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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

The amount of the loan's contractually required payments receivable in excess of the amount of its cash flows expected to be collected. This relates to loans with deteriorating of credit quality since origination that were acquired by completion of a transfer for which it is probable, at acquisition, that the investor will be unable to collect all contractually required payments receivable.

Loans (Narrative) (Details) (USD $)	3 Months Ended	9 Months Ended																	9 Months Ended
Loans (Narrative) (Details) (USD $)	Sep. 30, 2012 loan	Sep. 30, 2012 item loan	Dec. 31, 2011 loan	Sep. 30, 2012 Commercial Real Estate [Member] loan	Dec. 31, 2011 Commercial Real Estate [Member] loan	Sep. 30, 2012 Commercial And Industrial [Member] loan	Sep. 30, 2012 Residential Real Estate [Member] loan	Sep. 30, 2012 Consumer [Member] loan	Sep. 30, 2012 Nonperforming [Member] loan	Jul. 29, 2011 First Bankshares [Member]	Sep. 30, 2012 Paragon Transaction [Member]	Jul. 29, 2011 Paragon Transaction [Member]	Sep. 30, 2012 VBB Acquisition [Member] loan	Jul. 29, 2011 VBB Acquisition [Member]	Sep. 30, 2012 VBB Acquisition [Member] Commercial Real Estate [Member] loan	Sep. 30, 2012 VBB Acquisition [Member] Commercial And Industrial [Member] loan	Sep. 30, 2012 VBB Acquisition [Member] Residential Real Estate [Member] loan	Sep. 30, 2012 VBB Acquisition [Member] Consumer [Member] loan	Sep. 30, 2012 Minimum [Member] item	Sep. 30, 2012 Maximum [Member]	Sep. 30, 2012 Single Borrower [Member] VBB Acquisition [Member] Commercial Real Estate [Member] loan
Accounts, Notes, Loans and Financing Receivable [Line Items]
Loans held for investment including unearned fees, net of capitalized origination cost	$ 233,000	$ 233,000	$ 288,000
Loans pledged as collateral for borrowing capacity	135,200,000	135,200,000
Percentage of participation interest in loans held for sale purchased, percent		99.00%
Percentage of participation interest in loans held for sale financed by originators, percent		1.00%
Loans held for sale maximum days held, (days)		30 days
Loans held for sale number of days held, typically (days)																			10 days	25 days
Number of risk rating each loan is assigned at origination (risk ratings)		2
Number of loans considered impaired, (loans)	29	29		17	3	9	2	1							14	4	2	1			5
Loan classified as impaired				5,100,000	3,200,000	2,500,000	388,000	64,000							3,600,000	754,000	388,000	64,000			193,000
Fair value adjustment related to acquired loans										7,600,000	1,300,000	1,823,000	7,500,000	13,964,000
Nonaccretable difference related to loan acquired	613,000	613,000	308,000
Impairment amount of certain loans	231,000
Number of pools for credit impaired loans (pools)																			1
Number of days loans may accrue interest (days)		90 days
Number of loans considered TDR (loans)	10	10	1						9				7
Amount of TDR's	$ 1,200,000	$ 1,200,000	$ 124,000										$ 343,000,000