LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES (Details 7) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			$ 261,679
Ending balance	$ 264,430		264,430
CRE
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			72,977
Ending balance	78,318		78,318
C&I
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			134,598
Ending balance	138,929		138,929
Residential
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			43,856
Ending balance	36,812		36,812
Consumer
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			10,248
Ending balance	10,371		10,371
PCI loans
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			714
Ending balance	541		541
PCI loans | CRE
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			714
Ending balance	541		541
PCI loans | C&I
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			0
Ending balance	0		0
PCI loans | Residential
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			0
Ending balance	0		0
PCI loans | Consumer
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			0
Ending balance	0		0
Unfunded Lending Commitments
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	19,741	$ 12,326	12,712	$ 11,282
Provision for unfunded lending commitments	(698)	(623)	6,331	421
Charge-offs	0	145	0	145
Ending balance	19,043	11,558	19,043	11,558
Loans Receivable
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	261,229	251,348	261,679	249,675
Provision for loan losses	8,434	15,848	9,886	29,737
Charge-offs	(7,480)	(17,717)	(19,473)	(32,824)
Recoveries	2,247	3,699	12,338	6,590
Net recoveries (charge-offs)	(5,233)	(14,018)	(7,135)	(26,234)
Ending balance	264,430	253,178	264,430	253,178
Loans Receivable | PCI loans
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	612	1,558	714	2,269
Provision for loan losses	(71)	(844)	(173)	(1,032)
Charge-offs	0	0	0	(523)
Recoveries	0	0	0	0
Net recoveries (charge-offs)	0	0	0	(523)
Ending balance	541	714	541	714
Loans Receivable | Non-PCI loans
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	260,617	249,790	260,965	247,406
Provision for loan losses	8,505	16,692	10,059	30,769
Charge-offs	(7,480)	(17,717)	(19,473)	(32,301)
Recoveries	2,247	3,699	12,338	6,590
Net recoveries (charge-offs)	(5,233)	(14,018)	(7,135)	(25,711)
Ending balance	263,889	252,464	263,889	252,464
Loans Receivable | Non-PCI loans | CRE
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	75,496	60,895	72,263	70,154
Provision for loan losses	2,333	69	5,739	(9,354)
Charge-offs	(135)	(1,548)	(1,486)	(2,761)
Recoveries	83	259	1,261	1,636
Net recoveries (charge-offs)	(52)	(1,289)	(225)	(1,125)
Ending balance	77,777	59,675	77,777	59,675
Loans Receivable | Non-PCI loans | C&I
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	133,962	131,057	134,598	115,184
Provision for loan losses	11,221	16,888	13,883	44,398
Charge-offs	(7,187)	(16,027)	(16,619)	(28,971)
Recoveries	933	3,342	7,067	4,649
Net recoveries (charge-offs)	(6,254)	(12,685)	(9,552)	(24,322)
Ending balance	138,929	135,260	138,929	135,260
Loans Receivable | Non-PCI loans | Residential
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	40,668	45,949	43,856	50,716
Provision for loan losses	(4,979)	(839)	(9,868)	(5,462)
Charge-offs	(35)	(8)	(782)	(352)
Recoveries	1,158	95	3,606	295
Net recoveries (charge-offs)	1,123	87	2,824	(57)
Ending balance	36,812	45,197	36,812	45,197
Loans Receivable | Non-PCI loans | Consumer
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	10,491	11,889	10,248	11,352
Provision for loan losses	(70)	574	305	1,187
Charge-offs	(123)	(134)	(586)	(217)
Recoveries	73	3	404	10
Net recoveries (charge-offs)	(50)	(131)	(182)	(207)
Ending balance	$ 10,371	$ 12,332	$ 10,371	$ 12,332