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LOANS AND ALLOWANCE FOR CREDIT LOSSES - Collateral Dependent Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | $ 7,251,480 | $ 5,898,405
Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 49,236 | 36,684
Commercial and industrial | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 18,331 | 10,457
Commercial real estate | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 0 | 4,654
Multifamily | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 0 | 0
SBA | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 16,658 | 3,596
Construction | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 0 | 0
Single family residential mortgage |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment |  | 1,230,236
Single family residential mortgage | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 14,012 | 17,820
Other consumer |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment |  | 33,386
Other consumer | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 235 | 157
Commercial | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 14,207 | 8,485
Commercial | Commercial and industrial |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 2,668,984 | 2,088,308
Commercial | Commercial and industrial | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 13,518 | 5,492
Commercial | Commercial real estate | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 0 | 2,644
Commercial | Multifamily |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 1,361,054 | 1,289,820
Commercial | Multifamily | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 0 | 0
Commercial | SBA |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 205,548 | 273,444
Commercial | SBA | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 689 | 349
Commercial | Construction |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 181,841 | 176,016
Commercial | Construction | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 0 | 0
Commercial | Single family residential mortgage | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 0 | 0
Commercial | Other consumer | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 0 | 0
Residential | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 18,507 | 20,484
Residential | Commercial and industrial | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 37 | 0
Residential | Commercial real estate | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 0 | 2,010
Residential | Multifamily | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 0 | 0
Residential | SBA | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 4,458 | 497
Residential | Construction | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 0 | 0
Residential | Single family residential mortgage | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 14,012 | 17,820
Residential | Other consumer | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 0 | 157
Business Assets | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 16,287 | 7,715
Business Assets | Commercial and industrial | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 4,776 | 4,965
Business Assets | Commercial real estate | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 0 | 0
Business Assets | Multifamily | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 0 | 0
Business Assets | SBA | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 11,511 | 2,750
Business Assets | Construction | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 0 | 0
Business Assets | Single family residential mortgage | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 0 | 0
Business Assets | Other consumer | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 0 | $ 0
Automobile | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 235 |
Automobile | Commercial and industrial | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 0 |
Automobile | Commercial real estate | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 0 |
Automobile | Multifamily | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 0 |
Automobile | SBA | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 0 |
Automobile | Construction | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 0 |
Automobile | Single family residential mortgage | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | 0 |
Automobile | Other consumer | Collateral |  |
Financing Receivable, Impaired [Line Items] |  |
Total recorded investment | $ 235 |

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