LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES (Details 10) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Allowance for loan losses
Beginning balance	$ 264,959
Charge-offs	(1,900)	$ (5,100)	$ (5,200)
Ending balance	260,520	264,959
CRE
Allowance for loan losses
Beginning balance	81,538
Ending balance	72,916	81,538
C&I
Allowance for loan losses
Beginning balance	134,606
Ending balance	142,167	134,606
Residential
Allowance for loan losses
Beginning balance	39,295
Ending balance	37,338	39,295
Consumer
Allowance for loan losses
Beginning balance	9,520
Ending balance	8,099	9,520
PCI Loans
Allowance for loan losses
Beginning balance	359
Ending balance	118	359
PCI Loans | CRE
Allowance for loan losses
Beginning balance	347
Ending balance	112	347
PCI Loans | C&I
Allowance for loan losses
Beginning balance	9
Ending balance	1	9
PCI Loans | Residential
Allowance for loan losses
Beginning balance	3
Ending balance	5	3
PCI Loans | Consumer
Allowance for loan losses
Beginning balance	0
Ending balance	0	0
Loans Receivable
Allowance for loan losses
Beginning balance	264,959	261,679	249,675
(Reversal of) provision for loan losses	31,718	6,569	47,583
Charge-offs	(48,508)	(24,254)	(50,618)
Recoveries	12,351	20,965	15,039
Net recoveries (charge-offs)	(36,157)	(3,289)	(35,579)
Ending balance	260,520	264,959	261,679
Loans Receivable | PCI Loans
Allowance for loan losses
Beginning balance	359	714	2,269
(Reversal of) provision for loan losses	(241)	(355)	(1,032)
Charge-offs	0	0	(523)
Recoveries	0	0	0
Net recoveries (charge-offs)	0	0	(523)
Ending balance	118	359	714
Loans Receivable | Non-PCI Loans
Allowance for loan losses
Beginning balance	264,600	260,965	247,406
(Reversal of) provision for loan losses	31,959	6,924	48,615
Charge-offs	(48,508)	(24,254)	(50,095)
Recoveries	12,351	20,965	15,039
Net recoveries (charge-offs)	(36,157)	(3,289)	(35,056)
Ending balance	260,402	264,600	260,965
Loans Receivable | Non-PCI Loans | CRE
Allowance for loan losses
Beginning balance	81,191	72,263	70,154
(Reversal of) provision for loan losses	(9,497)	3,338	3,264
Charge-offs	(581)	(1,545)	(3,137)
Recoveries	1,691	7,135	1,982
Net recoveries (charge-offs)	1,110	5,590	(1,155)
Ending balance	72,804	81,191	72,263
Loans Receivable | Non-PCI Loans | C&I
Allowance for loan losses
Beginning balance	134,597	134,598	115,184
(Reversal of) provision for loan losses	46,855	11,640	49,200
Charge-offs	(47,739)	(20,423)	(39,984)
Recoveries	8,453	8,782	10,198
Net recoveries (charge-offs)	(39,286)	(11,641)	(29,786)
Ending balance	142,166	134,597	134,598
Loans Receivable | Non-PCI Loans | Residential
Allowance for loan losses
Beginning balance	39,292	43,856	50,716
(Reversal of) provision for loan losses	(3,670)	(7,499)	(8,167)
Charge-offs	(166)	(1,686)	(1,103)
Recoveries	1,877	4,621	2,410
Net recoveries (charge-offs)	1,711	2,935	1,307
Ending balance	37,333	39,292	43,856
Loans Receivable | Non-PCI Loans | Consumer
Allowance for loan losses
Beginning balance	9,520	10,248	11,352
(Reversal of) provision for loan losses	(1,729)	(555)	4,318
Charge-offs	(22)	(600)	(5,871)
Recoveries	330	427	449
Net recoveries (charge-offs)	308	(173)	(5,422)
Ending balance	$ 8,099	$ 9,520	$ 10,248