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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