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		9 Months Ended		12 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Earnings Per Share [Abstract]
Net income	$ 11,665	$ 15,620	$ 35,001	$ 50,194	$ 64,882
Preferred stock dividend accrual	0	1,227	0	4,327	4,938
Preferred stock discount accretion	0	1,216	0	2,124
Gain on repurchase of preferred stock	0	(2,070)	0	(2,070)	(2,471)
NET INCOME AVAILABLE TO COMMON SHAREHOLDERS	$ 11,665	$ 15,247	$ 35,001	$ 45,813
Basic weighted average shares outstanding	19,338	19,172	19,348	18,428
Plus unvested restricted stock	59	113	55	61
Diluted weighted shares outstanding	19,397	19,285	19,403	18,489
Earnings (loss) per common share
Basic (in dollars per share)	$ 0.60	$ 0.80	$ 1.81	$ 2.49
Diluted (in dollars per share)	$ 0.60	$ 0.79	$ 1.80	$ 2.48