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, 2022	Dec. 31, 2021
Notional Disclosures [Abstract]
Notional Amount	$ 20,416,319	$ 17,547,367
Asset
Asset	30,011	19,139
Collateral (held)/pledged	0	0
Net amount	30,011	19,139
(Liability)
(Liability)	(127,983)	(34,248)
Collateral (held)/pledged	288,224	194,519
Net amount	160,241	160,271
Designated as hedge | Fair value hedges: | Pay fixed non-callable
Notional Disclosures [Abstract]
Notional Amount	7,292,155	6,238,438
Asset
Asset	6,060	11,554
(Liability)
(Liability)	$ (1,665)	$ (583)
Weighted- Average Pay Rate	2.07%	2.06%
Weighted- Average Receive Rate	1.44%	0.13%
Weighted- Average Remaining Term (in years)	11 years 6 months 25 days	11 years 7 months 20 days
Designated as hedge | Fair value hedges: | Receive fixed non-callable
Notional Disclosures [Abstract]
Notional Amount	$ 7,686,279	$ 5,884,529
Asset
Asset	1,971	15
(Liability)
(Liability)	$ (7,136)	$ (8,383)
Weighted- Average Pay Rate	1.44%	0.17%
Weighted- Average Receive Rate	1.20%	0.88%
Weighted- Average Remaining Term (in years)	1 year 11 months 26 days	2 years 3 months 7 days
Designated as hedge | Fair value hedges: | Receive fixed callable
Notional Disclosures [Abstract]
Notional Amount	$ 1,993,577	$ 1,571,577
Asset
Asset	0	103
(Liability)
(Liability)	$ (117,102)	$ (17,612)
Weighted- Average Pay Rate	1.32%	0.01%
Weighted- Average Receive Rate	1.17%	0.80%
Weighted- Average Remaining Term (in years)	3 years 7 months 28 days	4 years 2 months 1 day
Designated as hedge | Cash flow hedges: | Pay fixed non-callable
Notional Disclosures [Abstract]
Notional Amount	$ 617,000	$ 570,000
Asset
Asset	21,061	6,905
(Liability)
(Liability)	$ (102)	$ (2,763)
Weighted- Average Pay Rate	1.94%	1.93%
Weighted- Average Receive Rate	1.89%	0.49%
Weighted- Average Remaining Term (in years)	5 years 4 months 20 days	5 years 8 months 19 days
No hedge designation
Asset
Credit valuation adjustment	$ 0	$ 0
(Liability)
Credit valuation adjustment	15	14
No hedge designation | Pay fixed non-callable
Notional Disclosures [Abstract]
Notional Amount	211,147	229,062
Asset
Asset	317	0
(Liability)
(Liability)	$ (463)	$ (4,641)
Weighted- Average Pay Rate	3.26%	3.22%
Weighted- Average Receive Rate	1.23%	0.16%
Weighted- Average Remaining Term (in years)	4 years 6 months 21 days	4 years 11 months 12 days
No hedge designation | Receive fixed non-callable
Notional Disclosures [Abstract]
Notional Amount	$ 724,750	$ 1,377,250
Asset
Asset	0	0
(Liability)
(Liability)	$ 0	$ 0
Weighted- Average Pay Rate	1.43%	0.13%
Weighted- Average Receive Rate	0.36%	0.43%
Weighted- Average Remaining Term (in years)	11 months 23 days	11 months 19 days
No hedge designation | Basis swaps
Notional Disclosures [Abstract]
Notional Amount	$ 1,793,911	$ 1,608,911
Asset
Asset	252	489
(Liability)
(Liability)	$ (484)	$ (280)
Weighted- Average Pay Rate	1.26%	0.17%
Weighted- Average Receive Rate	1.44%	0.20%
Weighted- Average Remaining Term (in years)	2 years 9 months 18 days	3 years 3 months 21 days
No hedge designation | Treasury futures
Notional Disclosures [Abstract]
Notional Amount	$ 97,500	$ 67,600
Asset
Asset	350	73
(Liability)
(Liability)	$ (1,046)	$ 0
Weighted- Average Forward Price (in dollars per share)	$ 117.82	$ 130.58