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Mortgage Servicing Rights (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Transfers and Servicing [Abstract]      
Outstanding principal balance of loans serviced for others $ 223,610 $ 214,086  
Net gain from sale of loans 714 496 $ 1,224
Mortgage servicing rights capitalized 487 345  
Amortization of mortgage servicing rights 449 428  
Fair value of mortgage servicing rights $ 1,915 2,088  
Moving average of weekly prepayment data (in months) 3 months    
Anticipated loan prepayment rate of servicing assets (in hundredths) 9.76%    
Period used to determine average quarterly discount rate (in years) 10 years    
Servicing assets and servicing liabilities at fair value, assumptions used to estimate fair value, discount rate adjustment factor (in hundredths) 5.28%    
Summary of mortgage servicing rights [Abstract]      
Mortgage servicing rights $ 5,747 6,039  
Accumulated amortization (4,619) (4,949)  
Impairment reserve (35) (4)  
Mortgage servicing rights, net $ 1,093 $ 1,086