DERIVATIVE INSTRUMENTS - Summary of Characteristics of Interest Rate Swaps (Details) - USD ($) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Interest rate swaps, at fair value
Derivative [Line Items]
Current Notional	$ 58,987,104	$ 52,277,300
Weighted Average Pay Rate	2.50%	1.74%
Weighted Average Receive Rate	5.05%	4.28%
Weighted average years to maturity	5 years 6 months 29 days	5 years 3 months
Interest rate swaps, at fair value | LIBOR
Derivative [Line Items]
Notional amount, percentage	0.12	0.17
Interest rate swaps, at fair value | Federal funds index swap
Derivative [Line Items]
Notional amount, percentage	0.12	0.23
Interest rate swaps, at fair value | Secured Overnight Financing Rate
Derivative [Line Items]
Notional amount, percentage	0.76	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	$ 21,617,608	$ 26,355,700
Weighted Average Pay Rate	2.02%	0.88%
Weighted Average Receive Rate	5.01%	4.33%
Weighted average years to maturity	10 months 20 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	$ 7,464,799	$ 1,120,400
Weighted Average Pay Rate	2.96%	2.53%
Weighted Average Receive Rate	5.06%	3.95%
Weighted average years to maturity	4 years 6 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	$ 27,823,637	$ 22,492,200
Weighted Average Pay Rate	2.72%	2.54%
Weighted Average Receive Rate	5.12%	4.24%
Weighted average years to maturity	8 years 1 month 6 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	$ 2,081,060	$ 2,309,000
Weighted Average Pay Rate	3.71%	3.49%
Weighted Average Receive Rate	4.84%	4.26%
Weighted average years to maturity	24 years 5 months 4 days	22 years 11 months 4 days
Forward starting pay fixed swaps
Derivative [Line Items]
Current Notional	$ 734,000	$ 0