Securities - Schedule of Information Regarding Securities with Unrealized Losses (Details) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Securities in an Unrealized Loss Position for Less than 12 Months
Fair value, AFS and HTM	$ 1,234,587	$ 2,023,736
Unrealized losses, AFS and HTM	223,143	30,297
Securities in an Unrealized Loss Position for More than 12 Months
Fair value, AFS and HTM	1,514,934	487,570
Unrealized losses, AFS and HTM	367,098	18,031
Total
Fair value, AFS and HTM	2,749,521	2,511,306
Unrealized losses, AFS and HTM	590,241	48,328
U.S. Treasuries
Securities in an Unrealized Loss Position for Less than 12 Months
Fair value, AFS	168,723
Unrealized losses, AFS	5,605
Securities in an Unrealized Loss Position for More than 12 Months
Fair value, AFS	0
Unrealized losses, AFS	0
Total
Fair Value, AFS	168,723
Unrealized losses, AFS	5,605
Government-sponsored enterprise securities
Securities in an Unrealized Loss Position for Less than 12 Months
Fair value, AFS	1,519	21,436
Unrealized losses, AFS	424	522
Securities in an Unrealized Loss Position for More than 12 Months
Fair value, AFS	55,910	47,743
Unrealized losses, AFS	14,103	2,250
Total
Fair Value, AFS	57,429	69,179
Unrealized losses, AFS	14,527	2,772
Mortgage-backed securities
Securities in an Unrealized Loss Position for Less than 12 Months
Fair value, AFS and HTM	770,879	1,773,022
Unrealized losses, AFS and HTM	145,469	25,977
Securities in an Unrealized Loss Position for More than 12 Months
Fair value, AFS and HTM	1,308,825	404,484
Unrealized losses, AFS and HTM	299,191	13,857
Total
Fair value, AFS and HTM	2,079,704	2,177,506
Unrealized losses, AFS and HTM	444,660	39,834
Corporate bonds
Securities in an Unrealized Loss Position for Less than 12 Months
Fair value, AFS	40,633	999
Unrealized losses, AFS	966	1
Securities in an Unrealized Loss Position for More than 12 Months
Fair value, AFS	910	945
Unrealized losses, AFS	90	55
Total
Fair Value, AFS	41,543	1,944
Unrealized losses, AFS	1,056	56
State and local governments
Securities in an Unrealized Loss Position for Less than 12 Months
Fair value, HTM	252,833	228,279
Unrealized losses, HTM	70,679	3,797
Securities in an Unrealized Loss Position for More than 12 Months
Fair value, HTM	149,289	34,398
Unrealized losses, HTM	53,714	1,869
Total
Fair value, HTM	402,122	262,677
Unrealized losses, HTM	$ 124,393	$ 5,666