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LOANS AND ALLOWANCE FOR LOAN LOSSES - Risk Categories for Loans and Leases (Detail) - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018	Jun. 30, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 6,719,570	$ 7,700,873	$ 7,036,004
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,502,365	7,543,176
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	109,194	76,945
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	106,692	79,898
Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,319	854
NTM Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,719,570	7,700,873
Traditional Loans and Leases
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,972,304	6,874,142
Traditional Loans and Leases | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,770,273	6,729,707
Traditional Loans and Leases | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	96,443	65,979
Traditional Loans and Leases | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	104,269	77,602
Traditional Loans and Leases | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,319	854
Traditional Loans and Leases | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	209,029	203,976
Consumer | Single family residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,961,065	2,305,490
Consumer | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	61,365	70,265
Consumer | NTM Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	747,266	826,731
Consumer | NTM Loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	732,092	813,469
Consumer | NTM Loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	12,751	10,966
Consumer | NTM Loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,423	2,296
Consumer | NTM Loans | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Consumer | NTM Loans | Single family residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	745,019	824,318
Consumer | NTM Loans | Single family residential mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	729,845	811,056
Consumer | NTM Loans | Single family residential mortgage | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	12,751	10,966
Consumer | NTM Loans | Single family residential mortgage | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,423	2,296
Consumer | NTM Loans | Single family residential mortgage | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Consumer | NTM Loans | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,247	2,413
Consumer | NTM Loans | Other consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,247	2,413
Consumer | NTM Loans | Other consumer | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Consumer | NTM Loans | Other consumer | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Consumer | NTM Loans | Other consumer | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Consumer | Traditional Loans and Leases | Single family residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,216,046	1,481,172
Consumer | Traditional Loans and Leases | Single family residential mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,193,532	1,461,721
Consumer | Traditional Loans and Leases | Single family residential mortgage | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,017	2,602
Consumer | Traditional Loans and Leases | Single family residential mortgage | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	15,980	16,849
Consumer | Traditional Loans and Leases | Single family residential mortgage | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	517	0
Consumer | Traditional Loans and Leases | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	59,118	67,852
Consumer | Traditional Loans and Leases | Other consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	57,177	66,228
Consumer | Traditional Loans and Leases | Other consumer | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	471	979
Consumer | Traditional Loans and Leases | Other consumer | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,470	645
Consumer | Traditional Loans and Leases | Other consumer | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Commercial | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,951,707	1,944,142	1,742,559
Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	856,497	867,013	793,855
Commercial | Multifamily
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,598,978	2,241,246	1,959,965
Commercial | SBA
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	80,929	68,741	78,092
Commercial | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	209,029	203,976	$ 211,110
Commercial | Traditional Loans and Leases | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,951,707	1,944,142
Commercial | Traditional Loans and Leases | Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,844,472	1,859,569
Commercial | Traditional Loans and Leases | Commercial and industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	50,702	41,302
Commercial | Traditional Loans and Leases | Commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	56,533	43,271
Commercial | Traditional Loans and Leases | Commercial and industrial | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Commercial | Traditional Loans and Leases | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	856,497	867,013
Commercial | Traditional Loans and Leases | Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	832,173	851,604
Commercial | Traditional Loans and Leases | Commercial real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	14,519	11,376
Commercial | Traditional Loans and Leases | Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	9,805	4,033
Commercial | Traditional Loans and Leases | Commercial real estate | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Commercial | Traditional Loans and Leases | Multifamily
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,598,978	2,241,246
Commercial | Traditional Loans and Leases | Multifamily | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,581,629	2,239,301
Commercial | Traditional Loans and Leases | Multifamily | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	11,488	0
Commercial | Traditional Loans and Leases | Multifamily | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,861	1,945
Commercial | Traditional Loans and Leases | Multifamily | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	0	0
Commercial | Traditional Loans and Leases | SBA
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	80,929	68,741
Commercial | Traditional Loans and Leases | SBA | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	66,448	53,433
Commercial | Traditional Loans and Leases | SBA | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	4,074	6,114
Commercial | Traditional Loans and Leases | SBA | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	9,605	8,340
Commercial | Traditional Loans and Leases | SBA | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	802	854
Commercial | Traditional Loans and Leases | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	209,029	203,976
Commercial | Traditional Loans and Leases | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	194,842	197,851
Commercial | Traditional Loans and Leases | Construction | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	9,172	3,606
Commercial | Traditional Loans and Leases | Construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,015	2,519
Commercial | Traditional Loans and Leases | Construction | Doubtful
Financing Receivable, Credit Quality Indicator [Line Items]
Total 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=118952595&loc=d3e4428-111522

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-Publisher FASB
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-Paragraph 4
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