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Allowance for Loan Losses (Allowance for Loan Losses by Segment & Impairment Methodology) (Details) - USD ($)
$ in Thousands
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment $ 33,815 $ 32,226
Loans related allowance individually evaluated for impairment 606 2,583
Loans collectively evaluated for impairment 3,200,556 2,980,901
Loans related allowance collectively evaluated for impairment 25,398 24,486
Total loans [1] 3,234,371 3,013,127
Allowance 26,004 27,069
Commercial Mortgages [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 9,776 15,141
Loans related allowance individually evaluated for impairment 448 1,633
Loans collectively evaluated for impairment 1,064,410 916,812
Loans related allowance collectively evaluated for impairment 9,523 7,507
Total loans 1,074,186 931,953
Commercial Construction & Development [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 0 0
Loans related allowance individually evaluated for impairment 0 0
Loans collectively evaluated for impairment 121,371 122,297
Loans related allowance collectively evaluated for impairment 1,195 1,758
Total loans 121,371 122,297
Commercial & Industrial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 7,098 3,871
Loans related allowance individually evaluated for impairment 3 771
Loans collectively evaluated for impairment 569,011 596,426
Loans related allowance collectively evaluated for impairment 6,989 7,431
Total loans 576,109 600,297
Residential Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 15,661 11,333
Loans related allowance individually evaluated for impairment 151 156
Loans collectively evaluated for impairment 1,107,087 1,002,222
Loans related allowance collectively evaluated for impairment 5,101 5,304
Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 1,280 1,881
Loans related allowance individually evaluated for impairment 4 23
Loans collectively evaluated for impairment 338,677 343,144
Loans related allowance collectively evaluated for impairment $ 2,590 $ 2,486
[1] Includes net unamortized loan origination costs of $3.0 million and $2.6 million, respectively, and net unamortized premiums on purchased loans of $783 thousand and $84 thousand, respectively, at December 31, 2016 and 2015.