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DERIVATIVE INSTRUMENTS - Summary of Characteristics of Interest Rate Swaps (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Interest rate swaps, at fair value    
Derivative [Line Items]    
Current notional $ 58,829,554 $ 52,277,300
Weighted Average Pay Rate 3.04% 1.74%
Weighted Average Receive Rate 5.31% 4.28%
Weighted Average Years to Maturity 5 years 4 months 9 days 5 years 3 months
Interest rate swaps, at fair value | LIBOR    
Derivative [Line Items]    
Nonmonetary notional amount, percentage   0.17
Interest rate swaps, at fair value | Federal Funds Rate    
Derivative [Line Items]    
Nonmonetary notional amount, percentage 0.06 0.23
Interest rate swaps, at fair value | Secured Overnight Financing Rate    
Derivative [Line Items]    
Nonmonetary notional amount, percentage 0.94 0.60
Interest rate swaps, at fair value | 0 - 3 years    
Derivative [Line Items]    
Minimum Maturity Period 0 years 0 years
Maximum Maturity Period 3 years 3 years
Current notional $ 21,397,358 $ 26,355,700
Weighted Average Pay Rate 3.17% 0.88%
Weighted Average Receive Rate 5.26% 4.33%
Weighted Average Years to Maturity 1 year 2 months 23 days 9 months
Interest rate swaps, at fair value | 3 - 6 years    
Derivative [Line Items]    
Minimum Maturity Period 3 years 3 years
Maximum Maturity Period 6 years 6 years
Current notional $ 12,461,799 $ 1,120,400
Weighted Average Pay Rate 3.09% 2.53%
Weighted Average Receive Rate 5.37% 3.95%
Weighted Average Years to Maturity 4 years 9 months 4 years 25 days
Interest rate swaps, at fair value | 6 - 10 years    
Derivative [Line Items]    
Minimum Maturity Period 6 years 6 years
Maximum Maturity Period 10 years 10 years
Current notional $ 22,949,150 $ 22,492,200
Weighted Average Pay Rate 2.85% 2.54%
Weighted Average Receive Rate 5.34% 4.24%
Weighted Average Years to Maturity 8 years 7 days 8 years 9 months 3 days
Interest rate swaps, at fair value | Greater than 10 years    
Derivative [Line Items]    
Minimum Maturity Period 10 years 10 years
Current notional $ 2,021,247 $ 2,309,000
Weighted Average Pay Rate 3.53% 3.49%
Weighted Average Receive Rate 5.27% 4.26%
Weighted Average Years to Maturity 22 years 8 months 15 days 22 years 11 months 4 days
Forward Starting Pay Fixed Swaps    
Derivative [Line Items]    
Current notional $ 0 $ 0