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Borrowed Funds (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Sep. 30, 2015
Jun. 30, 2015
Mar. 31, 2015
Sep. 30, 2014
Jun. 30, 2014
Mar. 31, 2014
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 141,000              
Federal Home Loan Bank, Advances, Maturities Summary [Abstract]                
Due in Twelve Months Maturity 135,220 $ 115,050            
Due in Year Two Maturity 30,000 30,000            
Due in Year Three Maturity 30,000 30,000            
Due in Year Four Maturity 0 30,000            
Due in Year Five Maturity 55,000 0            
Due Thereafter 134 141            
Total 250,354 205,191            
Repurchase Agreements for municipal and commercial customers 87,103 74,725            
Total $ 337,457 $ 279,916 $ 297,369 $ 278,013 $ 312,576 $ 258,636 $ 298,520 $ 253,519
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 0.41% 0.22%            
Interest Rate, Due in Year Two 0.99% 2.36%            
Interest Rate, Due in Year Three 2.25% 0.99%            
Interest Rate, Due in Year Four 0.00% 2.25%            
Interest Rate, Due in Year Five 1.60% 0.00%            
Interest Rate, Due Thereafter 0.00% 0.00%            
Securities Sold under Agreements to Repurchase, Stated Rate 0.20% 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 2.44% 2.98%            
Interest Rate, Due in Year Two 3.69% 2.44%            
Interest Rate, Due in Year Three 3.25% 3.69%            
Interest Rate, Due in Year Four 0.00% 3.25%            
Interest Rate, Due in Year Five 1.97% 0.00%            
Interest Rate, Due Thereafter 0.00% 0.00%            
Securities Sold under Agreements to Repurchase, Stated Rate 1.89% 1.89%