Investment Securities (Other Disclosures) (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Schedule of Available-for-sale Securities [Line Items]
FHLB stock	$ 7,300,000		$ 7,300,000		$ 7,300,000
FRBR stock	3,700,000		3,700,000		3,700,000
Investment securities portfolio available as lendable collateral	378,200,000		378,200,000
Book value of securities sold	112,700,000		112,700,000
Gain on securities sold	2,002,000	(98,000)	1,956,000	(84,000)
Deposits [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities portfolio pledged as collateral	82,000,000		82,000,000
Retail repurchase agreements [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities portfolio pledged as collateral	12,300,000		12,300,000
Federal Reserve Bank of Richmond [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities portfolio pledged as collateral	4,100,000		4,100,000
Others [Member]
Schedule of Available-for-sale Securities [Line Items]
Investment securities portfolio pledged as collateral	700,000		700,000
Residential mortgage-backed securities - private [Member]
Schedule of Available-for-sale Securities [Line Items]
Number of available-for-sale securities below investment grade	4		4
Fair value of available-for-sale securities below investment grade	$ 8,100,000		$ 8,100,000