LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES (Details 10) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	$ 264,959
Ending balance	260,238
Unfunded Lending Commitments
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	20,360	$ 12,712
Provision for unfunded credit reserves	1,054	2,920
Ending balance	21,414	15,632
CRE
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	81,538
Ending balance	82,852
C&I
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	134,606
Ending balance	134,087
Residential
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	39,295
Ending balance	33,939
Consumer
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	9,520
Ending balance	9,360
PCI Loans
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	359
Ending balance	328
PCI Loans | CRE
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	347
Ending balance	314
PCI Loans | C&I
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	9
Ending balance	10
PCI Loans | Residential
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	3
Ending balance	4
PCI Loans | Consumer
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	0
Ending balance	0
Loans Receivable
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	264,959	261,679
Provision for (reversal of) loan losses	386	2,067
Charge-offs	(6,054)	(8,800)
Recoveries	947	2,792
Net recoveries (charge-offs)	(5,107)	(6,008)
Ending balance	260,238	257,738
Loans Receivable | PCI Loans
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	359	714
Provision for (reversal of) loan losses	(31)	(71)
Charge-offs	0	0
Recoveries	0	0
Net recoveries (charge-offs)	0	0
Ending balance	328	643
Loans Receivable | Non-PCI loans
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	264,600	260,965
Provision for (reversal of) loan losses	417	2,138
Charge-offs	(6,054)	(8,800)
Recoveries	947	2,792
Net recoveries (charge-offs)	(5,107)	(6,008)
Ending balance	259,910	257,095
Loans Receivable | Non-PCI loans | CRE
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	81,191	72,263
Provision for (reversal of) loan losses	1,306	(2,333)
Charge-offs	(56)	(1,002)
Recoveries	97	812
Net recoveries (charge-offs)	41	(190)
Ending balance	82,538	69,740
Loans Receivable | Non-PCI loans | C&I
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	134,597	134,598
Provision for (reversal of) loan losses	4,654	5,378
Charge-offs	(5,860)	(6,589)
Recoveries	686	527
Net recoveries (charge-offs)	(5,174)	(6,062)
Ending balance	134,077	133,914
Loans Receivable | Non-PCI loans | Residential
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	39,292	43,856
Provision for (reversal of) loan losses	(5,317)	(1,571)
Charge-offs	(137)	(746)
Recoveries	97	1,451
Net recoveries (charge-offs)	(40)	705
Ending balance	33,935	42,990
Loans Receivable | Non-PCI loans | Consumer
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	9,520	10,248
Provision for (reversal of) loan losses	(226)	664
Charge-offs	(1)	(463)
Recoveries	67	2
Net recoveries (charge-offs)	66	(461)
Ending balance	$ 9,360	$ 10,451