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Allowance for Loan Losses (Allowance for Loan Losses by Segment & Impairment Methodology) (Details) - USD ($)
$ in Thousands
Mar. 31, 2016
Dec. 31, 2015
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment $ 28,562 $ 32,226
Loans related allowance individually evaluated for impairment 1,477 2,583
Loans collectively evaluated for impairment 3,018,431 2,980,901
Loans related allowance collectively evaluated for impairment 24,660 24,486
Total loans [1] 3,046,993 3,013,127
Allowance 26,137 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 586 1,633
Loans collectively evaluated for impairment 963,451 916,812
Loans related allowance collectively evaluated for impairment 8,000 7,507
Total loans 976,931 931,953
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 123,032 122,297
Loans related allowance collectively evaluated for impairment 1,643 1,758
Total loans 123,032 122,297
Commercial & Industrial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 3,496 3,871
Loans related allowance individually evaluated for impairment 757 771
Loans collectively evaluated for impairment 595,352 596,426
Loans related allowance collectively evaluated for impairment 7,504 7,431
Total loans 598,848 600,297
Residential Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 10,013 11,333
Loans related allowance individually evaluated for impairment 133 156
Loans collectively evaluated for impairment 994,336 1,002,222
Loans related allowance collectively evaluated for impairment 5,230 5,304
Consumer Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 1,573 1,881
Loans related allowance individually evaluated for impairment 1 23
Loans collectively evaluated for impairment 342,260 343,144
Loans related allowance collectively evaluated for impairment $ 2,283 $ 2,486
[1] Includes net unamortized loan origination costs of $2.6 million at both at March 31, 2016 and December 31, 2015 and net unamortized premiums on purchased loans of $78 thousand and $84 thousand, respectively, at March 31, 2016 and December 31, 2015.