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Mortgage Servicing Rights (Details) (USD $)
 3 Months Ended 9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2012
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2011
Mortgage Servicing Rights [Abstract]            
Moving average of weekly prepayment data (in months)     3M      
Anticipated loan prepayment rate of servicing assets (in hundredths)     25.80%      
Period used to determine average quarterly discount rate (in years)     10Y      
Servicing assets and servicing liabilities at fair value, assumptions used to estimate fair value, discount rate adjustment factor (in hundredths)     4.89%      
Mortgage servicing rights capitalized $ 169,000 $ 80,000 $ 250,000 $ 343,000    
Amortization of mortgage servicing rights     487,000   399,000  
Fair value of mortgage servicing rights 1,129,000 1,541,000 1,129,000 1,541,000   1,581,000
Outstanding principal balance of loans serviced for others 215,741,000 255,384,000 215,741,000 255,384,000   238,221,000
Summary of mortgage servicing rights [Abstract]            
Mortgage servicing rights 6,346,000 6,067,000 6,346,000 6,067,000   6,099,000
Accumulated amortization (5,324,000) (4,661,000) (5,324,000) (4,661,000)   (4,837,000)
Impairment reserve (154,000) (211,000) (154,000) (211,000)   (61,000)
Mortgage servicing rights $ 868,000 $ 1,195,000 $ 868,000 $ 1,195,000   $ 1,201,000