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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Aging of Recorded Investment in Past Due Loans and Leases (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | $ 7,251,480 | $ 5,898,405
30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 36,431 | 11,673
60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 3,711 | 2,308
Greater than 89 Days Past due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 32,609 | 17,636
Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 72,751 | 31,617
Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 7,178,729 | 5,866,788
Single family residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment |  | 1,230,236
Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment |  | 33,386
Commercial | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 2,668,984 | 2,088,308
Commercial | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 1,311,105 | 807,195
Commercial | Multifamily |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 1,361,054 | 1,289,820
Commercial | SBA |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 205,548 | 273,444
Commercial | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 181,841 | 176,016
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial and industrial |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 2,668,984 | 2,088,308
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial and industrial | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 9,342 | 67
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial and industrial | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 1,351 | 0
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial and industrial | Greater than 89 Days Past due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 9,503 | 4,284
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial and industrial | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 20,196 | 4,351
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial and industrial | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 2,648,788 | 2,083,957
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial real estate |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 1,311,105 | 807,195
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial real estate | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 0 | 0
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial real estate | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 0 | 0
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial real estate | Greater than 89 Days Past due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 0 | 0
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial real estate | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 0 | 0
Commercial | Loans and Finance Receivables, Traditional Loans | Commercial real estate | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 1,311,105 | 807,195
Commercial | Loans and Finance Receivables, Traditional Loans | Multifamily |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 1,361,054 | 1,289,820
Commercial | Loans and Finance Receivables, Traditional Loans | Multifamily | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 786 | 0
Commercial | Loans and Finance Receivables, Traditional Loans | Multifamily | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 0 | 0
Commercial | Loans and Finance Receivables, Traditional Loans | Multifamily | Greater than 89 Days Past due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 0 | 0
Commercial | Loans and Finance Receivables, Traditional Loans | Multifamily | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 786 | 0
Commercial | Loans and Finance Receivables, Traditional Loans | Multifamily | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 1,360,268 | 1,289,820
Commercial | Loans and Finance Receivables, Traditional Loans | SBA |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 205,548 | 273,444
Commercial | Loans and Finance Receivables, Traditional Loans | SBA | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 987 | 354
Commercial | Loans and Finance Receivables, Traditional Loans | SBA | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 2,360 | 626
Commercial | Loans and Finance Receivables, Traditional Loans | SBA | Greater than 89 Days Past due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 15,941 | 3,062
Commercial | Loans and Finance Receivables, Traditional Loans | SBA | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 19,288 | 4,042
Commercial | Loans and Finance Receivables, Traditional Loans | SBA | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 186,260 | 269,402
Commercial | Loans and Finance Receivables, Traditional Loans | Construction |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 181,841 | 176,016
Commercial | Loans and Finance Receivables, Traditional Loans | Construction | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 0 | 0
Commercial | Loans and Finance Receivables, Traditional Loans | Construction | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 0 | 0
Commercial | Loans and Finance Receivables, Traditional Loans | Construction | Greater than 89 Days Past due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 0 | 0
Commercial | Loans and Finance Receivables, Traditional Loans | Construction | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 0 | 0
Commercial | Loans and Finance Receivables, Traditional Loans | Construction | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 181,841 | 176,016
Consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 7,251,480 |
Consumer | Single family residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 1,420,023 | 1,230,236
Consumer | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 102,925 | 33,386
Consumer | Loans and Finance Receivables, Traditional Loans | Single family residential mortgage |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 1,420,023 | 1,230,236
Consumer | Loans and Finance Receivables, Traditional Loans | Single family residential mortgage | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 24,867 | 11,036
Consumer | Loans and Finance Receivables, Traditional Loans | Single family residential mortgage | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 0 | 1,621
Consumer | Loans and Finance Receivables, Traditional Loans | Single family residential mortgage | Greater than 89 Days Past due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 7,076 | 10,290
Consumer | Loans and Finance Receivables, Traditional Loans | Single family residential mortgage | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 31,943 | 22,947
Consumer | Loans and Finance Receivables, Traditional Loans | Single family residential mortgage | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 1,388,080 | 1,207,289
Consumer | Loans and Finance Receivables, Traditional Loans | Other consumer |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 102,925 | 33,386
Consumer | Loans and Finance Receivables, Traditional Loans | Other consumer | 30 - 59 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 449 | 216
Consumer | Loans and Finance Receivables, Traditional Loans | Other consumer | 60 - 89 Days Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 0 | 61
Consumer | Loans and Finance Receivables, Traditional Loans | Other consumer | Greater than 89 Days Past due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 89 | 0
Consumer | Loans and Finance Receivables, Traditional Loans | Other consumer | Total Past Due |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | 538 | 277
Consumer | Loans and Finance Receivables, Traditional Loans | Other consumer | Current |  |
Financing Receivable, Past Due [Line Items] |  |
Total recorded investment | $ 102,387 | $ 33,109

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