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LOANS AND ALLOWANCE FOR LOAN LOSSES - Risk Categories for Loans and Leases (Detail) - USD ($) $ in Thousands	Sep. 30, 2019	Dec. 31, 2018	Sep. 30, 2018
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	$ 6,383,259	$ 7,700,873	$ 7,253,293
Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,187,912	7,543,176
Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	108,266	76,945
Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	85,762	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	6,383,259	7,700,873
Traditional Loans and Leases
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,729,784	6,874,142
Traditional Loans and Leases | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,551,654	6,729,707
Traditional Loans and Leases | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	103,093	65,979
Traditional Loans and Leases | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	73,718	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	228,561	203,976
Consumer | Single family residential mortgage
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,775,953	2,305,490
Consumer | Other consumer
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	59,122	70,265
Consumer | NTM Loans
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	653,475	826,731
Consumer | NTM Loans | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	636,258	813,469
Consumer | NTM Loans | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,173	10,966
Consumer | NTM Loans | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	12,044	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	651,167	824,318
Consumer | NTM Loans | Single family residential mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	633,950	811,056
Consumer | NTM Loans | Single family residential mortgage | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	5,173	10,966
Consumer | NTM Loans | Single family residential mortgage | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	12,044	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	2,308	2,413
Consumer | NTM Loans | Other consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,308	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	1,124,786	1,481,172
Consumer | Traditional Loans and Leases | Single family residential mortgage | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,100,990	1,461,721
Consumer | Traditional Loans and Leases | Single family residential mortgage | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	4,291	2,602
Consumer | Traditional Loans and Leases | Single family residential mortgage | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	18,988	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	56,814	67,852
Consumer | Traditional Loans and Leases | Other consumer | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	55,947	66,228
Consumer | Traditional Loans and Leases | Other consumer | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	317	979
Consumer | Traditional Loans and Leases | Other consumer | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	550	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	1,789,478	1,944,142	1,673,055
Commercial | Commercial real estate
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	891,029	867,013	823,193
Commercial | Multifamily
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,563,757	2,241,246	2,112,190
Commercial | SBA
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	75,359	68,741	71,494
Commercial | Construction
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	228,561	203,976	$ 200,294
Commercial | Traditional Loans and Leases | Commercial and industrial
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,789,478	1,944,142
Commercial | Traditional Loans and Leases | Commercial and industrial | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,673,655	1,859,569
Commercial | Traditional Loans and Leases | Commercial and industrial | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	77,431	41,302
Commercial | Traditional Loans and Leases | Commercial and industrial | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	38,392	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	891,029	867,013
Commercial | Traditional Loans and Leases | Commercial real estate | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	887,232	851,604
Commercial | Traditional Loans and Leases | Commercial real estate | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,520	11,376
Commercial | Traditional Loans and Leases | Commercial real estate | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,277	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	1,563,757	2,241,246
Commercial | Traditional Loans and Leases | Multifamily | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	1,551,231	2,239,301
Commercial | Traditional Loans and Leases | Multifamily | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	8,428	0
Commercial | Traditional Loans and Leases | Multifamily | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	4,098	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	75,359	68,741
Commercial | Traditional Loans and Leases | SBA | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	63,543	53,433
Commercial | Traditional Loans and Leases | SBA | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	3,120	6,114
Commercial | Traditional Loans and Leases | SBA | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	7,894	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	228,561	203,976
Commercial | Traditional Loans and Leases | Construction | Pass
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	219,056	197,851
Commercial | Traditional Loans and Leases | Construction | Special Mention
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	6,986	3,606
Commercial | Traditional Loans and Leases | Construction | Substandard
Financing Receivable, Credit Quality Indicator [Line Items]
Total loans	2,519	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
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-Publisher FASB
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