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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Risk Categories for Loans and Leases (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016	Sep. 30, 2016
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 6,226,897	$ 6,034,752	$ 6,568,791
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	6,156,030	5,865,052
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	46,298	12,260
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	24,569	24,150
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	78
Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	0	133,212
Purchased Credit Impaired
Financing Receivable, Recorded Investment [Line Items]
Loans	0	141,826	642,367
Purchased Credit Impaired | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	0	2,450
Purchased Credit Impaired | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	0	4,056
Purchased Credit Impaired | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	0	2,108
Purchased Credit Impaired | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Purchased Credit Impaired | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	0	133,212
Non-Traditional Mortgages (NTM)
Financing Receivable, Recorded Investment [Line Items]
Loans	793,946	885,148
Traditional Loans
Financing Receivable, Recorded Investment [Line Items]
Loans	5,432,951	5,007,778
Traditional Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	5,363,753	4,981,404
Traditional Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	45,800	4,721
Traditional Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	23,398	21,575
Traditional Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	78
Traditional Loans | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Traditional Loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans	176,397	125,100
Consumer | Single family residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans	1,838,021	2,019,161
Consumer | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Loans	114,122	107,063
Consumer | Purchased Credit Impaired | Single family residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans	0	133,212
Consumer | Purchased Credit Impaired | Single family residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Purchased Credit Impaired | Single family residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Purchased Credit Impaired | Single family residential mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Purchased Credit Impaired | Single family residential mortgage | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Purchased Credit Impaired | Single family residential mortgage | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	0	133,212
Consumer | Purchased Credit Impaired | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Non-Traditional Mortgages (NTM)
Financing Receivable, Recorded Investment [Line Items]
Loans	793,946	885,148
Consumer | Non-Traditional Mortgages (NTM) | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	792,277	881,198
Consumer | Non-Traditional Mortgages (NTM) | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	498	3,483
Consumer | Non-Traditional Mortgages (NTM) | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	1,171	467
Consumer | Non-Traditional Mortgages (NTM) | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Non-Traditional Mortgages (NTM) | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - first liens
Financing Receivable, Recorded Investment [Line Items]
Loans	790,388	881,589
Consumer | Non-Traditional Mortgages (NTM) | Green Loans (HELOC) - second liens
Financing Receivable, Recorded Investment [Line Items]
Loans	3,558	3,559
Consumer | Non-Traditional Mortgages (NTM) | Single family residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans	708,099	794,120
Consumer | Non-Traditional Mortgages (NTM) | Single family residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	706,928	792,179
Consumer | Non-Traditional Mortgages (NTM) | Single family residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	0	1,474
Consumer | Non-Traditional Mortgages (NTM) | Single family residential mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	1,171	467
Consumer | Non-Traditional Mortgages (NTM) | Single family residential mortgage | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Non-Traditional Mortgages (NTM) | Single family residential mortgage | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - first liens
Financing Receivable, Recorded Investment [Line Items]
Loans	82,289	87,469
Consumer | Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - first liens | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	81,791	85,460
Consumer | Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - first liens | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	498	2,009
Consumer | Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - first liens | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - first liens | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - first liens | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - second liens
Financing Receivable, Recorded Investment [Line Items]
Loans	3,558	3,559
Consumer | Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - second liens | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	3,558	3,559
Consumer | Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - second liens | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - second liens | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - second liens | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Non-Traditional Mortgages (NTM) | Consumer Home Equity Loan | Green Loans (HELOC) - second liens | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Non-Traditional Mortgages (NTM) | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Traditional Loans | Single family residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans	1,129,922	1,091,829
Consumer | Traditional Loans | Single family residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	1,120,856	1,080,664
Consumer | Traditional Loans | Single family residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	0	950
Consumer | Traditional Loans | Single family residential mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	9,066	10,215
Consumer | Traditional Loans | Single family residential mortgage | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Traditional Loans | Single family residential mortgage | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Traditional Loans | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Loans	114,122	107,063
Consumer | Traditional Loans | Other consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	109,366	106,632
Consumer | Traditional Loans | Other consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	49	48
Consumer | Traditional Loans | Other consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	4,707	383
Consumer | Traditional Loans | Other consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Traditional Loans | Other consumer | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans	1,602,805	1,522,960	1,531,041
