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Borrowed Funds (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Disclosure of Repurchase Agreements [Abstract]                
Range of repurchase agreements' maturity dates one to 365              
Amount of line of credit with correspondent banks $ 46,000              
Credit facility with Federal Reserve Bank $ 84,000              
Federal Home Loan Bank, Advances, Maturities Summary [Abstract]                
Interest rate, due in year three 1.55%              
Interest rate, due in year four   1.55%            
Interest rate, due thereafter 0.00%              
Due in twelve months maturity $ 105,000 $ 43,074            
Due in year two maturity 55,000              
Due in year three maturity 10,000 55,000            
Due in year four maturity   10,000            
Due thereafter 112 50,120            
Total 170,112 158,194            
Repurchase agreements for municipal and commercial customers 40,205 70,564            
Total $ 210,317 $ 228,758 $ 265,274 $ 297,455 $ 244,229 $ 234,328 $ 282,277 $ 226,467
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 2.25% 1.59%            
Interest rate, due in year two 1.60%              
Interest rate, due in year three   1.60%            
Interest rate, due thereafter   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 2.58% 3.25%            
Interest rate, due in year two 1.97%              
Interest rate, due in year three   1.97%            
Interest rate, due thereafter   0.99%            
Interest rate, Repurchase agreements for municipal and commercial customers 2.00% 2.48%