Loans (Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013		Mar. 31, 2012	Dec. 31, 2012
Financing Receivable, Impaired [Line Items]
Total Recorded Investment of Impaired Loans	$ 39,311	[1]		$ 35,562	[1]
Total Unpaid Principal of Impaired Loans	41,923			38,658
Related Allowance on Impaired Loans	5,026			2,880
Average Recorded Investment of Impaired Loans	36,069		27,872
Interest Income Recognized on Impaired Loans	194		175
Commercial Segment [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment of Impaired Loans	34,272	[1]		31,251	[1]
Total Unpaid Principal of Impaired Loans	36,424			33,845
Related Allowance on Impaired Loans	4,292			2,414
Residential Segment [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment of Impaired Loans	4,639	[1]		3,870	[1]
Total Unpaid Principal of Impaired Loans	5,028			4,262
Related Allowance on Impaired Loans	701			463
Consumer Segment [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment of Impaired Loans	400	[1]		441	[1]
Total Unpaid Principal of Impaired Loans	471			551
Related Allowance on Impaired Loans	33			3
Class of Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment of Impaired Loans with No Related Allowance	3,576	[1]		4,709	[1]
Recorded Investment of Impaired Loans with Related Allowance	35,735	[1]		30,853	[1]
Unpaid Principal of Impaired Loans with No Related Allowance	3,591			4,732
Unpaid Principal of Impaired Loans with Related Allowance	38,332			33,926
No Related Allowance on Impaired Loans	0			0
Related Allowance on Impaired Loans	5,026			2,880
Commercial Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment of Impaired Loans with No Related Allowance	1,529	[1]		2,357	[1]
Recorded Investment of Impaired Loans with Related Allowance	23,056	[1]		17,897	[1]
Unpaid Principal of Impaired Loans with No Related Allowance	1,531			2,360
Unpaid Principal of Impaired Loans with Related Allowance	24,893			19,738
No Related Allowance on Impaired Loans	0			0
Related Allowance on Impaired Loans	3,609			1,720
Average Recorded Investment of Impaired Loans	20,903		10,991
Interest Income Recognized on Impaired Loans	100		70
Commercial Construction and Development [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment of Impaired Loans with No Related Allowance	0	[1]		0	[1]
Recorded Investment of Impaired Loans with Related Allowance	0	[1]		0	[1]
Unpaid Principal of Impaired Loans with No Related Allowance	0			0
Unpaid Principal of Impaired Loans with Related Allowance	0			0
No Related Allowance on Impaired Loans	0			0
Related Allowance on Impaired Loans	0			0
Average Recorded Investment of Impaired Loans	0		0
Interest Income Recognized on Impaired Loans	0		0
Commercial Other [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment of Impaired Loans with No Related Allowance	1,469	[1]		1,058	[1]
Recorded Investment of Impaired Loans with Related Allowance	8,218	[1]		9,939	[1]
Unpaid Principal of Impaired Loans with No Related Allowance	1,467			1,057
Unpaid Principal of Impaired Loans with Related Allowance	8,533			10,690
No Related Allowance on Impaired Loans	0			0
Related Allowance on Impaired Loans	683			694
Average Recorded Investment of Impaired Loans	10,635		10,841
Interest Income Recognized on Impaired Loans	64		74
Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment of Impaired Loans with No Related Allowance	578	[1]		1,294	[1]
Recorded Investment of Impaired Loans with Related Allowance	4,061	[1]		2,576	[1]
Unpaid Principal of Impaired Loans with No Related Allowance	593			1,315
Unpaid Principal of Impaired Loans with Related Allowance	4,435			2,947
No Related Allowance on Impaired Loans	0			0
Related Allowance on Impaired Loans	701			463
Average Recorded Investment of Impaired Loans	4,000		5,461
Interest Income Recognized on Impaired Loans	22		27
Homeowner Construction [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment of Impaired Loans with No Related Allowance	0	[1]		0	[1]
Recorded Investment of Impaired Loans with Related Allowance	0	[1]		0	[1]
Unpaid Principal of Impaired Loans with No Related Allowance	0			0
Unpaid Principal of Impaired Loans with Related Allowance	0			0
No Related Allowance on Impaired Loans	0			0
Related Allowance on Impaired Loans	0			0
Average Recorded Investment of Impaired Loans			0
Interest Income Recognized on Impaired Loans	0		0
Home Equity Lines [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment of Impaired Loans with No Related Allowance	0	[1]		0	[1]
Recorded Investment of Impaired Loans with Related Allowance	174	[1]		187	[1]
Unpaid Principal of Impaired Loans with No Related Allowance	0			0
Unpaid Principal of Impaired Loans with Related Allowance	174			255
No Related Allowance on Impaired Loans	0			0
Related Allowance on Impaired Loans	1			1
Average Recorded Investment of Impaired Loans	263		243
Interest Income Recognized on Impaired Loans	3		1
Home Equity Loans [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment of Impaired Loans with No Related Allowance	0	[1]		0	[1]
Recorded Investment of Impaired Loans with Related Allowance	61	[1]		117	[1]
Unpaid Principal of Impaired Loans with No Related Allowance	0			0
Unpaid Principal of Impaired Loans with Related Allowance	61			160
No Related Allowance on Impaired Loans	0			0
Related Allowance on Impaired Loans	0			0
Average Recorded Investment of Impaired Loans	105		170
Interest Income Recognized on Impaired Loans	3		1
Other Consumer [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment of Impaired Loans with No Related Allowance	0	[1]		0	[1]
Recorded Investment of Impaired Loans with Related Allowance	165	[1]		137	[1]
Unpaid Principal of Impaired Loans with No Related Allowance	0			0
Unpaid Principal of Impaired Loans with Related Allowance	236			136
No Related Allowance on Impaired Loans	0			0
Related Allowance on Impaired Loans	32			2
Average Recorded Investment of Impaired Loans	163		166
Interest Income Recognized on Impaired Loans	$ 2		$ 2

[1] The recorded investment in impaired loans consists of unpaid principal balance, net of charge-offs, interest payments received applied to principal and unamortized deferred loan origination fees and costs. For impaired accruing loans (troubled debt restructurings for which management has concluded that the collectibility of the loan is not in doubt), the recorded investment also includes accrued interest.