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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Aging of Recorded Investment in Past Due Loans (Detail) - USD ($) $ in Thousands	Mar. 31, 2021	Dec. 31, 2020
Financing Receivable, Past Due [Line Items]
Loans receivable	$ 5,764,401	$ 5,898,405
Current
Financing Receivable, Past Due [Line Items]
Loans receivable	5,703,104	5,866,788
Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	61,297	31,617
30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	23,591	11,673
60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	7,414	2,308
Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	30,292	17,636
Traditional Loans
Financing Receivable, Past Due [Line Items]
Loans receivable	5,352,265	5,461,292
Traditional Loans | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	5,307,205	5,441,064
Traditional Loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	45,060	20,228
Traditional Loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	16,792	7,473
Traditional Loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	4,973	1,667
Traditional Loans | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	23,295	11,088
Consumer | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Loans receivable	1,253,251	1,230,236
Consumer | Other consumer
Financing Receivable, Past Due [Line Items]
Loans receivable	26,557	33,386
Consumer | Non-Traditional Mortgage (NTM) loans
Financing Receivable, Past Due [Line Items]
Loans receivable	412,136	437,113
Consumer | Non-Traditional Mortgage (NTM) loans | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	395,899	425,724
Consumer | Non-Traditional Mortgage (NTM) loans | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	16,237	11,389
Consumer | Non-Traditional Mortgage (NTM) loans | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	6,799	4,200
Consumer | Non-Traditional Mortgage (NTM) loans | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	2,441	641
Consumer | Non-Traditional Mortgage (NTM) loans | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	6,997	6,548
Consumer | Non-Traditional Mortgage (NTM) loans | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Loans receivable	410,530	435,515
Consumer | Non-Traditional Mortgage (NTM) loans | Single family residential mortgage | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	394,293	424,126
Consumer | Non-Traditional Mortgage (NTM) loans | Single family residential mortgage | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	16,237	11,389
Consumer | Non-Traditional Mortgage (NTM) loans | Single family residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	6,799	4,200
Consumer | Non-Traditional Mortgage (NTM) loans | Single family residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	2,441	641
Consumer | Non-Traditional Mortgage (NTM) loans | Single family residential mortgage | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	6,997	6,548
Consumer | Non-Traditional Mortgage (NTM) loans | Other consumer
Financing Receivable, Past Due [Line Items]
Loans receivable	1,606	1,598
Consumer | Non-Traditional Mortgage (NTM) loans | Other consumer | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	1,606	1,598
Consumer | Non-Traditional Mortgage (NTM) loans | Other consumer | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Consumer | Non-Traditional Mortgage (NTM) loans | Other consumer | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Consumer | Non-Traditional Mortgage (NTM) loans | Other consumer | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Consumer | Non-Traditional Mortgage (NTM) loans | Other consumer | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Consumer | Traditional Loans | Single family residential mortgage
Financing Receivable, Past Due [Line Items]
Loans receivable	842,721	794,721
Consumer | Traditional Loans | Single family residential mortgage | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	811,135	783,163
Consumer | Traditional Loans | Single family residential mortgage | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	31,586	11,558
Consumer | Traditional Loans | Single family residential mortgage | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	11,729	6,836
Consumer | Traditional Loans | Single family residential mortgage | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	2,536	980
Consumer | Traditional Loans | Single family residential mortgage | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	17,321	3,742
Consumer | Traditional Loans | Other consumer
Financing Receivable, Past Due [Line Items]
Loans receivable	24,951	31,788
Consumer | Traditional Loans | Other consumer | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	24,867	31,511
Consumer | Traditional Loans | Other consumer | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	84	277
Consumer | Traditional Loans | Other consumer | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	84	216
Consumer | Traditional Loans | Other consumer | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	61
Consumer | Traditional Loans | Other consumer | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans receivable	1,878,325	2,088,308
Commercial | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable	839,965	807,195
Commercial | Multifamily
Financing Receivable, Past Due [Line Items]
Loans receivable	1,258,278	1,289,820
Commercial | SBA
Financing Receivable, Past Due [Line Items]
Loans receivable	338,903	273,444
Commercial | Construction
Financing Receivable, Past Due [Line Items]
Loans receivable	169,122	176,016
Commercial | Traditional Loans | Commercial and industrial
Financing Receivable, Past Due [Line Items]
Loans receivable	1,878,325	2,088,308
Commercial | Traditional Loans | Commercial and industrial | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	1,874,277	2,083,957
Commercial | Traditional Loans | Commercial and industrial | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	4,048	4,351
Commercial | Traditional Loans | Commercial and industrial | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	14	67
Commercial | Traditional Loans | Commercial and industrial | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	517	0
Commercial | Traditional Loans | Commercial and industrial | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	3,517	4,284
Commercial | Traditional Loans | Commercial real estate
Financing Receivable, Past Due [Line Items]
Loans receivable	839,965	807,195
Commercial | Traditional Loans | Commercial real estate | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	836,398	807,195
Commercial | Traditional Loans | Commercial real estate | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	3,567	0
Commercial | Traditional Loans | Commercial real estate | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	2,644	0
Commercial | Traditional Loans | Commercial real estate | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	923	0
Commercial | Traditional Loans | Commercial real estate | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Traditional Loans | Multifamily
Financing Receivable, Past Due [Line Items]
Loans receivable	1,258,278	1,289,820
Commercial | Traditional Loans | Multifamily | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	1,257,477	1,289,820
Commercial | Traditional Loans | Multifamily | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	801	0
Commercial | Traditional Loans | Multifamily | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	801	0
Commercial | Traditional Loans | Multifamily | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Traditional Loans | Multifamily | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Traditional Loans | SBA
Financing Receivable, Past Due [Line Items]
Loans receivable	338,903	273,444
Commercial | Traditional Loans | SBA | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	333,929	269,402
Commercial | Traditional Loans | SBA | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	4,974	4,042
Commercial | Traditional Loans | SBA | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	1,520	354
Commercial | Traditional Loans | SBA | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	997	626
Commercial | Traditional Loans | SBA | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	2,457	3,062
Commercial | Traditional Loans | Construction
Financing Receivable, Past Due [Line Items]
Loans receivable	169,122	176,016
Commercial | Traditional Loans | Construction | Current
Financing Receivable, Past Due [Line Items]
Loans receivable	169,122	176,016
Commercial | Traditional Loans | Construction | Total Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Traditional Loans | Construction | 30 - 59 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Traditional Loans | Construction | 60 - 89 Days Past Due
Financing Receivable, Past Due [Line Items]
Loans receivable	0	0
Commercial | Traditional Loans | Construction | Greater than 89 Days Past due
Financing Receivable, Past Due [Line Items]
Loans receivable	$ 0	$ 0

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