LOANS RECEIVABLE AND ALLOWANCE FOR CREDIT LOSSES (Details 7) - Loans Receivable - Non-PCI Loans - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	$ 65,762	$ 36,254	$ 24,264
Principal
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	57,729	17,191	13,124
Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	0	18,588	6,644
Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	6,722	0	2,259
Interest Deferments
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	237	0	0
Other
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	1,074	475	2,237
CRE
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	23,707	1,810	8,624
CRE | Principal
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	22,633	548	691
CRE | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	0	787	5,100
CRE | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	0	0	2,165
CRE | Interest Deferments
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	0	0	0
CRE | Other
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	1,074	475	668
C&I
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	40,405	34,165	3,162
C&I | Principal
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	34,499	16,364	2,677
C&I | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	0	17,801	73
C&I | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	5,876	0	94
C&I | Interest Deferments
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	30	0	0
C&I | Other
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	0	0	318
Residential
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	1,268	279	11,974
Residential | Principal
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	264	279	9,756
Residential | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	0	0	1,471
Residential | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	797	0	0
Residential | Interest Deferments
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	207	0	0
Residential | Other
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	0	$ 0	747
Consumer
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	382		504
Consumer | Principal
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	333		0
Consumer | Principal and Interest
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	0		0
Consumer | Interest Rate Reduction
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	49		0
Consumer | Interest Deferments
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	0		0
Consumer | Other
Financing Receivable, Modifications [Line Items]
Post-Modification Outstanding Recorded Investment	$ 0		$ 504