Allowance for Loan Losses (Allowance for Loan Losses by Segment & Impairment Methodology) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for impairment	$ 31,125		$ 37,493
Loans related allowance individually evaluated for impairment	1,027		1,481
Loans collectively evaluated for impairment	2,447,478		2,425,391
Loans related allowance collectively evaluated for impairment	18,642		18,494
Total loans	2,478,603	[1]	2,462,884	[1]
Allowance	27,043		27,886
Commercial Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for impairment	25,089		30,292
Loans related allowance individually evaluated for impairment	292		552
Loans collectively evaluated for impairment	763,747		765,957
Loans related allowance collectively evaluated for impairment	6,255		6,417
Total loans	788,836		796,249
Commercial Construction and 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	24,696		36,289
Loans related allowance collectively evaluated for impairment	269		362
Total loans	24,696		36,289
Commercial Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for impairment	2,186		2,556
Loans related allowance individually evaluated for impairment	297		463
Loans collectively evaluated for impairment	521,565		528,241
Loans related allowance collectively evaluated for impairment	4,904		4,970
Total loans	523,751		530,797
Residential Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for impairment	3,506		4,290
Loans related allowance individually evaluated for impairment	436		463
Loans collectively evaluated for impairment	806,887		768,384
Loans related allowance collectively evaluated for impairment	4,651		4,237
Consumer Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Loans individually evaluated for impairment	344		355
Loans related allowance individually evaluated for impairment	2		3
Loans collectively evaluated for impairment	330,583		326,520
Loans related allowance collectively evaluated for impairment	2,563		2,508
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	0		0
Allowance	$ 7,374		$ 7,911

[1] Includes net unamortized loan origination costs of $1.1 million and $879 thousand, respectively, and net unamortized premiums on purchased loans of $102 thousand and $99 thousand, respectively, at March 31, 2014 and December 31, 2013.