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Allowance for Loan Losses (Allowance for Loan Losses by Segment & Impairment Methodology) (Details) - USD ($)
$ in Thousands
Dec. 31, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment $ 20,598 $ 33,815
Loans related allowance individually evaluated for impairment 1,129 606
Loans collectively evaluated for impairment 3,353,473 3,200,556
Loans related allowance collectively evaluated for impairment 25,359 25,398
Total loans [1] 3,374,071 3,234,371
Allowance 26,488 26,004
Commercial Mortgages [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 4,954 9,776
Loans related allowance individually evaluated for impairment 1,018 448
Loans collectively evaluated for impairment 1,067,533 1,064,410
Loans related allowance collectively evaluated for impairment 10,628 9,523
Total loans 1,072,487 1,074,186
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 138,008 121,371
Loans related allowance collectively evaluated for impairment 1,083 1,195
Total loans 138,008 121,371
Commercial & Industrial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 5,157 7,098
Loans related allowance individually evaluated for impairment 1 3
Loans collectively evaluated for impairment 607,177 569,011
Loans related allowance collectively evaluated for impairment 5,579 6,989
Total loans 612,334 576,109
Residential Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 9,783 15,661
Loans related allowance individually evaluated for impairment 104 151
Loans collectively evaluated for impairment 1,217,465 1,107,087
Loans related allowance collectively evaluated for impairment 5,323 5,101
Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 704 1,280
Loans related allowance individually evaluated for impairment 6 4
Loans collectively evaluated for impairment 323,290 338,677
Loans related allowance collectively evaluated for impairment $ 2,746 $ 2,590
[1] Includes net unamortized loan origination costs of $3.8 million and $3.0 million, respectively, and net unamortized premiums on purchased loans of $878 thousand and $783 thousand, respectively, at December 31, 2017 and 2016.