CALCULATION OF EARNINGS PER COMMON SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended												12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	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, 2013	Dec. 31, 2012	Dec. 31, 2011
Earnings Per Share [Abstract]
Net income	$ 11,554	$ 11,665	$ 11,753	$ 11,582	$ 14,688	$ 15,620	$ 25,390	$ 9,184	$ 5,070	$ 6,030	$ 2,199	$ (7,842)	$ 46,555	$ 64,882	$ 5,457
Preferred stock dividend accrual	0	0	0	0	(611)	(1,227)	(1,550)	(1,550)	(1,550)	(1,550)	(1,550)	(1,550)	0	(4,938)	(6,200)
Preferred stock discount accretion	0	0	0	0	(1,174)	(1,216)	(454)	(454)	(425)	(425)	(425)	(426)	0	(3,298)	(1,701)
Gain on repurchase of preferred stock	0	0	0	0	401	2,070	0	0	0	0	0	0	0	2,471	0
NET INCOME (LOSS) AVAILABLE TO COMMON SHAREHOLDERS	$ 11,554	$ 11,665	$ 11,753	$ 11,582	$ 13,304	$ 15,247	$ 23,386	$ 7,180	$ 3,095	$ 4,055	$ 224	$ (9,818)	$ 46,555	$ 59,117	$ (2,444)
Weighted average number of common shares outstanding
Basic weighted average shares outstanding (in shares)													19,361	18,650	16,724
Diluted weighted shares outstanding (in shares)													19,397	18,723	16,753
Earnings (loss) per common share
Basic (in dollars per share)	$ 0.60	$ 0.60	$ 0.60	$ 0.60	$ 0.69	$ 0.81	$ 1.27	$ 0.40	$ 0.18	$ 0.24	$ 0.01	$ (0.61)	$ 2.40	$ 3.17	$ (0.15)
Diluted (in dollars per share)	$ 0.60	$ 0.60	$ 0.60	$ 0.60	$ 0.69	$ 0.80	$ 1.27	$ 0.40	$ 0.18	$ 0.24	$ 0.01	$ (0.61)	$ 2.40	$ 3.16	$ (0.15)