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Allowance for Loan Losses (Allowance for Loan Losses by Segment & Impairment Methodology) (Details) - USD ($)
$ in Thousands
Sep. 30, 2015
Dec. 31, 2014
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment $ 30,590 $ 22,019
Loans related allowance individually evaluated for impairment 1,817 1,583
Loans collectively evaluated for impairment 2,919,328 2,837,257
Loans related allowance collectively evaluated for impairment 23,512 24,049
Total loans [1] 2,949,918 2,859,276
Allowance 27,161 28,023
Commercial Mortgages [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 15,552 14,991
Loans related allowance individually evaluated for impairment 1,256 927
Loans collectively evaluated for impairment 858,215 828,987
Loans related allowance collectively evaluated for impairment 7,239 7,275
Total loans 873,767 843,978
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 121,857 79,592
Loans related allowance collectively evaluated for impairment 1,689 1,300
Total loans 121,857 79,592
Commercial & Industrial [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 3,218 2,921
Loans related allowance individually evaluated for impairment 186 177
Loans collectively evaluated for impairment 581,012 608,997
Loans related allowance collectively evaluated for impairment 7,167 7,810
Total loans 584,230 611,918
Residential Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 10,146 3,698
Loans related allowance individually evaluated for impairment 312 326
Loans collectively evaluated for impairment 1,014,068 981,717
Loans related allowance collectively evaluated for impairment 5,231 5,104
Consumer Segment [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Loans individually evaluated for impairment 1,674 409
Loans related allowance individually evaluated for impairment 63 153
Loans collectively evaluated for impairment 344,176 337,964
Loans related allowance collectively evaluated for impairment 2,186 2,560
Unallocated [Member]    
Financing Receivable, Allowance for Credit Losses [Line Items]    
Total loans 0 0
Allowance $ 1,832 $ 2,391
[1] Includes net unamortized loan origination costs of $2.7 million and $2.1 million, respectively, and net unamortized premiums on purchased loans of $87 thousand and $94 thousand, respectively, at September 30, 2015 and December 31, 2014.