Net Income Per Share (Detail) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Earnings Per Share Disclosure [Line Items]
Basic net income (loss) per share:	$ 11,236	$ 6,742	$ 34,812	$ 17,691
Loss on extinguishment of trust preferred securities		(10,857)		(10,857)
Loss on CPP unamortized discount		(1,401)		(1,401)
Less: Preferred Stock dividends and discount accretion	(1,134)	(868)	(3,404)	(2,846)
NET INCOME (LOSS) AVAILABLE TO COMMON STOCKHOLDERS	10,102	(6,384)	31,408	2,587
Effect of dilutive stock options and warrants
Net income (loss) available to common stockholders	$ 10,102	$ (6,384)	$ 31,408	$ 2,587
Net income (loss) available to common stockholders	28,649,996	26,367,067	28,619,186	25,879,277
Effect of dilutive stock options and warrants	238,080		200,097	139,659
Net income (loss) available to common stockholders	28,888,076	26,367,067	28,819,283	26,018,936
Net income (loss) available to common stockholders	$ 0.35	$ (0.25)	$ 1.09	$ 0.10
Diluted net income (loss) per share:
Net income (loss) available to common stockholders	$ 0.35	$ (0.25)	$ 1.09	$ 0.10