LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES (Details 10) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			$ 264,959
Ending balance	$ 266,768		266,768
Allowance for Unfunded Credit Reserve
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	21,414	$ 15,632	20,360	$ 12,712
(Reversal of) provision for unfunded lending commitments	(1,096)	4,109	(42)	7,029
Ending balance	20,318	19,741	20,318	19,741
CRE
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			81,538
Ending balance	78,345		78,345
C&I
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			134,606
Ending balance	148,435		148,435
Residential
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			39,295
Ending balance	31,567		31,567
Consumer
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			9,520
Ending balance	8,421		8,421
PCI Loans
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			359
Ending balance	257		257
PCI Loans | CRE
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			347
Ending balance	243		243
PCI Loans | C&I
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			9
Ending balance	8		8
PCI Loans | Residential
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			3
Ending balance	6		6
PCI Loans | Consumer
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance			0
Ending balance	0		0
Loans Receivable
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	260,238	257,738	264,959	261,679
(Reversal of) provision for loan losses	7,149	(615)	7,535	1,452
Charge-offs	(2,356)	(3,192)	(8,410)	(11,992)
Recoveries	1,737	7,298	2,684	10,090
Net recoveries (charge-offs)	(619)	4,106	(5,726)	(1,902)
Ending balance	266,768	261,229	266,768	261,229
Loans Receivable | PCI Loans
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	328	643	359	714
(Reversal of) provision for loan losses	(71)	(31)	(102)	(102)
Charge-offs	0	0	0	0
Recoveries	0	0	0	0
Net recoveries (charge-offs)	0	0	0	0
Ending balance	257	612	257	612
Loans Receivable | Non-PCI Loans
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	259,910	257,095	264,600	260,965
(Reversal of) provision for loan losses	7,220	(584)	7,637	1,554
Charge-offs	(2,356)	(3,192)	(8,410)	(11,992)
Recoveries	1,737	7,298	2,684	10,090
Net recoveries (charge-offs)	(619)	4,106	(5,726)	(1,902)
Ending balance	266,511	260,617	266,511	260,617
Loans Receivable | Non-PCI Loans | CRE
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	82,538	69,740	81,191	72,263
(Reversal of) provision for loan losses	(4,439)	5,739	(3,133)	3,406
Charge-offs	(139)	(348)	(195)	(1,350)
Recoveries	142	365	239	1,177
Net recoveries (charge-offs)	3	17	44	(173)
Ending balance	78,102	75,496	78,102	75,496
Loans Receivable | Non-PCI Loans | C&I
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	134,077	133,914	134,597	134,598
(Reversal of) provision for loan losses	15,347	(2,716)	20,001	2,662
Charge-offs	(2,214)	(2,843)	(8,074)	(9,432)
Recoveries	1,217	5,607	1,903	6,134
Net recoveries (charge-offs)	(997)	2,764	(6,171)	(3,298)
Ending balance	148,427	133,962	148,427	133,962
Loans Receivable | Non-PCI Loans | Residential
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	33,935	42,990	39,292	43,856
(Reversal of) provision for loan losses	(2,671)	(3,318)	(7,988)	(4,889)
Charge-offs	0	(1)	(137)	(747)
Recoveries	297	997	394	2,448
Net recoveries (charge-offs)	297	996	257	1,701
Ending balance	31,561	40,668	31,561	40,668
Loans Receivable | Non-PCI Loans | Consumer
Financing Receivable Allowance for Credit Losses Roll Forward
Beginning balance	9,360	10,451	9,520	10,248
(Reversal of) provision for loan losses	(1,017)	(289)	(1,243)	375
Charge-offs	(3)	0	(4)	(463)
Recoveries	81	329	148	331
Net recoveries (charge-offs)	78	329	144	(132)
Ending balance	$ 8,421	$ 10,491	$ 8,421	$ 10,491