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VARIABLE INTEREST ENTITIES - Additional Information (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 USD ($) | Dec. 31, 2022 USD ($) trust | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Variable Interest Entity [Line Items] |  |  |  |
Total assets |  | $ 9,197,016 | $ 9,393,743 |
Other CRA investments |  | $ 85,000 | 77,600 |
Number of grantor trusts | trust |  | 2 |  |
Small Business Investment Companies (SBICs) |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Ownership percentage of limited partnership (percent) |  | 3.00% |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets |  | $ 251,589 | 259,746 |
Maximum loss exposure |  | 21,410 | 25,888 |
Fundings |  | 0 | 0 | $ 3,631
Investments in grantor trusts |  | 527 | 527 |
Variable Interest Entity, Not Primary Beneficiary | Other Assets |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Total assets |  | 21,400 | $ 25,900 |
Variable Interest Entity, Not Primary Beneficiary | Multifamily |  |  |  |
Variable Interest Entity [Line Items] |  |  |  |
Maximum loss exposure |  | $ 68,800 |  |
Fundings | $ 573,500 |  |  |
Credit losses guaranteed (percent) |  | 12.00% |  |
Unpaid principal amount |  | $ 114,900 |  |
Repurchase liability recognized |  | $ 2,000 |  |

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