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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, 2018	Dec. 31, 2017	Sep. 30, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 7,253,293	$ 6,659,407	$ 6,226,897
Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	7,118,475	6,578,813
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	58,942	39,770
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	75,596	40,718
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	280	106
NTM Loans
Financing Receivable, Recorded Investment [Line Items]
Loans	834,301	806,933
Traditional Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Loans	6,418,992	5,852,474
Traditional Loans and Leases | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	6,288,256	5,774,646
Traditional Loans and Leases | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	57,366	38,175
Traditional Loans and Leases | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	73,090	39,547
Traditional Loans and Leases | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	280	106
Traditional Loans and Leases | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans	200,294	182,960
Consumer | Single family residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans	2,300,069	2,055,649
Consumer | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Loans	72,998	106,579
Consumer | NTM Loans
Financing Receivable, Recorded Investment [Line Items]
Loans	834,301	806,933
Consumer | NTM Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	830,219	804,167
Consumer | NTM Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	1,576	1,595
Consumer | NTM Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	2,506	1,171
Consumer | NTM Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | NTM Loans | Single family residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans	831,169	803,355
Consumer | NTM Loans | Single family residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	827,087	800,589
Consumer | NTM Loans | Single family residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	1,576	1,595
Consumer | NTM Loans | Single family residential mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	2,506	1,171
Consumer | NTM Loans | Single family residential mortgage | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | NTM Loans | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Loans	3,132	3,578
Consumer | NTM Loans | Other consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	3,132	3,578
Consumer | NTM Loans | Other consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | NTM Loans | Other consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | NTM Loans | Other consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Traditional Loans and Leases | Single family residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Loans	1,468,900	1,252,294
Consumer | Traditional Loans and Leases | Single family residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	1,446,826	1,240,866
Consumer | Traditional Loans and Leases | Single family residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	2,969	2,282
Consumer | Traditional Loans and Leases | Single family residential mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	19,105	9,146
Consumer | Traditional Loans and Leases | Single family residential mortgage | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Consumer | Traditional Loans and Leases | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Loans	69,866	103,001
Consumer | Traditional Loans and Leases | Other consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	68,998	98,030
Consumer | Traditional Loans and Leases | Other consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	404	422
Consumer | Traditional Loans and Leases | Other consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	464	4,549
Consumer | Traditional Loans and Leases | Other consumer | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans	1,673,055	1,701,951	1,602,805
Commercial | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans	823,193	717,415	713,120
Commercial | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Loans	2,112,190	1,816,141	1,617,890
Commercial | SBA
Financing Receivable, Recorded Investment [Line Items]
Loans	71,494	78,699	78,604
Commercial | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans	200,294	182,960	176,397
Commercial | Lease financing
Financing Receivable, Recorded Investment [Line Items]
Loans	0	13	$ 91
Commercial | NTM Loans | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | NTM Loans | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | NTM Loans | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | NTM Loans | SBA
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | NTM Loans | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | NTM Loans | Lease financing
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Traditional Loans and Leases | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans	1,673,055	1,701,951
Commercial | Traditional Loans and Leases | Commercial and industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	1,600,534	1,651,628
Commercial | Traditional Loans and Leases | Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	34,482	33,376
Commercial | Traditional Loans and Leases | Commercial and industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	38,039	16,947
Commercial | Traditional Loans and Leases | Commercial and industrial | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Traditional Loans and Leases | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Loans	823,193	717,415
Commercial | Traditional Loans and Leases | Commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	807,803	713,131
Commercial | Traditional Loans and Leases | Commercial real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	11,320	0
Commercial | Traditional Loans and Leases | Commercial real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	4,070	4,284
Commercial | Traditional Loans and Leases | Commercial real estate | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Traditional Loans and Leases | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Loans	2,112,190	1,816,141
Commercial | Traditional Loans and Leases | Multifamily | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	2,110,589	1,815,601
Commercial | Traditional Loans and Leases | Multifamily | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	0	540
Commercial | Traditional Loans and Leases | Multifamily | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	1,601	0
Commercial | Traditional Loans and Leases | Multifamily | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Traditional Loans and Leases | SBA
Financing Receivable, Recorded Investment [Line Items]
Loans	71,494	78,699
Commercial | Traditional Loans and Leases | SBA | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	56,649	72,417
Commercial | Traditional Loans and Leases | SBA | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	4,754	1,555
Commercial | Traditional Loans and Leases | SBA | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	9,811	4,621
Commercial | Traditional Loans and Leases | SBA | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	280	106
Commercial | Traditional Loans and Leases | Construction
Financing Receivable, Recorded Investment [Line Items]
Loans	200,294	182,960
Commercial | Traditional Loans and Leases | Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	196,857	182,960
Commercial | Traditional Loans and Leases | Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	3,437	0
Commercial | Traditional Loans and Leases | Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Traditional Loans and Leases | Construction | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Traditional Loans and Leases | Lease financing
Financing Receivable, Recorded Investment [Line Items]
Loans	0	13
Commercial | Traditional Loans and Leases | Lease financing | Pass
Financing Receivable, Recorded Investment [Line Items]
Loans	0	13
Commercial | Traditional Loans and Leases | Lease financing | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Traditional Loans and Leases | Lease financing | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans	0	0
Commercial | Traditional Loans and Leases | Lease financing | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Loans	$ 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://fasb.org/us-gaap/role/ref/legacyRef
-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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
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