INCOME TAXES (Schedule of Deferred Tax Assets and Liabilities) (Details) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Deferred tax assets:
Federal net operating loss carryforwards	$ 209,190	$ 188,726
State net operating loss carryforwards	65,882	58,326
Allowance for loan losses	37,825	56,649
Loans held for sale	2,032	1,745
Alternative minimum and general business tax credits	19,146	17,326
Interest on nonaccrual loans	12,551	15,359
Deferred compensation	3,573	3,593
Core deposit intangibles	2,706	3,111
Partnership and corporate investments	7,908	12,052
Deferred loan charge-offs and other fraud losses	4,341	13,875
Other real estate and repossessed assets	22,666	22,665
Accrued contingent liabilities	2,870	3,632
Depreciation on bank premises and equipment	1,202	486
State taxes	682	0
Other	12,692	13,205
Gross deferred tax assets	405,266	410,750
Valuation allowance	(376,224)	(391,629)	(370,125)	(295,067)
Deferred tax assets, net of valuation allowance	29,042	19,121
Deferred tax liabilities:
Servicing rights	2,632	2,418
Net fair value adjustment for available-for-sale investment securities	21,214	10,466
Deferred gain on reclassification of investment securities from available for sale to held to maturity	4,265	0
Equity investments	5,364	5,366
State taxes	0	4,577
Net deferred loan fees	1,903	2,779
Other	804	655
Deferred tax liabilities	36,182	26,261
Net deferred tax liabilities	$ (7,140)	$ (7,140)