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Off-Balance Sheet Activities (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Loan repurchase requirement, number of days past due 90 days  
Loan repurchase requirement, number of days following sale 180 days  
Commitments to extend credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet financial instruments outstanding $ 345,803 $ 301,360
Standby letters of credit    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet financial instruments outstanding 4,088 4,286
Mortgage loan rate lock commitments    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet financial instruments outstanding 12,839 $ 5,365
Loans held for sale    
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]    
Off-balance sheet financial instruments outstanding $ 5,996