DERIVATIVE INSTRUMENTS - Summary of Characteristics of Interest Rate Swaps (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2025	Dec. 31, 2024
Interest rate swaps, at fair value
Derivative [Line Items]
Current Notional	$ 57,053,898	$ 66,053,571
Weighted Average Pay Rate	3.14%	3.11%
Weighted Average Receive Rate	4.47%	4.50%
Weighted Average Years to Maturity	4 years 10 months 17 days	4 years 4 months 9 days
Interest rate swaps, at fair value | Federal funds index swap
Derivative [Line Items]
Notional amount, percentage	2.00%	5.00%
Interest rate swaps, at fair value | Secured Overnight Financing Rate
Derivative [Line Items]
Notional amount, percentage	98.00%	95.00%
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	$ 23,100,137	$ 30,411,229
Weighted Average Pay Rate	3.60%	3.49%
Weighted Average Receive Rate	4.45%	4.48%
Weighted Average Years to Maturity	1 year 7 months 17 days	1 year 1 month 20 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	$ 12,264,904	$ 12,764,021
Weighted Average Pay Rate	2.98%	3.15%
Weighted Average Receive Rate	4.45%	4.50%
Weighted Average Years to Maturity	4 years 7 months 6 days	4 years 3 months 7 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	$ 19,739,427	$ 21,318,937
Weighted Average Pay Rate	2.75%	2.55%
Weighted Average Receive Rate	4.50%	4.53%
Weighted Average Years to Maturity	7 years 4 months 13 days	7 years 7 months 17 days
Interest rate swaps, at fair value | Greater than 10 years
Derivative [Line Items]
Minimum maturity period	10 years	10 years
Current Notional	$ 1,949,430	$ 1,559,384
Weighted Average Pay Rate	3.39%	3.40%
Weighted Average Receive Rate	4.45%	4.41%
Weighted Average Years to Maturity	22 years 6 months 7 days	23 years 3 months
Forward starting pay fixed swaps
Derivative [Line Items]
Current Notional	$ 1,600,000	$ 0