DERIVATIVE INSTRUMENTS - Summary of Characteristics of Interest Rate Swaps (Details) - Interest rate swaps, at fair value - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024
Derivative [Line Items]
Current Notional	$ 55,452,768	$ 66,053,571
Weighted Average Pay Rate	2.98%	3.11%
Weighted Average Receive Rate	4.43%	4.50%
Weighted Average Years to Maturity	4 years 9 months 14 days	4 years 4 months 9 days
Federal funds index swap
Derivative [Line Items]
Notional amount, percentage	7.00%	5.00%
Secured Overnight Financing Rate
Derivative [Line Items]
Notional amount, percentage	93.00%	95.00%
0 - 3 years
Derivative [Line Items]
Minimum maturity period	0 years	0 years
Maximum maturity period	3 years	3 years
Current Notional	$ 25,483,937	$ 30,411,229
Weighted Average Pay Rate	3.27%	3.49%
Weighted Average Receive Rate	4.40%	4.48%
Weighted Average Years to Maturity	1 year 8 months 19 days	1 year 1 month 20 days
3 - 6 years
Derivative [Line Items]
Minimum maturity period	3 years	3 years
Maximum maturity period	6 years	6 years
Current Notional	$ 8,678,730	$ 12,764,021
Weighted Average Pay Rate	2.96%	3.15%
Weighted Average Receive Rate	4.41%	4.50%
Weighted Average Years to Maturity	4 years 7 months 9 days	4 years 3 months 7 days
6 - 10 years
Derivative [Line Items]
Minimum maturity period	6 years	6 years
Maximum maturity period	10 years	10 years
Current Notional	$ 19,698,720	$ 21,318,937
Weighted Average Pay Rate	2.61%	2.55%
Weighted Average Receive Rate	4.48%	4.53%
Weighted Average Years to Maturity	7 years 4 months 13 days	7 years 7 months 17 days
Greater than 10 years
Derivative [Line Items]
Minimum maturity period	10 years	10 years
Current Notional	$ 1,591,381	$ 1,559,384
Weighted Average Pay Rate	3.38%	3.40%
Weighted Average Receive Rate	4.41%	4.41%
Weighted Average Years to Maturity	22 years 11 months 15 days	23 years 3 months