Premises and Equipment, net - Additional Information (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2013 Branch Office	Mar. 31, 2012
Property, Plant and Equipment [Line Items]
Number of commercial and consumer banking branches	25
Number of leased branches	5
Number of owned branches	20
Number of Limited service offices	6
Depreciation expense	$ 639	$ 781
Greenville County [Member]
Property, Plant and Equipment [Line Items]
Number of leased branches	1