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Troubled Debt Restructurings (Narrative) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2017
USD ($)
contract
Dec. 31, 2016
USD ($)
contract
Dec. 31, 2015
contract
Financing Receivable, Modifications [Line Items]      
Number of troubled debt restructured loans 21 26  
Total troubled debt restructured loans | $ $ 4.4 $ 7.3  
Number of contracts in nonaccrual status 1 6  
Total of loans in nonaccrual status | $ $ 0.0 $ 1.6  
Number of contracts 1 5 3
Loan is considered payment default 30 days    
Consumer Installment [Member]      
Financing Receivable, Modifications [Line Items]      
Number of contracts 1    
Number of contracts modified by changing the amortization period and lowering the interest rate 1    
Residential Single Family [Member]      
Financing Receivable, Modifications [Line Items]      
Number of contracts modified by changing the amortization period     2
Number of contracts modified by reducing the payment amount   2  
Number of contracts modified by changing payments to interest only   1  
Number of contracts modified by changing the amortization period and lowering the interest rate   1 1
Commercial Real Estate Non-Owner Occupied [Member]      
Financing Receivable, Modifications [Line Items]      
Number of contracts   1  
Number of contracts modified by changing the amortization period and lowering the interest rate   1