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DERIVATIVE INSTRUMENTS - Amount and Market Value of Mortgage Banking Derivatives (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Jul. 25, 2023 | Dec. 31, 2022
--- | --- | --- | ---
Derivatives, Fair Value [Line Items] |  |  |
Derivatives asset, notional amount | $ 5,233,632 |  | $ 39,579
Derivatives asset, Fair Value | 70,625 |  | 2,292
Derivative liabilities, Notional Amount | 36,763 |  | 39,579
Derivative liabilities, Fair Value | 2,799 |  | 2,251
Contingent forward loan sale agreement |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivatives asset, notional amount | 1,803,869 | $ 1,800,000 | 0
Derivatives asset, Fair Value | 34,902 |  | 0
Interest rate swaptions |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivatives asset, notional amount | 3,093,000 |  | 0
Derivatives asset, Fair Value | 27,003 |  | 0
Cash flow hedges |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivatives asset, notional amount | 300,000 |  | 0
Derivatives asset, Fair Value | 5,874 |  | 0
Interest rate swaps on loans |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivatives asset, notional amount | 32,166 |  | 33,694
Derivatives asset, Fair Value | 2,708 |  | 2,134
Derivative liabilities, Notional Amount | 32,166 |  | 33,694
Derivative liabilities, Fair Value | 2,669 |  | 2,107
Foreign exchange contracts |  |  |
Derivatives, Fair Value [Line Items] |  |  |
Derivatives asset, notional amount | 4,597 |  | 5,885
Derivatives asset, Fair Value | 138 |  | 158
Derivative liabilities, Notional Amount | 4,597 |  | 5,885
Derivative liabilities, Fair Value | $ 130 |  | $ 144

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