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Loans and Allowance for Credit Losses (Troubled Debt Restructurings on Financing Receivables) (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2017
USD ($)
contract
Sep. 30, 2016
USD ($)
contract
Financing Receivable, Allowance for Credit Losses [Line Items]    
Number of contracts | contract 2 4
Premodification outstanding recorded investment $ 1,222 $ 1,162
Postmodification outstanding recorded investment 1,100 1,194
Related allowance
Commercial and Residential Real Estate Portfolio Segment [Member] | Construction Loans [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Related allowance
Residential Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Number of contracts | contract   3
Premodification outstanding recorded investment   $ 667
Postmodification outstanding recorded investment   699
Related allowance
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Number of contracts | contract 1 1
Premodification outstanding recorded investment $ 760 $ 495
Postmodification outstanding recorded investment 755 495
Related allowance
Commercial Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Number of contracts | contract 1  
Premodification outstanding recorded investment $ 462  
Postmodification outstanding recorded investment 345  
Related allowance
Consumer Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Related allowance