Assets Acquired In FDIC-Assisted Acquisitions (Pro Forma Information Of Acquisitions) (Detail) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2011	Jun. 30, 2010
Net interest income and noninterest income	$ 37,756	$ 37,462	$ 94,217	$ 70,496
Net income (loss)	2,495	2,275	7,747	(2,104)
Net income (loss) available to common stockholders	$ 1,678	$ 1,468	$ 6,115	$ (3,709)
Income (loss) per common share available to common stockholders - basic	$ 0.07	$ 0.06	$ 0.26	$ (0.16)
Income (loss) per common share available to common stockholders - diluted	$ 0.07	$ 0.06	$ 0.26	$ (0.16)
Average number of shares outstanding, basic	23,819	23,449	23,791	23,445
Average number of shares outstanding, diluted	23,973	23,508	23,945	23,491