Allowance for Loan Losses, Nonperforming Assets and Impaired Loans, Troubled Debt Restructurings (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011
Financing Receivable Modifications [Abstract]
Number of Contracts	10		16	[1]
Pre-Modification Outstanding Principal Balance	$ 1,826		$ 4,120	[1]
Post-Modification Outstanding Principal Balance	1,736	[2]	3,052	[1],[2]
Impairment Accrued	210		765	[1]
Financing Receivable Modifications Subsequent Default [Abstract]
Number of Contracts	5		12	[1]
Principal balance	1,426		2,852	[1]
Impairment Accrued	167		698	[1]
Number of unsecured and fully accrued loans in allowance for loan losses			1
Number of days delay beyond which restructured loans are secured by real estate, minimum (in days)	90 days
Commercial and Industrial [Member]
Financing Receivable Modifications [Abstract]
Number of Contracts			1	[1]
Pre-Modification Outstanding Principal Balance			50	[1]
Post-Modification Outstanding Principal Balance			50	[1],[2]
Impairment Accrued			50	[1]
Financing Receivable Modifications Subsequent Default [Abstract]
Number of Contracts			1	[1]
Principal balance			50	[1]
Impairment Accrued			50	[1]
Consumer Real Estate [Member]
Financing Receivable Modifications [Abstract]
Amounts of partial charge offs included in troubled debt restructurings	109		1,143
Number of loans that received partial charge-offs	2
Number of loans modified and reported as trouble debt restructurings			5
Number of loans with payment relief	4
Consumer Real Estate [Member] | Closed-end First Liens [Member]
Financing Receivable Modifications [Abstract]
Number of Contracts	5
Pre-Modification Outstanding Principal Balance	389
Post-Modification Outstanding Principal Balance	348	[2]
Impairment Accrued	43
Financing Receivable Modifications Subsequent Default [Abstract]
Number of Contracts	1
Principal balance	96
Impairment Accrued	0
Consumer Real Estate [Member] | Closed-end Junior Liens [Member]
Financing Receivable Modifications [Abstract]
Number of Contracts	1
Pre-Modification Outstanding Principal Balance	147
Post-Modification Outstanding Principal Balance	93	[2]
Impairment Accrued	0
Financing Receivable Modifications Subsequent Default [Abstract]
Number of Contracts	1
Principal balance	81
Impairment Accrued	0
Consumer Real Estate [Member] | Closed end Consumer Real Estate [Member]
Financing Receivable Modifications [Abstract]
Number of Contracts			2	[1]
Pre-Modification Outstanding Principal Balance			290	[1]
Post-Modification Outstanding Principal Balance			92	[1],[2]
Impairment Accrued			0	[1]
Financing Receivable Modifications Subsequent Default [Abstract]
Number of Contracts			2	[1]
Principal balance			92	[1]
Impairment Accrued			0	[1]
Consumer Non Real Estate [Member] | Commercial and Industrial [Member]
Financing Receivable Modifications Subsequent Default [Abstract]
Number of Contracts	1
Principal balance	388
Impairment Accrued	167
Commercial Real Estate [Member] | Commercial Real Estate, Owner Occupied [Member]
Financing Receivable Modifications [Abstract]
Number of Contracts	3
Pre-Modification Outstanding Principal Balance	890
Post-Modification Outstanding Principal Balance	895	[2]
Impairment Accrued	0
Financing Receivable Modifications Subsequent Default [Abstract]
Number of Contracts	2
Principal balance	861
Impairment Accrued	0
Commercial Real Estate [Member] | College Housing [Member]
Financing Receivable Modifications [Abstract]
Number of Contracts			2	[1]
Pre-Modification Outstanding Principal Balance			419	[1]
Post-Modification Outstanding Principal Balance			332	[1],[2]
Impairment Accrued			0	[1]
Financing Receivable Modifications Subsequent Default [Abstract]
Number of Contracts			1	[1]
Principal balance			250	[1]
Impairment Accrued			0	[1]
Commercial Real Estate [Member] | Medical Professionals [Member]
Financing Receivable Modifications [Abstract]
Number of Contracts			3	[1]
Pre-Modification Outstanding Principal Balance			79	[1]
Post-Modification Outstanding Principal Balance			79	[1],[2]
Impairment Accrued			66	[1]
Commercial Real Estate [Member] | Other Commercial Real Estate [Member]
Financing Receivable Modifications [Abstract]
Number of Contracts			3	[1]
Pre-Modification Outstanding Principal Balance			680	[1]
Post-Modification Outstanding Principal Balance			726	[1],[2]
Impairment Accrued			474	[1]
Financing Receivable Modifications Subsequent Default [Abstract]
Number of Contracts			3	[1]
Principal balance			687	[1]
Impairment Accrued			474	[1]
Commercial Real Estate [Member] | General Contractors [Member]
Financing Receivable Modifications [Abstract]
Number of Contracts			2	[1]
Pre-Modification Outstanding Principal Balance			128	[1]
Post-Modification Outstanding Principal Balance			128	[1],[2]
Impairment Accrued			128	[1]
Financing Receivable Modifications Subsequent Default [Abstract]
Number of Contracts			2	[1]
Principal balance			128	[1]
Impairment Accrued			128	[1]
Commercial Non Real Estate [Member] | Commercial and Industrial [Member]
Financing Receivable Modifications [Abstract]
Number of Contracts	1
Pre-Modification Outstanding Principal Balance	400
Post-Modification Outstanding Principal Balance	400	[2]
Impairment Accrued	167
Construction Development and Other land [Member]
Financing Receivable Modifications [Abstract]
Amounts of partial charge offs included in troubled debt restructurings			789
Number of loans that received partial charge-offs			1
Construction Development and Other land [Member] | Residential [Member]
Financing Receivable Modifications [Abstract]
Number of Contracts			3	[1]
Pre-Modification Outstanding Principal Balance			2,474	[1]
Post-Modification Outstanding Principal Balance			1,645	[1],[2]
Impairment Accrued			47	[1]
Financing Receivable Modifications Subsequent Default [Abstract]
Number of Contracts			3	[1]
Principal balance			1,645	[1]
Impairment Accrued			$ 46	[1]

[1] Segments and classes at December 31, 2011 are reported using the segmentation method in effect for 2011. The Company began reporting under revised segments beginning in 2012.

[2] Post-modification outstanding recorded investment considers amounts immediately following the modification. Amounts do not reflect balances at the end of the period.