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Allowance for Loan Losses (Allowance for Loan Losses by Segment & Impairment Methodology) (Details) - USD ($)
$ in Thousands
Jun. 30, 2017
Dec. 31, 2016
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment $ 31,795 $ 33,815
Loans related allowance individually evaluated for impairment 1,345 606
Loans collectively evaluated for impairment 3,168,305 3,200,556
Loans related allowance collectively evaluated for impairment 25,317 25,398
Total loans [1] 3,200,100 3,234,371
Allowance 26,662 26,004
Commercial Mortgages [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 8,380 9,776
Loans related allowance individually evaluated for impairment 485 448
Loans collectively evaluated for impairment 1,000,716 1,064,410
Loans related allowance collectively evaluated for impairment 10,250 9,523
Total loans 1,009,096 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 112,177 121,371
Loans related allowance collectively evaluated for impairment 1,200 1,195
Total loans 112,177 121,371
Commercial & Industrial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 6,939 7,098
Loans related allowance individually evaluated for impairment 718 3
Loans collectively evaluated for impairment 570,177 569,011
Loans related allowance collectively evaluated for impairment 6,349 6,989
Total loans 577,116 576,109
Residential Real Estate [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 15,721 15,661
Loans related allowance individually evaluated for impairment 135 151
Loans collectively evaluated for impairment 1,152,384 1,107,087
Loans related allowance collectively evaluated for impairment 5,234 5,101
Consumer [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 755 1,280
Loans related allowance individually evaluated for impairment 7 4
Loans collectively evaluated for impairment 332,851 338,677
Loans related allowance collectively evaluated for impairment $ 2,284 $ 2,590
[1] Includes net unamortized loan origination costs of $3.7 million and $3.0 million, respectively, at June 30, 2017 and December 31, 2016 and net unamortized premiums on purchased loans of $854 thousand and $783 thousand, respectively, at June 30, 2017 and December 31, 2016.