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Loans and Allowance for Credit Losses (Troubled Debt Restructurings on Financing Receivables) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
contract
Financing Receivable, Allowance for Credit Losses [Line Items]    
Number of contracts | contract   1
Premodification outstanding recorded investment   $ 760
Postmodification outstanding recorded investment   755
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]    
Related allowance
Commercial Real Estate Portfolio Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Number of contracts | contract   1
Premodification outstanding recorded investment   $ 760
Postmodification outstanding recorded investment   755
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