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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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