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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Risk Categories for Loans and Leases (Details) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	$ 6,659,407	$ 6,034,752
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	6,578,813	5,865,052
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	39,770	12,260
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	40,718	24,150
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	106	78
Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	133,212
PCI Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	141,826
PCI Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	2,450
PCI Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	4,056
PCI Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	2,108
PCI Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
PCI Loans | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	133,212
NTM Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	806,933	885,148
Traditional Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	5,852,474	5,007,778
Traditional Loans and Leases | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	5,774,646	4,981,404
Traditional Loans and Leases | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	38,175	4,721
Traditional Loans and Leases | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	39,547	21,575
Traditional Loans and Leases | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	106	78
Traditional Loans and Leases | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | Single family residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,973,452	2,019,161
Consumer | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	103,001	107,063
Consumer | PCI Loans | Single family residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	133,212
Consumer | PCI Loans | Single family residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | PCI Loans | Single family residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | PCI Loans | Single family residential mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | PCI Loans | Single family residential mortgage | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | PCI Loans | Single family residential mortgage | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	133,212
Consumer | PCI Loans | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | NTM Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	806,933	885,148
Consumer | NTM Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	804,167	881,198
Consumer | NTM Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,595	3,483
Consumer | NTM Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,171	467
Consumer | NTM Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | NTM Loans | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | NTM Loans | Green Loans (HELOC) - first liens
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	803,355	881,589
Consumer | NTM Loans | Green Loans (HELOC) - second liens
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	3,578	3,559
Consumer | NTM Loans | Single family residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	721,158	794,120
Consumer | NTM Loans | Single family residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	719,182	792,179
Consumer | NTM Loans | Single family residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	805	1,474
Consumer | NTM Loans | Single family residential mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,171	467
Consumer | NTM Loans | Single family residential mortgage | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | NTM Loans | Single family residential mortgage | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - first liens
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	82,197	87,469
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - first liens | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	81,407	85,460
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - first liens | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	790	2,009
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - first liens | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - first liens | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - first liens | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - second liens
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	3,578	3,559
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - second liens | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	3,578	3,559
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - second liens | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - second liens | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - second liens | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | NTM Loans | Consumer Home Equity Loan | Green Loans (HELOC) - second liens | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | NTM Loans | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | NTM Loans | Other consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | NTM Loans | Other consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | NTM Loans | Other consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | NTM Loans | Other consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | NTM Loans | Other consumer | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | Traditional Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases		5,007,778
Consumer | Traditional Loans and Leases | Single family residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,252,294	1,091,829
Consumer | Traditional Loans and Leases | Single family residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,240,866	1,080,664
Consumer | Traditional Loans and Leases | Single family residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	2,282	950
Consumer | Traditional Loans and Leases | Single family residential mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	9,146	10,215
Consumer | Traditional Loans and Leases | Single family residential mortgage | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | Traditional Loans and Leases | Single family residential mortgage | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | Traditional Loans and Leases | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	103,001	107,063
Consumer | Traditional Loans and Leases | Other consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	98,030	106,632
Consumer | Traditional Loans and Leases | Other consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	422	48
Consumer | Traditional Loans and Leases | Other consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	4,549	383
Consumer | Traditional Loans and Leases | Other consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | Traditional Loans and Leases | Other consumer | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,701,951	1,522,960
Commercial | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	717,415	729,959
Commercial | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,816,141	1,365,262
Commercial | SBA
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	78,699	73,840
Commercial | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	182,960	125,100
Commercial | Lease financing
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	13	379
Commercial | PCI Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	4,760
Commercial | PCI Loans | Commercial and industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | PCI Loans | Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	4,056
Commercial | PCI Loans | Commercial and industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	704
Commercial | PCI Loans | Commercial and industrial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | PCI Loans | Commercial and industrial | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | PCI Loans | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	1,182
Commercial | PCI Loans | Commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	1,182
Commercial | PCI Loans | Commercial real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | PCI Loans | Commercial real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | PCI Loans | Commercial real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | PCI Loans | Commercial real estate | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | PCI Loans | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | PCI Loans | SBA
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	2,672
Commercial | PCI Loans | SBA | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	1,268
Commercial | PCI Loans | SBA | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | PCI Loans | SBA | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	1,404
Commercial | PCI Loans | SBA | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | PCI Loans | SBA | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | PCI Loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | PCI Loans | Lease financing
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | NTM Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | NTM Loans | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | NTM Loans | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | NTM Loans | SBA
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | NTM Loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | NTM Loans | Lease financing
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | Traditional Loans and Leases | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,701,951	1,518,200
Commercial | Traditional Loans and Leases | Commercial and industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,651,628	1,508,636
Commercial | Traditional Loans and Leases | Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	33,376	844
Commercial | Traditional Loans and Leases | Commercial and industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	16,947	8,642
Commercial | Traditional Loans and Leases | Commercial and industrial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	78
Commercial | Traditional Loans and Leases | Commercial and industrial | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | Traditional Loans and Leases | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	717,415	728,777
Commercial | Traditional Loans and Leases | Commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	713,131	725,861
Commercial | Traditional Loans and Leases | Commercial real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	1,350
Commercial | Traditional Loans and Leases | Commercial real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	4,284	1,566
Commercial | Traditional Loans and Leases | Commercial real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | Traditional Loans and Leases | Commercial real estate | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | Traditional Loans and Leases | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,816,141	1,365,262
Commercial | Traditional Loans and Leases | Multifamily | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,815,601	1,365,262
Commercial | Traditional Loans and Leases | Multifamily | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	540	0
Commercial | Traditional Loans and Leases | Multifamily | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | Traditional Loans and Leases | Multifamily | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | Traditional Loans and Leases | Multifamily | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | Traditional Loans and Leases | SBA
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	78,699	71,168
Commercial | Traditional Loans and Leases | SBA | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	72,417	70,508
Commercial | Traditional Loans and Leases | SBA | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,555	0
Commercial | Traditional Loans and Leases | SBA | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	4,621	660
Commercial | Traditional Loans and Leases | SBA | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	106	0
Commercial | Traditional Loans and Leases | SBA | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | Traditional Loans and Leases | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	182,960	125,100
Commercial | Traditional Loans and Leases | Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	182,960	123,571
Commercial | Traditional Loans and Leases | Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	1,529
Commercial | Traditional Loans and Leases | Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | Traditional Loans and Leases | Construction | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | Traditional Loans and Leases | Construction | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | Traditional Loans and Leases | Lease financing
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	13	379
Commercial | Traditional Loans and Leases | Lease financing | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	13	270
Commercial | Traditional Loans and Leases | Lease financing | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | Traditional Loans and Leases | Lease financing | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	109
Commercial | Traditional Loans and Leases | Lease financing | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | Traditional Loans and Leases | Lease financing | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	$ 0	$ 0

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Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

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