CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY
Shares issued in common stock offerings (in shares)		1,407,220
Shares issued in the acquisition of Hamptons State Bank (in shares)		273,479
Cash dividend declared (in dollars per share)	$ 1.15	$ 0.69	$ 0.92