due to collection or realization of expected cash flows over time.