CONSOLIDATED STATEMENTS OF CHANGES IN STOCKHOLDERS' EQUITY (Parenthetical) - shares	9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014
Statement of Stockholders' Equity [Abstract]
Issuance of shares of common stock pursuant to various stock compensation plans and agreements, shares	414,623	398,012
Issuance of shares pursuant to Director retainer fee, shares	17,840	18,909
Cancellation of common stock due to forfeitures of issued restricted stock, shares		17,337
Restricted stock surrendered due to employee tax liability, shares	144,738	208,440
Issuance of shares pursuant to MetroCorp Bancshares, Inc. acquisition, shares		5,583,093