EARNINGS (LOSS) PER SHARE (Details) (USD $) In Thousands, except Share data, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
EARNINGS (LOSS) PER SHARE
Net income (loss)	$ 12,410	$ 10,721	$ 10,812	$ 13,478	$ 12,095	$ 11,626	$ 8,211	$ 4,639	$ 47,421	$ 36,571	$ (250,953)
Preferred stock dividends, accretion of discount and conversion of preferred stock to common stock										(83,897)	8,432
Net income (loss) available to common shareholders									$ 47,421	$ 120,468	$ (259,385)
Weighted average shares outstanding - basic									41,720,000	35,891,000	1,516,000
SHARE-BASED COMPENSATION
Dilutive effect of Treasury warrants (in shares)									22,000	20,000
Weighted average shares outstanding - diluted									42,084,000	36,342,000	1,516,000
Basic earnings (loss) per share (in dollars per share)	$ 0.30	$ 0.26	$ 0.26	$ 0.32	$ 0.29	$ 0.28	$ 0.20	$ 4.59	$ 1.14	$ 3.36	$ (171.13)
Diluted earnings (loss) per share (in dollars per share)	$ 0.29	$ 0.26	$ 0.26	$ 0.32	$ 0.29	$ 0.28	$ 0.20	$ 4.58	$ 1.13	$ 3.31	$ (171.13)
Antidilutive securities excluded from the dilutive share calculation (in shares)									316,188	40,166	128,677
Employee stock options and awards
SHARE-BASED COMPENSATION
Dilutive effect of share-based compensation arrangements									278,000	415,000
Deferred salary restricted stock units
SHARE-BASED COMPENSATION
Dilutive effect of share-based compensation arrangements									64,000	16,000