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Borrowed Funds (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Disclosure of Repurchase Agreements [Abstract]                
Range of repurchase agreements' maturity dates one to 365              
Amount of line of credit with correspondent banks $ 44,000              
Credit facility with Federal Reserve Bank $ 168,000              
Federal Home Loan Bank, Advances, Maturities Summary [Abstract]                
Interest rate, due in year four 1.55%              
Interest rate, due in year five 0.00% 1.55%            
Due in twelve months maturity $ 43,074 $ 74,600            
Due in year two maturity   30,000            
Due in year three maturity 55,000              
Due in year four maturity 10,000 55,000            
Due in year five maturity   10,000            
Due thereafter 50,120 25,127            
Total 158,194 194,727            
Repurchase agreements for municipal and commercial customers 70,564 84,174            
Total $ 228,758 $ 278,901 $ 234,328 $ 282,277 $ 226,467 $ 268,098 $ 283,095 $ 276,531
Minimum                
Disclosure of Repurchase Agreements [Abstract]                
Range of repurchase agreements' maturity dates (days) 1 day              
Federal Home Loan Bank, Advances, Maturities Summary [Abstract]                
Interest rate, due in next twelve months 1.59% 0.99%            
Interest rate, due in year two 2.25%            
Interest rate, due in year three 1.60% 0.00%            
Interest rate, due in year four   1.60%            
Interest rate, due thereafter 0.00% 0.00%            
Interest rate, Repurchase agreements for municipal and commercial customers 0.15% 0.15%            
Maximum                
Disclosure of Repurchase Agreements [Abstract]                
Range of repurchase agreements' maturity dates (days) 365 days              
Federal Home Loan Bank, Advances, Maturities Summary [Abstract]                
Interest rate, due in next twelve months 3.25% 3.69%            
Interest rate, due in year two 3.25%            
Interest rate, due in year three 1.97% 0.00%            
Interest rate, due in year four   1.97%            
Interest rate, due thereafter 0.99% 0.59%            
Interest rate, Repurchase agreements for municipal and commercial customers 1.93% 1.93%