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DERIVATIVES AND HEDGING - Schedule of Derivatives and Hedges of Notional Amounts (Details) - Not Designated as Hedging Instrument - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2024
Dec. 31, 2023
Interest rate swaps    
Derivative [Line Items]    
Derivative asset, notional amount $ 7,745,000 $ 7,979,988
Interest rate swaps | TBAs, Short Position    
Derivative [Line Items]    
Notional amount $ 5,900,000 $ 0
Derivative, cap interest rate 3.70% 0.00%
Weighted average maturity 48 months 0 months
Interest rate swaps | TBAs, Long Position    
Derivative [Line Items]    
Notional amount $ 1,800,000 $ 8,000,000
Derivative, cap interest rate 3.30% 2.50%
Weighted average maturity 85 months 32 months
IRLCs    
Derivative [Line Items]    
Derivative asset, notional amount $ 4,585,355 $ 2,757,060
Treasury Short Sales    
Derivative [Line Items]    
Derivative liability, notional amount 0 1,800,000
TBAs    
Derivative [Line Items]    
Derivative liability, notional amount 15,666,500 6,013,100
Other commitments    
Derivative [Line Items]    
Derivative liability, notional amount 25,057 0
Foreign exchange forwards    
Derivative [Line Items]    
Derivative liability, notional amount $ 16,000 $ 0