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		6 Months Ended		12 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Earnings Per Share [Abstract]
Net income	$ 11,753	$ 25,390	$ 23,336	$ 34,574	$ 64,882
Preferred stock dividend accrual	0	1,550	0	3,100	4,938
Preferred stock discount accretion	0	454	0	908
Gain on repurchase and retirement of preferred stock					(2,471)
NET INCOME AVAILABLE TO COMMON SHAREHOLDERS	$ 11,753	$ 23,386	$ 23,336	$ 30,566
Basic weighted average shares outstanding	19,333	18,404	19,323	18,052
Plus unvested restricted stock	64	40	62	34
Diluted weighted shares outstanding	19,397	18,444	19,385	18,086
Earnings (loss) per common share
Basic (in dollars per share)	$ 0.61	$ 1.27	$ 1.21	$ 1.69
Diluted (in dollars per share)	$ 0.60	$ 1.27	$ 1.20	$ 1.69