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Allowance for Loan Losses (Allowance for Loan Losses by Segment & Impairment Methodology) (Details) - USD ($)
$ in Thousands
Jun. 30, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment $ 31,516 $ 32,226
Loans related allowance individually evaluated for impairment 1,011 2,583
Loans collectively evaluated for impairment 3,049,368 2,980,901
Loans related allowance collectively evaluated for impairment 24,815 24,486
Total loans [1] 3,080,884 3,013,127
Allowance 25,826 27,069
Commercial Mortgages [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 13,480 15,141
Loans related allowance individually evaluated for impairment 714 1,633
Loans collectively evaluated for impairment 1,061,267 916,812
Loans related allowance collectively evaluated for impairment 9,699 7,507
Total loans 1,074,747 931,953
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 81,812 122,297
Loans related allowance collectively evaluated for impairment 904 1,758
Total loans 81,812 122,297
Commercial & Industrial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 2,006 3,871
Loans related allowance individually evaluated for impairment 23 771
Loans collectively evaluated for impairment 573,655 596,426
Loans related allowance collectively evaluated for impairment 6,497 7,431
Total loans 575,661 600,297
Residential Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 14,338 11,333
Loans related allowance individually evaluated for impairment 223 156
Loans collectively evaluated for impairment 990,698 1,002,222
Loans related allowance collectively evaluated for impairment 5,246 5,304
Consumer Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 1,692 1,881
Loans related allowance individually evaluated for impairment 51 23
Loans collectively evaluated for impairment 341,936 343,144
Loans related allowance collectively evaluated for impairment $ 2,469 $ 2,486
[1] Includes net unamortized loan origination costs of $2.6 million at both June 30, 2016 and December 31, 2015 and net unamortized premiums on purchased loans of $171 thousand and $84 thousand, respectively, at June 30, 2016 and December 31, 2015.