Financial Derivatives - Schedule of Derivative Instruments in Statement of Financial Position (Details) - USD ($) $ / shares in Units, $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2023	Dec. 31, 2022
Notional Disclosures [Abstract]
Notional Amount	$ 25,278,476	$ 23,878,611
Asset
Fair value, asset	26,824	37,409
Netting adjustments	(2,675)	(5,212)
(Liability)
Fair value, liability	(188,652)	(175,326)
Netting adjustments	2,675	5,212
Designated as hedge | Fair value hedges: | Receive fixed non-callable
Notional Disclosures [Abstract]
Notional Amount	9,858,235	8,149,871
Asset
Fair value, asset	2,520	13,689
(Liability)
Fair value, liability	$ (14)	$ (366)
Weighted- Average Pay Rate	5.16%	2.23%
Weighted- Average Receive Rate	2.50%	4.33%
Weighted- Average Remaining Term (in years)	1 year 7 months 6 days	10 years 9 months 3 days
Designated as hedge | Fair value hedges: | Pay fixed non-callable
Notional Disclosures [Abstract]
Notional Amount	$ 8,704,710	$ 10,033,750
Asset
Fair value, asset	61	19
(Liability)
Fair value, liability	$ (14,237)	$ (4,686)
Weighted- Average Pay Rate	2.36%	4.31%
Weighted- Average Receive Rate	5.19%	2.03%
Weighted- Average Remaining Term (in years)	10 years 2 months 23 days	1 year 7 months 20 days
Designated as hedge | Fair value hedges: | Receive fixed callable
Notional Disclosures [Abstract]
Notional Amount	$ 3,716,577	$ 2,764,577
Asset
Fair value, asset	0	461
(Liability)
Fair value, liability	$ (176,165)	$ (174,757)
Weighted- Average Pay Rate	5.07%	4.21%
Weighted- Average Receive Rate	2.77%	1.98%
Weighted- Average Remaining Term (in years)	2 years 6 months 3 days	3 years 2 months 4 days
Designated as hedge | Cash flow hedges: | Pay fixed non-callable
Notional Disclosures [Abstract]
Notional Amount	$ 570,000	$ 588,000
Asset
Fair value, asset	25,782	27,275
(Liability)
Fair value, liability	$ (292)	$ 0
Weighted- Average Pay Rate	1.93%	1.93%
Weighted- Average Receive Rate	5.54%	4.72%
Weighted- Average Remaining Term (in years)	4 years 8 months 15 days	5 years 18 days
No hedge designation | Receive fixed non-callable
Notional Disclosures [Abstract]
Notional Amount	$ 785,198	$ 287,750
Asset
Fair value, asset	78	0
(Liability)
Fair value, liability	$ (2)	$ (130)
Weighted- Average Pay Rate	5.09%	4.31%
Weighted- Average Receive Rate	4.00%	1.16%
Weighted- Average Remaining Term (in years)	7 months 13 days	1 year 9 months 3 days
No hedge designation | Pay fixed non-callable
Notional Disclosures [Abstract]
Notional Amount	$ 182,072	$ 187,479
Asset
Fair value, asset	931	1,065
(Liability)
Fair value, liability	$ (82)	$ (1)
Weighted- Average Pay Rate	3.00%	3.05%
Weighted- Average Receive Rate	5.27%	4.09%
Weighted- Average Remaining Term (in years)	4 years 1 month 24 days	4 years 6 months 7 days
No hedge designation | Basis swaps
Notional Disclosures [Abstract]
Notional Amount	$ 1,450,384	$ 1,860,384
Asset
Fair value, asset	56	112
(Liability)
Fair value, liability	$ (535)	$ (456)
Weighted- Average Pay Rate	5.19%	4.40%
Weighted- Average Receive Rate	5.18%	4.42%
Weighted- Average Remaining Term (in years)	2 years 7 months 17 days	2 years 5 months 15 days
No hedge designation | Treasury futures
Notional Disclosures [Abstract]
Notional Amount	$ 11,300	$ 6,800
Asset
Fair value, asset	71	0
Netting adjustments	(2,675)	(5,212)
(Liability)
Fair value, liability	0	(142)
Netting adjustments	$ 2,675	$ 5,212
Weighted- Average Forward Price (in dollars per share)	$ 112.89	$ 114.38