Premises and Equipment, net - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012 Branch Office	Sep. 30, 2011	Sep. 30, 2012 Branch Office	Sep. 30, 2011
Property, Plant and Equipment [Line Items]
Number of commercial and consumer banking branches	25		25
Number of leased branches	5		5
Number of owned branches	20		20
Number of Limited service offices	6		6
Number of branches to be sold	2		2
Depreciation expense	$ 578	$ 581	$ 1,908	$ 1,772
Greenville County [Member]
Property, Plant and Equipment [Line Items]
Number of leased branches	1		1