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Loans and Servicing (Details 7) (USD $)
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Loans serviced for others      
Unpaid principal balances of mortgage loans serviced for others not included in the accompanying consolidated balance sheets $ 107,500,000   $ 96,800,000
Moving average term of U.S. Treasury rate used to estimate the discount rate in order to determine the fair value of servicing rights (in years) 10 years    
Percentage added to the moving average 10-year U.S. Treasury rate to estimate the discount rate used to determine the fair value of servicing rights 5.00%    
Mortgage servicing rights capitalized and amortized      
Balance at beginning of period 910,000 475,000  
Additions 227,000 80,000  
Amortization (79,000) (42,000)  
Balance at end of period 1,058,000 513,000  
Valuation allowances:      
Balance at beginning of period 20,000 17,000  
Additions   54,000  
Recoveries (15,000)    
Balance at end of period 5,000 71,000  
Mortgage servicing assets, net 1,053,000 442,000  
Fair value of mortgage servicing assets $ 1,403,000 $ 459,000