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Borrowed Funds (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Sep. 30, 2016
Jun. 30, 2016
Mar. 31, 2016
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Disclosure of Repurchase Agreements [Abstract]                
Range of repurchase agreements' maturity dates one to 365              
Amount of line of credit with correspondent banks $ 48,000              
Credit facility with Federal Reserve Bank $ 157,000              
Federal Home Loan Bank, Advances, Maturities Summary [Abstract]                
Interest Rate, Due in Year Five 1.55%              
Due in Twelve Months Maturity $ 74,600 $ 135,220            
Due in Year Two Maturity 30,000 30,000            
Due in Year Three Maturity   30,000            
Due in Year Four Maturity 55,000              
Due in Year Five Maturity 10,000 55,000            
Due Thereafter 25,127 134            
Total 194,727 250,354            
Repurchase Agreements for municipal and commercial customers 84,174 87,103            
Total $ 278,901 $ 337,457 $ 268,098 $ 283,095 $ 276,531 $ 297,369 $ 278,013 $ 312,576
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 0.99% 0.41%            
Interest Rate, Due in Year Two 2.25% 0.99%            
Interest Rate, Due in Year Three   2.25%            
Interest Rate, Due in Year Four 1.60%              
Interest Rate, Due in Year Five   1.60%            
Interest Rate, Due Thereafter 0.00% 0.00%            
Securities Sold under Agreements to Repurchase, Stated Rate 0.15% 0.20%            
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 3.69% 2.44%            
Interest Rate, Due in Year Two 3.25% 3.69%            
Interest Rate, Due in Year Three   3.25%            
Interest Rate, Due in Year Four 1.97%              
Interest Rate, Due in Year Five   1.97%            
Interest Rate, Due Thereafter 0.59% 0.00%            
Securities Sold under Agreements to Repurchase, Stated Rate 1.93% 1.89%