Loans (Impaired Loans) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Financing Receivable, Impaired [Line Items]
Total Recorded Investment of Impaired Loans	$ 35,562	[1]	$ 29,079	[1]
Total Unpaid Principal of Impaired Loans	38,658		32,558
Related Allowance on Impaired Loans	2,880		1,815
Average Recorded Investment of Impaired Loans	26,551		29,544		31,900
Interest Income Recognized on Impaired Loans	679		1,152		1,400
Accrued Income Receivable [Member]
Financing Receivable, Impaired [Line Items]
Accrued interest on accruing TDRs	13		46
Commercial Segment [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment of Impaired Loans	31,251	[1]	22,477	[1]
Total Unpaid Principal of Impaired Loans	33,845		25,196
Related Allowance on Impaired Loans	2,414		1,168
Residential Segment [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment of Impaired Loans	3,870	[1]	5,989	[1]
Total Unpaid Principal of Impaired Loans	4,262		6,609
Related Allowance on Impaired Loans	463		495
Consumer Segment [Member]
Financing Receivable, Impaired [Line Items]
Total Recorded Investment of Impaired Loans	441	[1]	613	[1]
Total Unpaid Principal of Impaired Loans	551		753
Related Allowance on Impaired Loans	3		152
Class of Financing Receivable [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment of Impaired Loans with No Related Allowance	4,709	[1]	11,098	[1]
Recorded Investment of Impaired Loans with Related Allowance	30,853	[1]	17,981	[1]
Unpaid Principal of Impaired Loans with No Related Allowance	4,732		11,167
Unpaid Principal of Impaired Loans with Related Allowance	33,926		21,391
No Related Allowance on Impaired Loans	0		0
Related Allowance on Impaired Loans	2,880		1,815
Commercial Mortgages [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment of Impaired Loans with No Related Allowance	2,357	[1]	7,093	[1]
Recorded Investment of Impaired Loans with Related Allowance	17,897	[1]	5,023	[1]
Unpaid Principal of Impaired Loans with No Related Allowance	2,360		7,076
Unpaid Principal of Impaired Loans with Related Allowance	19,738		6,760
No Related Allowance on Impaired Loans	0		0
Related Allowance on Impaired Loans	1,720		329
Average Recorded Investment of Impaired Loans	10,785		14,923
Interest Income Recognized on Impaired Loans	273		539
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	1,058	[1]	1,622	[1]
Recorded Investment of Impaired Loans with Related Allowance	9,939	[1]	8,739	[1]
Unpaid Principal of Impaired Loans with No Related Allowance	1,057		1,620
Unpaid Principal of Impaired Loans with Related Allowance	10,690		9,740
No Related Allowance on Impaired Loans	0		0
Related Allowance on Impaired Loans	694		839
Average Recorded Investment of Impaired Loans	10,661		8,226
Interest Income Recognized on Impaired Loans	297		388
Residential Mortgage [Member]
Financing Receivable, Impaired [Line Items]
Recorded Investment of Impaired Loans with No Related Allowance	1,294	[1]	2,383	[1]
Recorded Investment of Impaired Loans with Related Allowance	2,576	[1]	3,606	[1]
Unpaid Principal of Impaired Loans with No Related Allowance	1,315		2,471
Unpaid Principal of Impaired Loans with Related Allowance	2,947		4,138
No Related Allowance on Impaired Loans	0		0
Related Allowance on Impaired Loans	463		495
Average Recorded Investment of Impaired Loans	4,651		5,743
Interest Income Recognized on Impaired Loans	88		188
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		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	187	[1]	278	[1]
Unpaid Principal of Impaired Loans with No Related Allowance	0		0
Unpaid Principal of Impaired Loans with Related Allowance	255		373
No Related Allowance on Impaired Loans	0		0
Related Allowance on Impaired Loans	1		82
Average Recorded Investment of Impaired Loans	172		127
Interest Income Recognized on Impaired Loans	3		5
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	117	[1]	130	[1]
Unpaid Principal of Impaired Loans with No Related Allowance	0		0
Unpaid Principal of Impaired Loans with Related Allowance	160		153
No Related Allowance on Impaired Loans	0		0
Related Allowance on Impaired Loans	0		1
Average Recorded Investment of Impaired Loans	131		290
Interest Income Recognized on Impaired Loans	7		17
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	137	[1]	205	[1]
Unpaid Principal of Impaired Loans with No Related Allowance	0		0
Unpaid Principal of Impaired Loans with Related Allowance	136		227
No Related Allowance on Impaired Loans	0		0
Related Allowance on Impaired Loans	2		69
Average Recorded Investment of Impaired Loans	151		235
Interest Income Recognized on Impaired Loans	$ 11		$ 15

[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 (those 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. As of December 31, 2012 and December 31, 2011, recorded investment in impaired loans included accrued interest of $13 thousand and $46 thousand, respectively.