Allowance for Loan Losses, Nonperforming Assets and Impaired Loans, Troubled Debt Restructurings (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended			9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011		Sep. 30, 2012	Sep. 30, 2011
Financing Receivable Modifications [Abstract]
Number of Contracts	2	4	[1]	10	14	[1]
Pre-Modification Outstanding Principal Balance	$ 231	$ 2,920	[1]	$ 1,816	$ 4,078	[1]
Post-Modification Outstanding Principal Balance	231	2,820	[1]	1,844	3,880	[1]
Troubled debt restructuring total amount of unpaid principal balance to date	4,275	8,605		4,275	8,605
Trouble debt restructuring financiing receivable amount of specific allocations to date	284	1,372		284	1,372
Financing Receivable Modifications Subsequent Default [Abstract]
Number of Contracts	4	3		4	7
Principal Balance	1,041	520		1,041	1,320
Number of days delay beyond which restructured loans are secured by real estate, minimum (in days)				90 days
Consumer Real Estate [Member] | Closed-end first liens [Member]
Financing Receivable Modifications [Abstract]
Number of Contracts	1			5
Pre-Modification Outstanding Principal Balance	38			383
Post-Modification Outstanding Principal Balance	38			402
Financing Receivable Modifications Subsequent Default [Abstract]
Number of Contracts	1			1
Principal Balance	96			96
Consumer Real Estate [Member] | Closed end Consumer Real Estate [Member]
Financing Receivable Modifications [Abstract]
Number of Contracts					1	[1]
Pre-Modification Outstanding Principal Balance					75	[1]
Post-Modification Outstanding Principal Balance					75	[1]
Consumer Real Estate [Member] | Closed-end junior liens [Member]
Financing Receivable Modifications [Abstract]
Number of Contracts				1
Pre-Modification Outstanding Principal Balance				143
Post-Modification Outstanding Principal Balance				147
Financing Receivable Modifications Subsequent Default [Abstract]
Number of Contracts	1			1
Principal Balance	84			84
Consumer Real Estate [Member] | 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]
Construction Development and Other land [Member] | Residential [Member]
Financing Receivable Modifications [Abstract]
Number of Contracts		1	[1]		2	[1]
Pre-Modification Outstanding Principal Balance		2,400	[1]		2,634	[1]
Post-Modification Outstanding Principal Balance		2,300	[1]		2,534	[1]
Financing Receivable Modifications Subsequent Default [Abstract]
Number of Contracts		0			1
Principal Balance		0			234
Commercial Real Estate [Member]
Financing Receivable Modifications [Abstract]
Partial charge-off on loans				109
Commercial Real Estate [Member] | Medical Professionals [Member]
Financing Receivable Modifications [Abstract]
Number of Contracts					3	[1]
Pre-Modification Outstanding Principal Balance					73	[1]
Post-Modification Outstanding Principal Balance					73	[1]
Commercial Real Estate [Member] | College Housing [Member]
Financing Receivable Modifications [Abstract]
Number of Contracts					2	[1]
Pre-Modification Outstanding Principal Balance					422	[1]
Post-Modification Outstanding Principal Balance					332	[1]
Financing Receivable Modifications Subsequent Default [Abstract]
Number of Contracts		0			1
Principal Balance		0			255
Commercial Real Estate [Member] | Commercial real estate, other [Member]
Financing Receivable Modifications [Abstract]
Number of Contracts		1	[1]		3	[1]
Pre-Modification Outstanding Principal Balance		392	[1]		696	[1]
Post-Modification Outstanding Principal Balance		392	[1]		688	[1]
Financing Receivable Modifications Subsequent Default [Abstract]
Number of Contracts		1			3
Principal Balance		392			700
Commercial Real Estate [Member] | General Contractors [Member]
Financing Receivable Modifications [Abstract]
Number of Contracts		2	[1]		2	[1]
Pre-Modification Outstanding Principal Balance		128	[1]		128	[1]
Post-Modification Outstanding Principal Balance		128	[1]		128	[1]
Financing Receivable Modifications Subsequent Default [Abstract]
Number of Contracts		2			2
Principal Balance		128			131
Commercial Real Estate [Member] | Commercial real estate, owner occupied [Member]
Financing Receivable Modifications [Abstract]
Number of Contracts	1			3
Pre-Modification Outstanding Principal Balance	193			890
Post-Modification Outstanding Principal Balance	193			895
Financing Receivable Modifications Subsequent Default [Abstract]
Number of Contracts	2			2
Principal Balance	861			861
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

[1] Segments at September 30, 2011 are reported using the segmentation method in effect for 2011. The Company began reporting under revised segments beginning in 2012.