INCOME TAXES (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2012	Sep. 30, 2012	Jun. 29, 2012	Mar. 31, 2012	Dec. 31, 2011	Sep. 30, 2011	Jun. 30, 2011	Mar. 31, 2011	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Current Income Taxes:
Federal									$ (24,177)	$ (15,129)	$ 7,912
State									(1,825)	(9,562)	(3,557)
Total current income tax (expense) benefit									(26,002)	(24,691)	4,355
Deferred Income Taxes:
Federal									(2,550)	(11,726)	27,263
State									(8,143)	(383)	15,096
Total deferred income tax (expense) benefit									(10,693)	(12,109)	42,359
Recorded income tax (expense) benefit	(12,576)	(10,849)	(10,413)	(2,857)	(10,553)	(9,345)	(9,160)	(7,742)	(36,695)	(36,800)	46,714
Applicable statutory Federal 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									(32,724)	(30,626)	38,056
State tax (expense) benefit, net of federal tax benefit									(6,479)	(6,464)	7,500
Tax-exempt interest									1,847	406	37
Increase in cash surrender value of life insurance									442	504	486
Tax credits									1,313	556	523
Other, net									(1,094)	(1,176)	112
Recorded income tax (expense) benefit	$ (12,576)	$ (10,849)	$ (10,413)	$ (2,857)	$ (10,553)	$ (9,345)	$ (9,160)	$ (7,742)	$ (36,695)	$ (36,800)	$ 46,714