DERIVATIVE INSTRUMENTS - Summary of Characteristics of Interest Rate Swaps (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023
Interest rate swaps, at fair value
Derivative [Line Items]
Current notional	$ 66,053,571	$ 58,829,554
Weighted Average Pay Rate	3.11%	3.04%
Weighted Average Receive Rate	4.50%	5.31%
Weighted Average Years to Maturity	4 years 4 months 9 days	5 years 4 months 9 days
Interest rate swaps, at fair value | Federal Funds Rate
Derivative [Line Items]
Nonmonetary notional amount, percentage	0.05	0.06
Interest rate swaps, at fair value | Secured Overnight Financing Rate
Derivative [Line Items]
Nonmonetary notional amount, percentage	0.95	0.94
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	$ 30,411,229	$ 21,397,358
Weighted Average Pay Rate	3.49%	3.17%
Weighted Average Receive Rate	4.48%	5.26%
Weighted Average Years to Maturity	1 year 1 month 20 days	1 year 2 months 23 days
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	$ 12,764,021	$ 12,461,799
Weighted Average Pay Rate	3.15%	3.09%
Weighted Average Receive Rate	4.50%	5.37%
Weighted Average Years to Maturity	4 years 3 months 7 days	4 years 9 months
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	$ 21,318,937	$ 22,949,150
Weighted Average Pay Rate	2.55%	2.85%
Weighted Average Receive Rate	4.53%	5.34%
Weighted Average Years to Maturity	7 years 7 months 17 days	8 years 7 days
Interest rate swaps, at fair value | Greater than 10 years
Derivative [Line Items]
Minimum Maturity Period	10 years	10 years
Current notional	$ 1,559,384	$ 2,021,247
Weighted Average Pay Rate	3.40%	3.53%
Weighted Average Receive Rate	4.41%	5.27%
Weighted Average Years to Maturity	23 years 3 months	22 years 8 months 15 days
Forward Starting Pay Fixed Swaps
Derivative [Line Items]
Current notional	$ 0	$ 0