Allowance for Loan Losses (Allowance for Loan Losses by Segment & Impairment Methodology) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	$ 37,493		$ 35,547
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	1,481		2,880
Financing Receivable, Collectively Evaluated for Impairment	2,425,391		2,258,456
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	18,494		19,700
Total loans	2,462,884	[1]	2,294,003	[1]
Financing Receivable, Allowance for Credit Losses	27,886		30,873
Commercial Mortgages [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	30,292		20,250
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	552		1,720
Financing Receivable, Collectively Evaluated for Impairment	765,957		690,563
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	6,417		7,687
Total loans	796,249		710,813
Commercial Construction and Development [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	0		0
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	0		0
Financing Receivable, Collectively Evaluated for Impairment	36,289		27,842
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	362		224
Total loans	36,289		27,842
Commercial Other [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	2,556		10,989
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	463		694
Financing Receivable, Collectively Evaluated for Impairment	528,241		502,775
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	4,970		5,302
Total loans	530,797		513,764
Residential Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	4,290		3,868
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	463		463
Financing Receivable, Collectively Evaluated for Impairment	768,384		713,813
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	4,237		3,806
Consumer Portfolio Segment [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Financing Receivable, Individually Evaluated for Impairment	355		440
Financing Receivable, Allowance for Credit Losses, Individually Evaluated for Impairment	3		3
Financing Receivable, Collectively Evaluated for Impairment	326,520		323,463
Financing Receivable, Allowance for Credit Losses, Collectively Evaluated for Impairment	2,508		2,681
Unallocated [Member]
Financing Receivable, Allowance for Credit Losses [Line Items]
Total loans	0		0
Financing Receivable, Allowance for Credit Losses	$ 7,911		$ 8,293

[1] Includes net unamortized loan origination costs of $879 thousand and $39 thousand, respectively, and net unamortized premiums on purchased loans of $99 thousand and $83 thousand, respectively, at December 31, 2013 and 2012.