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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Aging of Recorded Investment in Past Due Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019	Mar. 31, 2019
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 84,970	$ 57,607
Current	5,582,494	5,894,278
Total	5,667,464	5,951,885	$ 7,557,200
30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	45,182	19,290
60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	11,156	13,583
Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	28,632	24,734
Traditional Loans
Financing Receivable, Past Due [Line Items]
Total Past Due	56,967	37,080
Current	5,050,439	5,314,149
Total	5,107,406	5,351,229
Traditional Loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	37,139	15,317
Traditional Loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	5,773	10,048
Traditional Loans | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	14,055	11,715
Consumer | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Total	1,467,375	1,590,774
Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Total	47,229	54,165
Consumer | Non-Traditional Mortgage (NTM) loans
Financing Receivable, Past Due [Line Items]
Total Past Due	28,003	20,527
Current	532,055	580,129
Total	560,058	600,656
Consumer | Non-Traditional Mortgage (NTM) loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	8,043	3,973
Consumer | Non-Traditional Mortgage (NTM) loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	5,383	3,535
Consumer | Non-Traditional Mortgage (NTM) loans | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	14,577	13,019
Consumer | Non-Traditional Mortgage (NTM) loans | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Total Past Due	28,003	20,527
Current	530,161	577,830
Total	558,164	598,357
Consumer | Non-Traditional Mortgage (NTM) loans | Single family residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	8,043	3,973
Consumer | Non-Traditional Mortgage (NTM) loans | Single family residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	5,383	3,535
Consumer | Non-Traditional Mortgage (NTM) loans | Single family residential mortgage | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	14,577	13,019
Consumer | Non-Traditional Mortgage (NTM) loans | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Current	1,894	2,299
Total	1,894	2,299
Consumer | Non-Traditional Mortgage (NTM) loans | Other consumer | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Consumer | Non-Traditional Mortgage (NTM) loans | Other consumer | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Consumer | Non-Traditional Mortgage (NTM) loans | Other consumer | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Consumer | Traditional Loans | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Total Past Due	43,364	22,854
Current	865,847	969,563
Total	909,211	992,417
Consumer | Traditional Loans | Single family residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	32,993	13,752
Consumer | Traditional Loans | Single family residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	1,600	3,496
Consumer | Traditional Loans | Single family residential mortgage | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	8,771	5,606
Consumer | Traditional Loans | Other consumer
Financing Receivable, Past Due [Line Items]
Total Past Due	794	334
Current	44,541	51,532
Total	45,335	51,866
Consumer | Traditional Loans | Other consumer | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	754	199
Consumer | Traditional Loans | Other consumer | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	40
Consumer | Traditional Loans | Other consumer | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	40	95
Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total	1,578,223	1,691,270	1,907,102
Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total	810,024	818,817	865,521
Commercial | Multifamily
Financing Receivable, Past Due [Line Items]
Total	1,466,083	1,494,528	2,332,527
Commercial | SBA
Financing Receivable, Past Due [Line Items]
Total	70,583	70,981	74,998
Commercial | Construction
Financing Receivable, Past Due [Line Items]
Total	227,947	231,350	$ 211,549
Commercial | Traditional Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Total Past Due	6,937	10,312
Current	1,571,286	1,680,958
Total	1,578,223	1,691,270
Commercial | Traditional Loans | Commercial and industrial | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	649	780
Commercial | Traditional Loans | Commercial and industrial | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	3,687	5,670
Commercial | Traditional Loans | Commercial and industrial | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,601	3,862
Commercial | Traditional Loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Total Past Due	264	0
Current	809,760	818,817
Total	810,024	818,817
Commercial | Traditional Loans | Commercial real estate | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | Commercial real estate | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	264	0
Commercial | Traditional Loans | Commercial real estate | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | Multifamily
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Current	1,466,083	1,494,528
Total	1,466,083	1,494,528
Commercial | Traditional Loans | Multifamily | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | Multifamily | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | Multifamily | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | SBA
Financing Receivable, Past Due [Line Items]
Total Past Due	4,874	3,580
Current	65,709	67,401
Total	70,583	70,981
Commercial | Traditional Loans | SBA | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,009	586
Commercial | Traditional Loans | SBA | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	222	842
Commercial | Traditional Loans | SBA | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	2,643	2,152
Commercial | Traditional Loans | Construction
Financing Receivable, Past Due [Line Items]
Total Past Due	734	0
Current	227,213	231,350
Total	227,947	231,350
Commercial | Traditional Loans | Construction | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	734	0
Commercial | Traditional Loans | Construction | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Total Past Due	0	0
Commercial | Traditional Loans | Construction | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Total Past Due	$ 0	$ 0

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