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Off-Balance-Sheet Financial Instruments and Concentrations of Credit Risk (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance-sheet financial instruments $ 133,549 $ 132,945
Unused lines, collateralized by residential real estate    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance-sheet financial instruments 69,244 65,264
Other unused commitments    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance-sheet financial instruments 49,833 49,608
Standby letters of credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance-sheet financial instruments 4,098 4,480
Commitments to extend credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance-sheet financial instruments $ 10,374 $ 13,593