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LOAN COMMITMENTS AND OTHER RELATED ACTIVITIES - Contractual Amount of Financial Instruments with Off-Balance-Sheet Risk (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2023 | Dec. 31, 2022 | Jul. 25, 2023
Other Commitments [Line Items] |  |  |
Unfunded commitment | $ 15,350 | $ 17,480 |
Derivatives asset, notional amount | 5,233,632 | 39,579 |
Contingent forward loan sale agreement |  |  |
Other Commitments [Line Items] |  |  |
Derivatives asset, notional amount | 1,803,869 | 0 | $ 1,800,000
LIHTC Investments |  |  |
Other Commitments [Line Items] |  |  |
Unfunded commitment | 15,400 | 17,500 |
Small Business Investment Companies |  |  |
Other Commitments [Line Items] |  |  |
Unfunded commitment | 7,400 | 8,600 |
Other Investments |  |  |
Other Commitments [Line Items] |  |  |
Unfunded commitment | 20,500 | 9,800 |
Commitments to extend credit |  |  |
Other Commitments [Line Items] |  |  |
Fixed Rate | 65,639 | 50,193 |
Variable Rate | 164,455 | 180,696 |
Unused lines of credit |  |  |
Other Commitments [Line Items] |  |  |
Fixed Rate | 46,747 | 8,392 |
Variable Rate | 1,365,588 | 1,505,122 |
Letters of credit |  |  |
Other Commitments [Line Items] |  |  |
Fixed Rate | 1,673 | 2,461 |
Variable Rate | $ 8,886 | $ 7,016 |

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