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Loans and Allowance for Credit Losses (Troubled Debt Restructurings With Subsequent Default) (Details)
$ in Thousands
6 Months Ended
Jun. 30, 2017
USD ($)
contract
Jun. 30, 2016
USD ($)
contract
Financing Receivable, Allowance for Credit Losses [Line Items]    
Number of contracts | contract 1 3
Recorded investment $ 89 $ 616
Related allowance
Residential Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Number of contracts | contract 1  
Recorded investment $ 89  
Related allowance
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Number of contracts | contract   2
Recorded investment   $ 375
Related allowance
Commercial Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Related allowance
Consumer Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Related allowance
Construction Loans [Member] | Commercial and Residential Real Estate Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Number of contracts | contract   1
Recorded investment   $ 241
Related allowance