Acquired Impaired Loans (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended		12 Months Ended
	Dec. 31, 2012	Dec. 31, 2010	Dec. 31, 2012 Peoples	Dec. 31, 2012 Waccamaw Bank	Dec. 31, 2012 Others	Dec. 31, 2011 Others
Acquired Impaired Loans
Balance, January 1	$ 2,886	$ 3,221			$ 2,340	$ 2,886
Impaired loans acquired	150,175		32,603	117,572
Balance, December 31	$ 141,340	$ 3,221	$ 26,907	$ 112,093	$ 2,340	$ 2,886