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LOANS AND LEASES AND ALLOWANCE FOR LOAN AND LEASE LOSSES - Risk Categories for Loans and Leases (Detail) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	$ 7,557,200	$ 7,700,873	$ 6,930,507
Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	7,367,563	7,543,176
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	87,761	76,945
Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	100,557	79,898
Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,319	854
NTM Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	790,405	826,731
Traditional Loans and Leases
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	6,766,795	6,874,142
Traditional Loans and Leases | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	6,593,007	6,729,707
Traditional Loans and Leases | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	74,207	65,979
Traditional Loans and Leases | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	98,262	77,602
Traditional Loans and Leases | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,319	854
Traditional Loans and Leases | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	211,549	203,976
Consumer | Single family residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	2,102,694	2,305,490
Consumer | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	62,809	70,265
Consumer | NTM Loans
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	790,405	826,731
Consumer | NTM Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	774,556	813,469
Consumer | NTM Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	13,554	10,966
Consumer | NTM Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	2,295	2,296
Consumer | NTM Loans | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Consumer | NTM Loans | Single family residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	788,054	824,318
Consumer | NTM Loans | Single family residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	772,205	811,056
Consumer | NTM Loans | Single family residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	13,554	10,966
Consumer | NTM Loans | Single family residential mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	2,295	2,296
Consumer | NTM Loans | Single family residential mortgage | Doubtful
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	2,351	2,413
Consumer | NTM Loans | Other consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	2,351	2,413
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 | Traditional Loans and Leases | Single family residential mortgage
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,314,640	1,481,172
Consumer | Traditional Loans and Leases | Single family residential mortgage | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,289,042	1,461,721
Consumer | Traditional Loans and Leases | Single family residential mortgage | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	6,554	2,602
Consumer | Traditional Loans and Leases | Single family residential mortgage | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	18,527	16,849
Consumer | Traditional Loans and Leases | Single family residential mortgage | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	517	0
Consumer | Traditional Loans and Leases | Other consumer
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	60,458	67,852
Consumer | Traditional Loans and Leases | Other consumer | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	58,910	66,228
Consumer | Traditional Loans and Leases | Other consumer | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	980	979
Consumer | Traditional Loans and Leases | Other consumer | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	568	645
Consumer | Traditional Loans and Leases | Other consumer | Doubtful
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	1,907,102	1,944,142	1,638,559
Commercial | Commercial real estate
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	865,521	867,013	773,193
Commercial | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	2,332,527	2,241,246	1,944,082
Commercial | SBA
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	74,998	68,741	79,022
Commercial | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	211,549	203,976	$ 200,766
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 | Traditional Loans and Leases | Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,907,102	1,944,142
Commercial | Traditional Loans and Leases | Commercial and industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	1,806,891	1,859,569
Commercial | Traditional Loans and Leases | Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	43,511	41,302
Commercial | Traditional Loans and Leases | Commercial and industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	56,700	43,271
Commercial | Traditional Loans and Leases | Commercial and industrial | Doubtful
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	865,521	867,013
Commercial | Traditional Loans and Leases | Commercial real estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	847,213	851,604
Commercial | Traditional Loans and Leases | Commercial real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	13,741	11,376
Commercial | Traditional Loans and Leases | Commercial real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	4,567	4,033
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 | Multifamily
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	2,332,527	2,241,246
Commercial | Traditional Loans and Leases | Multifamily | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	2,329,615	2,239,301
Commercial | Traditional Loans and Leases | Multifamily | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	0	0
Commercial | Traditional Loans and Leases | Multifamily | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	2,912	1,945
Commercial | Traditional Loans and Leases | Multifamily | Doubtful
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	74,998	68,741
Commercial | Traditional Loans and Leases | SBA | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	60,082	53,433
Commercial | Traditional Loans and Leases | SBA | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	4,316	6,114
Commercial | Traditional Loans and Leases | SBA | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	9,798	8,340
Commercial | Traditional Loans and Leases | SBA | Doubtful
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	802	854
Commercial | Traditional Loans and Leases | Construction
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	211,549	203,976
Commercial | Traditional Loans and Leases | Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	201,254	197,851
Commercial | Traditional Loans and Leases | Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	5,105	3,606
Commercial | Traditional Loans and Leases | Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Total loans and leases	5,190	2,519
Commercial | Traditional Loans and Leases | Construction | Doubtful
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://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

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

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