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Borrowings (Narrative) (Details) - USD ($)
 12 Months Ended
Apr. 15, 2015
Dec. 31, 2016
Dec. 31, 2015
Jun. 30, 2015
Short-term Debt [Line Items]        
Short-term borrowings, weighted average rate   0.76% 0.53%  
Short-term borrowings   $ 331,500,000 $ 293,100,000  
Subordinated Notes Due April 15, 2030 [Member]        
Short-term Debt [Line Items]        
Cost related to issuance of debt   1,100,000    
Proceeds from issuance of debt, net   $ 38,900,000    
Principal amount $ 40,000,000     $ 40,000,000
Interest rate 6.00%      
Number of years at stated rate   10 years    
Debt issuance cost amortization period   15 years    
Federal Home Loan Bank Advances [Member]        
Short-term Debt [Line Items]        
Short-term borrowings   $ 331,500,000 293,100,000  
Federal Home Loan Bank Overnight Borrowings [Member]        
Short-term Debt [Line Items]        
Short-term borrowings   171,500,000 116,800,000  
Federal Home Loan Borrowings Short Term Advances [Member]        
Short-term Debt [Line Items]        
Short-term borrowings   $ 160,000,000 $ 176,300,000  
LIBOR [Member] | Subordinated Notes Due April 15, 2030 [Member]        
Short-term Debt [Line Items]        
Spread on variable rate 3.944%