DERIVATIVE INSTRUMENTS - Summary of Characteristics of Interest Rate Swaps (Details) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2023	Dec. 31, 2022
Interest rate swaps, at fair value
Derivative [Line Items]
Current Notional	$ 64,730,400,000	$ 52,277,300,000
Weighted Average Pay Rate	2.13%	1.74%
Weighted Average Receive Rate	4.87%	4.28%
Weighted average years to maturity	5 years 2 months 4 days	5 years 3 months
Interest rate swaps, at fair value | LIBOR
Derivative [Line Items]
Notional amount, percentage	0.13	0.17
Interest rate swaps, at fair value | Federal funds index swap
Derivative [Line Items]
Notional amount, percentage	0.19	0.23
Interest rate swaps, at fair value | Secured Overnight Financing Rate
Derivative [Line Items]
Notional amount, percentage	0.68	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	$ 28,739,600,000	$ 26,355,700,000
Weighted Average Pay Rate	1.40%	0.88%
Weighted Average Receive Rate	4.85%	4.33%
Weighted average years to maturity	1 year 1 month 2 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	$ 7,393,000,000	$ 1,120,400,000
Weighted Average Pay Rate	2.93%	2.53%
Weighted Average Receive Rate	4.86%	3.95%
Weighted average years to maturity	4 years 9 months 25 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	$ 26,163,800,000	$ 22,492,200,000
Weighted Average Pay Rate	2.59%	2.54%
Weighted Average Receive Rate	4.88%	4.24%
Weighted average years to maturity	8 years 2 months 19 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	$ 2,434,000,000	$ 2,309,000,000
Weighted Average Pay Rate	3.46%	3.49%
Weighted Average Receive Rate	4.82%	4.26%
Weighted average years to maturity	21 years 10 months 13 days	22 years 11 months 4 days
Forward starting pay fixed swaps
Derivative [Line Items]
Current Notional	$ 0	$ 0