INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Current Income Tax (Expense) Benefit:
Federal	$ (29,591)	$ (24,177)	$ (15,129)
State	(7,667)	(1,825)	(9,562)
Total current income tax expense	(37,258)	(26,002)	(24,691)
Deferred Income Tax (Expense) Benefit:
Federal	9,099	(2,550)	(11,726)
State	(1,586)	(8,143)	(383)
Total deferred income tax expense	7,513	(10,693)	(12,109)
Recorded income tax expense	(29,745)	(36,695)	(36,800)
Applicable Federal statutory income tax rate (as a percent)	35.00%
Reconciliation of the recorded income tax benefit (expense)
Computed expected income tax expense benefit at Federal statutory rate	(26,201)	(32,724)	(30,626)
State tax expense, net of federal tax benefit	(6,014)	(6,479)	(6,464)
Tax-exempt interest benefit	3,979	1,847	406
Increase in cash surrender value of life insurance	407	442	504
Tax credits	2,480	1,313	556
Nondeductible employer compensation	(4,730)	(322)	(572)
Nondeductible acquisition-related expense	(1,196)	(532)
Acquisition-related securities gain	1,828
Other, net	(298)	(240)	(604)
Recorded income tax expense	$ (29,745)	$ (36,695)	$ (36,800)