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Loans (Impaired Loans) (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]      
Recorded Investment of Impaired Loans with No Related Allowance [1] $ 26,772 $ 15,118  
Collateral dependent impaired loans [1] 7,079 17,138  
Total Recorded Investment of Impaired Loans [1] 33,851 32,256  
Unpaid Principal of Impaired Loans with No Related Allowance 31,431 16,399  
Unpaid Principal of Impaired Loans with Related Allowance 8,125 17,493  
Total Unpaid Principal of Impaired Loans 39,556 33,892  
No Related Allowance on Impaired Loans 0 0  
Related Allowance on Impaired Loans 606 2,583  
Average Recorded Investment of Impaired Loans 31,323 24,610 $ 29,792
Interest Income Recognized on Impaired Loans 719 626 899
Commercial Mortgages [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment of Impaired Loans with No Related Allowance [1] 4,676 4,292  
Collateral dependent impaired loans [1] 5,104 10,873  
Unpaid Principal of Impaired Loans with No Related Allowance 9,019 5,101  
Unpaid Principal of Impaired Loans with Related Allowance 6,087 10,855  
No Related Allowance on Impaired Loans 0 0  
Related Allowance on Impaired Loans 448 1,633  
Average Recorded Investment of Impaired Loans 13,201 14,847 22,971
Interest Income Recognized on Impaired Loans 239 327 658
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] 6,458 1,849  
Collateral dependent impaired loans [1] 662 2,024  
Unpaid Principal of Impaired Loans with No Related Allowance 6,550 1,869  
Unpaid Principal of Impaired Loans with Related Allowance 699 2,248  
No Related Allowance on Impaired Loans 0 0  
Related Allowance on Impaired Loans 3 771  
Average Recorded Investment of Impaired Loans 3,540 3,415 2,499
Interest Income Recognized on Impaired Loans 99 130 126
Residential Mortgage [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment of Impaired Loans with No Related Allowance [1] 14,385 8,441  
Collateral dependent impaired loans [1] 1,285 2,895  
Unpaid Principal of Impaired Loans with No Related Allowance 14,569 8,826  
Unpaid Principal of Impaired Loans with Related Allowance 1,310 2,941  
No Related Allowance on Impaired Loans 0 0  
Related Allowance on Impaired Loans 151 156  
Average Recorded Investment of Impaired Loans 12,848 5,423 4,006
Interest Income Recognized on Impaired Loans 322 147 101
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] 0 6  
Collateral dependent impaired loans [1] 0 522  
Unpaid Principal of Impaired Loans with No Related Allowance 0 64  
Unpaid Principal of Impaired Loans with Related Allowance 0 522  
No Related Allowance on Impaired Loans 0 0  
Related Allowance on Impaired Loans 0 2  
Average Recorded Investment of Impaired Loans 354 228 97
Interest Income Recognized on Impaired Loans 10 1 2
Home Equity Loans [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment of Impaired Loans with No Related Allowance [1] 1,137 530  
Collateral dependent impaired loans [1] 0 679  
Unpaid Principal of Impaired Loans with No Related Allowance 1,177 539  
Unpaid Principal of Impaired Loans with Related Allowance 0 783  
No Related Allowance on Impaired Loans 0 0  
Related Allowance on Impaired Loans 0 21  
Average Recorded Investment of Impaired Loans 1,233 487 100
Interest Income Recognized on Impaired Loans 38 11 4
Other Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Recorded Investment of Impaired Loans with No Related Allowance [1] 116 0  
Collateral dependent impaired loans [1] 28 145  
Unpaid Principal of Impaired Loans with No Related Allowance 116 0  
Unpaid Principal of Impaired Loans with Related Allowance 29 144  
No Related Allowance on Impaired Loans 0 0  
Related Allowance on Impaired Loans 4 0  
Average Recorded Investment of Impaired Loans 147 210 119
Interest Income Recognized on Impaired Loans 11 10 $ 8
Commercial [Member]      
Financing Receivable, Impaired [Line Items]      
Total Recorded Investment of Impaired Loans [1] 16,900 19,038  
Total Unpaid Principal of Impaired Loans 22,355 20,073  
Related Allowance on Impaired Loans 451 2,404  
Residential Real Estate [Member]      
Financing Receivable, Impaired [Line Items]      
Total Recorded Investment of Impaired Loans [1] 15,670 11,336  
Total Unpaid Principal of Impaired Loans 15,879 11,767  
Related Allowance on Impaired Loans 151 156  
Consumer [Member]      
Financing Receivable, Impaired [Line Items]      
Total Recorded Investment of Impaired Loans [1] 1,281 1,882  
Total Unpaid Principal of Impaired Loans 1,322 2,052  
Related Allowance on Impaired Loans $ 4 $ 23  
[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 collectability of the loan is not in doubt), the recorded investment also includes accrued interest.