LOANS RECEIVABLE AND ALLOWANCE FOR LOAN LOSSES (Details 7) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			$ 261,679
(Reversal of) provision for loan losses	$ 3,494	$ 8,000	8,481	$ 14,933
Ending balance	261,229		261,229
Ending balance allocated to:
Ending balance	261,229		261,679		$ 261,229
Loans Receivable
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	257,738	252,136	261,679	249,675
(Reversal of) provision for loan losses	3,494	8,000	8,481	14,933
Provision allocation for unfunded loan commitments and letters of credit	(4,109)	(829)	(7,029)	(1,044)
Charge-offs	(3,192)	(8,971)	(11,992)	(15,107)
Recoveries	7,298	1,012	10,090	2,891
Net recoveries (charge-offs)	4,106	(7,959)	(1,902)	(12,216)
Ending balance	261,229	251,348	261,229	251,348
Ending balance allocated to:
Individually evaluated for impairment					25,076	$ 24,841
Collectively evaluated for impairment					235,541	224,949
Acquired with deteriorated credit quality					612	1,558
Ending balance	257,738	252,136	261,679	249,675	261,229	251,348
Loans Receivable | Non-PCI loans
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	257,095	249,934	260,965	247,406
(Reversal of) provision for loan losses	3,525	8,121	8,583	15,121
Provision allocation for unfunded loan commitments and letters of credit	(4,109)	(829)	(7,029)	(1,044)
Charge-offs	(3,192)	(8,448)	(11,992)	(14,584)
Recoveries	7,298	1,012	10,090	2,891
Net recoveries (charge-offs)	4,106	(7,436)	(1,902)	(11,693)
Ending balance	260,617	249,790	260,617	249,790
Ending balance allocated to:
Individually evaluated for impairment					25,076	24,841
Collectively evaluated for impairment					235,541	224,949
Ending balance	257,095	249,934	260,965	247,406	260,617	249,790
Loans Receivable | Non-PCI loans | CRE
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	69,740	63,627	72,263	70,154
(Reversal of) provision for loan losses	5,739	(2,387)	3,406	(9,423)
Charge-offs	(348)	(894)	(1,350)	(1,213)
Recoveries	365	549	1,177	1,377
Net recoveries (charge-offs)	17	(345)	(173)	164
Ending balance	75,496	60,895	75,496	60,895
Ending balance allocated to:
Individually evaluated for impairment					1,641	4,546
Collectively evaluated for impairment					73,855	56,349
Ending balance	69,740	63,627	72,263	70,154	75,496	60,895
Loans Receivable | Non-PCI loans | C&I
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	133,914	127,156	134,598	115,184
(Reversal of) provision for loan losses	(2,716)	10,918	2,662	27,510
Charge-offs	(2,843)	(7,413)	(9,432)	(12,944)
Recoveries	5,607	396	6,134	1,307
Net recoveries (charge-offs)	2,764	(7,017)	(3,298)	(11,637)
Ending balance	133,962	131,057	133,962	131,057
Ending balance allocated to:
Individually evaluated for impairment					22,690	18,918
Collectively evaluated for impairment					111,272	112,139
Ending balance	133,914	127,156	134,598	115,184	133,962	131,057
Loans Receivable | Non-PCI loans | Residential
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	42,990	47,995	43,856	50,716
(Reversal of) provision for loan losses	(3,318)	(2,048)	(4,889)	(4,623)
Charge-offs	(1)	(61)	(747)	(344)
Recoveries	997	63	2,448	200
Net recoveries (charge-offs)	996	2	1,701	(144)
Ending balance	40,668	45,949	40,668	45,949
Ending balance allocated to:
Individually evaluated for impairment					743	1,377
Collectively evaluated for impairment					39,925	44,572
Ending balance	42,990	47,995	43,856	50,716	40,668	45,949
Loans Receivable | Non-PCI loans | Consumer
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	10,451	11,156	10,248	11,352
(Reversal of) provision for loan losses	(289)	809	375	613
Charge-offs		(80)	(463)	(83)
Recoveries	329	4	331	7
Net recoveries (charge-offs)	329	(76)	(132)	(76)
Ending balance	10,491	11,889	10,491	11,889
Ending balance allocated to:
Individually evaluated for impairment					2
Collectively evaluated for impairment					10,489	11,889
Ending balance	10,451	11,156	10,248	11,352	10,491	11,889
Loans Receivable | Non-PCI loans | Unallocated
Financing Receivable Allowance for Credit Losses Roll Forward
(Reversal of) provision for loan losses	4,109	829	7,029	1,044
Provision allocation for unfunded loan commitments and letters of credit	(4,109)	(829)	(7,029)	(1,044)
Loans Receivable | PCI loans
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	643	2,202	714	2,269
(Reversal of) provision for loan losses	(31)	(121)	(102)	(188)
Charge-offs		(523)		(523)
Net recoveries (charge-offs)		(523)		(523)
Ending balance	612	1,558	612	1,558
Ending balance allocated to:
Acquired with deteriorated credit quality					612	1,558
Ending balance	$ 643	$ 2,202	$ 714	$ 2,269	$ 612	$ 1,558