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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Aging of Recorded Investment in Past Due Loans (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | $ 6,228,575 | $ 5,898,405
30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 18,332 | 11,673
60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 4,812 | 2,308
Greater than 89 Days Past due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 21,979 | 17,636
Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 45,123 | 31,617
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 6,183,452 | 5,866,788
Traditional Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 5,657,197 | 5,461,292
Traditional Loans | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 11,234 | 7,473
Traditional Loans | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 4,812 | 1,667
Traditional Loans | Greater than 89 Days Past due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 19,572 | 11,088
Traditional Loans | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 35,618 | 20,228
Traditional Loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 5,621,579 | 5,441,064
Consumer | Single family residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 1,393,696 | 1,230,236
Consumer | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 23,298 | 33,386
Consumer | Non-traditional Mortgage (NTM) Loans |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 571,378 | 437,113
Consumer | Non-traditional Mortgage (NTM) Loans | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 7,098 | 4,200
Consumer | Non-traditional Mortgage (NTM) Loans | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 0 | 641
Consumer | Non-traditional Mortgage (NTM) Loans | Greater than 89 Days Past due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 2,407 | 6,548
Consumer | Non-traditional Mortgage (NTM) Loans | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 9,505 | 11,389
Consumer | Non-traditional Mortgage (NTM) Loans | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 561,873 | 425,724
Consumer | Non-traditional Mortgage (NTM) Loans | Single family residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 569,781 | 435,515
Consumer | Non-traditional Mortgage (NTM) Loans | Single family residential mortgage | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 7,098 | 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 | 0 | 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 | 2,407 | 6,548
Consumer | Non-traditional Mortgage (NTM) Loans | Single family residential mortgage | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 9,505 | 11,389
Consumer | Non-traditional Mortgage (NTM) Loans | Single family residential mortgage | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 560,276 | 424,126
Consumer | Non-traditional Mortgage (NTM) Loans | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 1,597 | 1,598
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 | 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 | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 1,597 | 1,598
Consumer | Traditional Loans | Single family residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 823,915 | 794,721
Consumer | Traditional Loans | Single family residential mortgage | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 4,274 | 6,836
Consumer | Traditional Loans | Single family residential mortgage | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 1,016 | 980
Consumer | Traditional Loans | Single family residential mortgage | Greater than 89 Days Past due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 4,311 | 3,742
Consumer | Traditional Loans | Single family residential mortgage | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 9,601 | 11,558
Consumer | Traditional Loans | Single family residential mortgage | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 814,314 | 783,163
Consumer | Traditional Loans | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 21,701 | 31,788
Consumer | Traditional Loans | Other consumer | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 0 | 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
Consumer | Traditional Loans | Other consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 0 | 277
Consumer | Traditional Loans | Other consumer | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 21,701 | 31,511
Commercial | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 2,296,626 | 2,088,308
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 907,224 | 807,195
Commercial | Multifamily |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 1,295,613 | 1,289,820
Commercial | SBA |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 181,582 | 273,444
Commercial | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 130,536 | 176,016
Commercial | Traditional Loans | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 2,296,626 | 2,088,308
Commercial | Traditional Loans | Commercial and industrial | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 3,624 | 67
Commercial | Traditional Loans | Commercial and industrial | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 3,796 | 0
Commercial | Traditional Loans | Commercial and industrial | Greater than 89 Days Past due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 2,876 | 4,284
Commercial | Traditional Loans | Commercial and industrial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 10,296 | 4,351
Commercial | Traditional Loans | Commercial and industrial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 2,286,330 | 2,083,957
Commercial | Traditional Loans | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 907,224 | 807,195
Commercial | Traditional Loans | Commercial real estate | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 0 | 0
Commercial | Traditional Loans | Commercial real estate | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 0 | 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 | Commercial real estate | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 0 | 0
Commercial | Traditional Loans | Commercial real estate | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 907,224 | 807,195
Commercial | Traditional Loans | Multifamily |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 1,295,613 | 1,289,820
Commercial | Traditional Loans | Multifamily | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 791 | 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 | Multifamily | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 791 | 0
Commercial | Traditional Loans | Multifamily | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 1,294,822 | 1,289,820
Commercial | Traditional Loans | SBA |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 181,582 | 273,444
Commercial | Traditional Loans | SBA | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 2,545 | 354
Commercial | Traditional Loans | SBA | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 0 | 626
Commercial | Traditional Loans | SBA | Greater than 89 Days Past due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 12,385 | 3,062
Commercial | Traditional Loans | SBA | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 14,930 | 4,042
Commercial | Traditional Loans | SBA | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 166,652 | 269,402
Commercial | Traditional Loans | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 130,536 | 176,016
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
Commercial | Traditional Loans | Construction | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | 0 | 0
Commercial | Traditional Loans | Construction | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Loans receivable | $ 130,536 | $ 176,016

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