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Loans (Impaired Loans) (Details) - USD ($)
$ in Thousands
Sep. 30, 2017
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]    
Recorded Investment of Impaired Loans with No Related Allowance [1] $ 15,777 $ 26,772
Recorded Investment of Impaired Loans with Related Allowance [1] 9,394 7,079
Total Recorded Investment of Impaired Loans [1] 25,171 33,851
Unpaid Principal of Impaired Loans with No Related Allowance 16,024 31,431
Unpaid Principal of Impaired Loans with Related Allowance 13,486 8,125
Total Unpaid Principal of Impaired Loans 29,510 39,556
No Related Allowance on Impaired Loans 0 0
Related Allowance on Impaired Loans 1,145 606
Commercial Mortgages [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment of Impaired Loans with No Related Allowance [1] 776 4,676
Recorded Investment of Impaired Loans with Related Allowance [1] 5,886 5,104
Unpaid Principal of Impaired Loans with No Related Allowance 773 9,019
Unpaid Principal of Impaired Loans with Related Allowance 9,909 6,087
No Related Allowance on Impaired Loans 0 0
Related Allowance on Impaired Loans 933 448
Commercial Construction & Development [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment of Impaired Loans with No Related Allowance [1] 0 0
Recorded Investment of Impaired Loans with Related Allowance [1] 0 0
Unpaid Principal of Impaired Loans with No Related Allowance 0 0
Unpaid Principal of Impaired Loans with Related Allowance 0 0
No Related Allowance on Impaired Loans 0 0
Related Allowance on Impaired Loans 0 0
Commercial & Industrial [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment of Impaired Loans with No Related Allowance [1] 5,077 6,458
Recorded Investment of Impaired Loans with Related Allowance [1] 734 662
Unpaid Principal of Impaired Loans with No Related Allowance 5,183 6,550
Unpaid Principal of Impaired Loans with Related Allowance 775 699
No Related Allowance on Impaired Loans 0 0
Related Allowance on Impaired Loans 48 3
Residential Mortgage [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment of Impaired Loans with No Related Allowance [1] 9,430 14,385
Recorded Investment of Impaired Loans with Related Allowance [1] 2,640 1,285
Unpaid Principal of Impaired Loans with No Related Allowance 9,574 14,569
Unpaid Principal of Impaired Loans with Related Allowance 2,667 1,310
No Related Allowance on Impaired Loans 0 0
Related Allowance on Impaired Loans 157 151
Homeowner Construction [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment of Impaired Loans with No Related Allowance [1] 0 0
Recorded Investment of Impaired Loans with Related Allowance [1] 0 0
Unpaid Principal of Impaired Loans with No Related Allowance 0 0
Unpaid Principal of Impaired Loans with Related Allowance 0 0
No Related Allowance on Impaired Loans 0 0
Related Allowance on Impaired Loans 0 0
Home Equity Lines [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment of Impaired Loans with No Related Allowance [1] 27 0
Recorded Investment of Impaired Loans with Related Allowance [1] 0 0
Unpaid Principal of Impaired Loans with No Related Allowance 27 0
Unpaid Principal of Impaired Loans with Related Allowance 0 0
No Related Allowance on Impaired Loans 0 0
Related Allowance on Impaired Loans 0 0
Home Equity Loans [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment of Impaired Loans with No Related Allowance [1] 453 1,137
Recorded Investment of Impaired Loans with Related Allowance [1] 0 0
Unpaid Principal of Impaired Loans with No Related Allowance 453 1,177
Unpaid Principal of Impaired Loans with Related Allowance 0 0
No Related Allowance on Impaired Loans 0 0
Related Allowance on Impaired Loans 0 0
Other Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
Recorded Investment of Impaired Loans with No Related Allowance [1] 14 116
Recorded Investment of Impaired Loans with Related Allowance [1] 134 28
Unpaid Principal of Impaired Loans with No Related Allowance 14 116
Unpaid Principal of Impaired Loans with Related Allowance 135 29
No Related Allowance on Impaired Loans 0 0
Related Allowance on Impaired Loans 7 4
Commercial [Member]    
Financing Receivable, Impaired [Line Items]    
Total Recorded Investment of Impaired Loans [1] 12,473 16,900
Total Unpaid Principal of Impaired Loans 16,640 22,355
Related Allowance on Impaired Loans 981 451
Residential Real Estate [Member]    
Financing Receivable, Impaired [Line Items]    
Total Recorded Investment of Impaired Loans [1] 12,070 15,670
Total Unpaid Principal of Impaired Loans 12,241 15,879
Related Allowance on Impaired Loans 157 151
Consumer [Member]    
Financing Receivable, Impaired [Line Items]    
Total Recorded Investment of Impaired Loans [1] 628 1,281
Total Unpaid Principal of Impaired Loans 629 1,322
Related Allowance on Impaired Loans $ 7 $ 4
[1] The recorded investment in impaired loans consists of unpaid principal balance, net of charge-offs, interest payments received applied to principal and unamortized deferred loan origination fees and costs. For impaired accruing loans (troubled debt restructurings for which management has concluded that the collectibility of the loan is not in doubt), the recorded investment also includes accrued interest.