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Mortgage Servicing Rights (Details) (USD $)
 3 Months Ended 6 Months Ended
Jun. 30, 2012
Jun. 30, 2011
Jun. 30, 2012
Jun. 30, 2011
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)     27.93%    
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)     4.84%    
Mortgage servicing rights capitalized $ 70,000 $ 65,000 $ 81,000 $ 263,000  
Amortization of mortgage servicing rights     334,000 275,000  
Fair value of mortgage servicing rights 1,075,000 1,962,000 1,075,000 1,962,000 1,581,000
Outstanding principal balance of loans serviced for others 213,035,000 253,401,000 213,035,000 253,401,000 238,221,000
Summary of mortgage servicing rights [Abstract]          
Mortgage servicing rights 6,177,000 5,987,000 6,177,000 5,987,000 6,099,000
Accumulated amortization (5,170,000) (4,537,000) (5,170,000) (4,537,000) (4,837,000)
Impairment reserve (177,000) (58,000) (177,000) (58,000) (61,000)
Mortgage servicing rights $ 830,000 $ 1,392,000 $ 830,000 $ 1,392,000 $ 1,201,000