EARNINGS PER SHARE (Details) (USD $) In Thousands, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended		12 Months Ended
	Jun. 30, 2012	Jun. 30, 2011	Jun. 30, 2012	Jun. 30, 2011	Dec. 31, 2011
Net income	$ 6,034	$ 4,634	$ 11,823	$ 9,739	$ 33,777
Less: Net income allocated to participating securities-basic:
Preferred stock	357	274	700	576
Non-vested restricted stock	60	63	134	143
Net income available to common stock holders-basic	5,617	4,297	10,989	9,020
Add: Net income allocated per two-class method-diluted:
Stock options and Class C warrants	22	15	43	32
Net income available to common stockholders-diluted	$ 5,639	$ 4,312	$ 11,032	$ 9,052
Weighted average common shares outstanding-basic (in shares)	19,082	19,006	19,060	18,983
Common stock equivalents from:
Weighted average common shares outstanding-diluted (in shares)	20,256	20,025	20,161	19,982
Basic earnings per share (in dollars per share)	$ 0.29	$ 0.23	$ 0.58	$ 0.48
Diluted earnings per share (in dollars per share)	$ 0.28	$ 0.22	$ 0.55	$ 0.45
Common stock equivalent shares excluded due to anti-dilutive effect (in shares)	167	189	180	192
Stock Options [Member]
Common stock equivalents from:
Common stock equivalents (in shares)	26	24	24	23
Class C Warrants [Member]
Common stock equivalents from:
Common stock equivalents (in shares)	1,148	995	1,077	976