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DERIVATIVE INSTRUMENTS - Summary of Characteristics of Interest Rate Swaps (Details) - USD ($)
$ in Thousands
 9 Months Ended 12 Months Ended
Sep. 30, 2023
Dec. 31, 2022
Interest rate swaps, at fair value    
Derivative [Line Items]    
Current Notional $ 57,719,554 $ 52,277,300
Weighted Average Pay Rate 2.61% 1.74%
Weighted Average Receive Rate 5.27% 4.28%
Weighted average years to maturity 5 years 8 months 4 days 5 years 3 months
Interest rate swaps, at fair value | LIBOR    
Derivative [Line Items]    
Notional amount, percentage   0.17
Interest rate swaps, at fair value | Federal funds index swap    
Derivative [Line Items]    
Notional amount, percentage 0.11 0.23
Interest rate swaps, at fair value | Secured Overnight Financing Rate    
Derivative [Line Items]    
Notional amount, percentage 0.89 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 $ 18,782,358 $ 26,355,700
Weighted Average Pay Rate 2.28% 0.88%
Weighted Average Receive Rate 5.20% 4.33%
Weighted average years to maturity 9 months 3 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 $ 7,964,799 $ 1,120,400
Weighted Average Pay Rate 2.89% 2.53%
Weighted Average Receive Rate 5.30% 3.95%
Weighted average years to maturity 4 years 4 months 9 days 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 $ 28,331,637 $ 22,492,200
Weighted Average Pay Rate 2.71% 2.54%
Weighted Average Receive Rate 5.33% 4.24%
Weighted average years to maturity 7 years 10 months 20 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 $ 2,640,760 $ 2,309,000
Weighted Average Pay Rate 3.63% 3.49%
Weighted Average Receive Rate 5.24% 4.26%
Weighted average years to maturity 20 years 10 months 9 days 22 years 11 months 4 days
Forward starting pay fixed swaps    
Derivative [Line Items]    
Current Notional $ 734,000 $ 0