INCOME TAXES (Details 2) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred tax liabilities:
Core deposit intangibles	$ (20,261)	$ (21,064)
Affordable housing partnership and other investments		(15,888)
Fixed assets	(20,716)	(19,473)
Federal Housing Loan Bank stock	(6,539)	(14,561)
Deferred loan fees	(2,041)	(2,533)
Purchased loan discounts	(66)	(126)
State taxes	(8,244)	(1,079)
Section 597 gain	(2,127)	(49,687)
FDIC receivable		(252,602)
Acquired debt	(868)	(11,854)
Other, net	(2,125)	(5,882)
Total gross deferred tax (liabilities)	(62,987)	(394,749)
Deferred tax assets:
Affordable housing partnerships and other investments	6,638
Allowance for loan losses and REO reserves	118,773	116,064
FDIC receivable and clawback	48,366
Deferred compensation	21,290	17,146
Mortgage servicing assets	3,305	368
Purchased loan premium	376	544
Unrealized loss on securities	55,375	81,712
Acquired loans and REOs	176,294	394,208
Other, net	17,253	40,574
Total gross deferred tax assets	447,670	650,616
Valuation allowance	(316)	(337)
Net deferred tax assets	384,367	255,530
Federal
Deferred tax liabilities:
Core deposit intangibles	(15,748)	(16,422)
Affordable housing partnership and other investments		(14,158)
Fixed assets	(16,615)	(15,594)
Federal Housing Loan Bank stock	(5,064)	(11,337)
Deferred loan fees	(1,587)	(1,976)
Purchased loan discounts	(51)	(98)
State taxes	(8,244)	(1,079)
Section 597 gain	(2,063)	(48,370)
FDIC receivable		(245,907)
Acquired debt	(2,237)	(10,812)
Other, net	(1,652)	(6,805)
Total gross deferred tax (liabilities)	(53,261)	(372,558)
Deferred tax assets:
Affordable housing partnerships and other investments	1,768
Allowance for loan losses and REO reserves	93,749	93,018
FDIC receivable and clawback	36,630
Deferred compensation	16,505	13,322
Mortgage servicing assets	2,570	287
Purchased loan premium	292	424
Unrealized loss on securities	42,737	62,535
Acquired loans and REOs	139,360	366,290
Other, net	12,189	30,768
Total gross deferred tax assets	345,800	566,644
Net deferred tax assets	292,539	194,086
State
Deferred tax liabilities:
Core deposit intangibles	(4,513)	(4,642)
Affordable housing partnership and other investments		(1,730)
Fixed assets	(4,101)	(3,879)
Federal Housing Loan Bank stock	(1,475)	(3,224)
Deferred loan fees	(454)	(557)
Purchased loan discounts	(15)	(28)
Section 597 gain	(64)	(1,317)
FDIC receivable		(6,695)
Acquired debt	1,369	(1,042)
Other, net	(473)	923
Total gross deferred tax (liabilities)	(9,726)	(22,191)
Deferred tax assets:
Affordable housing partnerships and other investments	4,870
Allowance for loan losses and REO reserves	23,615	23,046
FDIC receivable and clawback	11,736
Deferred compensation	4,785	3,824
Mortgage servicing assets	735	81
Purchased loan premium	84	120
Unrealized loss on securities	12,638	19,177
Acquired loans and REOs	36,678	26,959
Other, net	4,967	9,709
Total gross deferred tax assets	100,108	82,916
Valuation allowance	(316)	(337)
Net deferred tax assets	90,066	60,388
Foreign
Deferred tax assets:
Allowance for loan losses and REO reserves	1,409
Acquired loans and REOs	256	959
Other, net	97	97
Total gross deferred tax assets	1,762	1,056
Net deferred tax assets	$ 1,762	$ 1,056