CALCULATION OF WEIGHTED AVERAGE SHARES OUTSTANDING FOR EARNINGS (LOSS) PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		12 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Earnings Per Share [Abstract]
Net income	$ 11,582	$ 9,184	$ 64,882
Preferred stock dividend accrual	0	1,550	4,938
Preferred stock discount accretion	0	454
Gain on repurchase and retirement of preferred stock			(2,471)
NET INCOME AVAILABLE TO COMMON SHAREHOLDERS	$ 11,582	$ 7,180
Basic weighted average shares outstanding	19,313	17,762
Plus unvested restricted stock	110	29
Diluted weighted shares outstanding	19,423	17,791
Earnings (loss) per common share
Basic (in dollars per share)	$ 0.60	$ 0.40
Diluted (in dollars per share)	$ 0.60	$ 0.40