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Loans (Impaired Loans) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]      
Recorded Investment of Impaired Loans with No Related Allowance [1] $ 14,626 $ 26,772  
Collateral dependent impaired loans [1] 5,993 7,079  
Total Recorded Investment of Impaired Loans [1] 20,619 33,851  
Unpaid Principal of Impaired Loans with No Related Allowance 14,908 31,431  
Unpaid Principal of Impaired Loans with Related Allowance 10,995 8,125  
Total Unpaid Principal of Impaired Loans 25,903 39,556  
No Related Allowance on Impaired Loans 0 0  
Related Allowance on Impaired Loans 1,129 606  
Average Recorded Investment of Impaired Loans 30,269 31,323 $ 24,610
Interest Income Recognized on Impaired Loans 845 719 626
Commercial Mortgages [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment of Impaired Loans with No Related Allowance [1] 0 4,676  
Collateral dependent impaired loans [1] 4,954 5,104  
Unpaid Principal of Impaired Loans with No Related Allowance 0 9,019  
Unpaid Principal of Impaired Loans with Related Allowance 9,910 6,087  
No Related Allowance on Impaired Loans 0 0  
Related Allowance on Impaired Loans 1,018 448  
Average Recorded Investment of Impaired Loans 8,425 13,201 14,847
Interest Income Recognized on Impaired Loans 79 239 327
Commercial Construction & Development [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment of Impaired Loans with No Related Allowance [1] 0 0  
Collateral dependent impaired loans [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  
Average Recorded Investment of Impaired Loans 0 0 0
Interest Income Recognized on Impaired Loans 0 0 0
Commercial & Industrial [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment of Impaired Loans with No Related Allowance [1] 4,986 6,458  
Collateral dependent impaired loans [1] 191 662  
Unpaid Principal of Impaired Loans with No Related Allowance 5,081 6,550  
Unpaid Principal of Impaired Loans with Related Allowance 212 699  
No Related Allowance on Impaired Loans 0 0  
Related Allowance on Impaired Loans 1 3  
Average Recorded Investment of Impaired Loans 6,445 3,540 3,415
Interest Income Recognized on Impaired Loans 281 99 130
Residential Mortgage [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment of Impaired Loans with No Related Allowance [1] 9,069 14,385  
Collateral dependent impaired loans [1] 715 1,285  
Unpaid Principal of Impaired Loans with No Related Allowance 9,256 14,569  
Unpaid Principal of Impaired Loans with Related Allowance 741 1,310  
No Related Allowance on Impaired Loans 0 0  
Related Allowance on Impaired Loans 104 151  
Average Recorded Investment of Impaired Loans 14,571 12,848 5,423
Interest Income Recognized on Impaired Loans 444 322 147
Homeowner Construction [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment of Impaired Loans with No Related Allowance [1] 0 0  
Collateral dependent impaired loans [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  
Average Recorded Investment of Impaired Loans 0 0 0
Interest Income Recognized on Impaired Loans 0 0 0
Home Equity Lines [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment of Impaired Loans with No Related Allowance [1] 81 0  
Collateral dependent impaired loans [1] 0 0  
Unpaid Principal of Impaired Loans with No Related Allowance 81 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  
Average Recorded Investment of Impaired Loans 79 354 228
Interest Income Recognized on Impaired Loans 7 10 1
Home Equity Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment of Impaired Loans with No Related Allowance [1] 476 1,137  
Collateral dependent impaired loans [1] 0 0  
Unpaid Principal of Impaired Loans with No Related Allowance 476 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  
Average Recorded Investment of Impaired Loans 606 1,233 487
Interest Income Recognized on Impaired Loans 24 38 11
Other Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment of Impaired Loans with No Related Allowance [1] 14 116  
Collateral dependent impaired loans [1] 133 28  
Unpaid Principal of Impaired Loans with No Related Allowance 14 116  
Unpaid Principal of Impaired Loans with Related Allowance 132 29  
No Related Allowance on Impaired Loans 0 0  
Related Allowance on Impaired Loans 6 4  
Average Recorded Investment of Impaired Loans 143 147 210
Interest Income Recognized on Impaired Loans 10 11 $ 10
Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Total Recorded Investment of Impaired Loans [1] 10,131 16,900  
Total Unpaid Principal of Impaired Loans 15,203 22,355  
Related Allowance on Impaired Loans 1,019 451  
Residential Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Total Recorded Investment of Impaired Loans [1] 9,784 15,670  
Total Unpaid Principal of Impaired Loans 9,997 15,879  
Related Allowance on Impaired Loans 104 151  
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Total Recorded Investment of Impaired Loans [1] 704 1,281  
Total Unpaid Principal of Impaired Loans 703 1,322  
Related Allowance on Impaired Loans $ 6 $ 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 accruing impaired loans (troubled debt restructurings for which management has concluded that the collectability of the loan is not in doubt), the recorded investment also includes accrued interest.