Commercial | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans	713,120	729,959	721,838
Commercial | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Loans	1,617,890	1,365,262	1,199,207
Commercial | SBA
Financing Receivable, Recorded Investment [Line Items]
Loans	78,604	73,840	67,737
Commercial | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans	176,397	125,100	99,086
Commercial | Lease financing
Financing Receivable, Recorded Investment [Line Items]
Loans	91	379	234,540
Commercial | Purchased Credit Impaired | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans	0	4,760	4,796
Commercial | Purchased Credit Impaired | Commercial and industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Purchased Credit Impaired | Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	0	4,056
Commercial | Purchased Credit Impaired | Commercial and industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	0	704
Commercial | Purchased Credit Impaired | Commercial and industrial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Purchased Credit Impaired | Commercial and industrial | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Purchased Credit Impaired | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans	0	1,182	2,418
Commercial | Purchased Credit Impaired | Commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	0	1,182
Commercial | Purchased Credit Impaired | Commercial real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Purchased Credit Impaired | Commercial real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Purchased Credit Impaired | Commercial real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Purchased Credit Impaired | Commercial real estate | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Purchased Credit Impaired | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0	0
Commercial | Purchased Credit Impaired | SBA
Financing Receivable, Recorded Investment [Line Items]
Loans	0	2,672	2,760
Commercial | Purchased Credit Impaired | SBA | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	0	1,268
Commercial | Purchased Credit Impaired | SBA | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Purchased Credit Impaired | SBA | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	0	1,404
Commercial | Purchased Credit Impaired | SBA | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Purchased Credit Impaired | SBA | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Purchased Credit Impaired | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0	0
Commercial | Purchased Credit Impaired | Lease financing
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0	$ 0
Commercial | Non-Traditional Mortgages (NTM) | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Non-Traditional Mortgages (NTM) | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Non-Traditional Mortgages (NTM) | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Non-Traditional Mortgages (NTM) | SBA
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Non-Traditional Mortgages (NTM) | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Non-Traditional Mortgages (NTM) | Lease financing
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Traditional Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans	1,602,805	1,518,200
Commercial | Traditional Loans | Commercial and industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	1,560,142	1,508,636
Commercial | Traditional Loans | Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	39,288	844
Commercial | Traditional Loans | Commercial and industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	3,375	8,642
Commercial | Traditional Loans | Commercial and industrial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	78
Commercial | Traditional Loans | Commercial and industrial | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Traditional Loans | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans	713,120	728,777
Commercial | Traditional Loans | Commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	707,707	725,861
Commercial | Traditional Loans | Commercial real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	3,366	1,350
Commercial | Traditional Loans | Commercial real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	2,047	1,566
Commercial | Traditional Loans | Commercial real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Traditional Loans | Commercial real estate | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Traditional Loans | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Loans	1,617,890	1,365,262
Commercial | Traditional Loans | Multifamily | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	1,617,346	1,365,262
Commercial | Traditional Loans | Multifamily | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	544	0
Commercial | Traditional Loans | Multifamily | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Traditional Loans | Multifamily | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Traditional Loans | Multifamily | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Traditional Loans | SBA
Financing Receivable, Recorded Investment [Line Items]
Loans	78,604	71,168
Commercial | Traditional Loans | SBA | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	71,889	70,508
Commercial | Traditional Loans | SBA | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	2,553	0
Commercial | Traditional Loans | SBA | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	4,162	660
Commercial | Traditional Loans | SBA | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Traditional Loans | SBA | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Traditional Loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans	176,397	125,100
Commercial | Traditional Loans | Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	176,397	123,571
Commercial | Traditional Loans | Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	0	1,529
Commercial | Traditional Loans | Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Traditional Loans | Construction | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Traditional Loans | Construction | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Traditional Loans | Lease financing
Financing Receivable, Recorded Investment [Line Items]
Loans	91	379
Commercial | Traditional Loans | Lease financing | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	50	270
Commercial | Traditional Loans | Lease financing | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Traditional Loans | Lease financing | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	41	109
Commercial | Traditional Loans | Lease financing | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Traditional Loans | Lease financing | Not-Rated
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 0	$ 0

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No definition available.

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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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