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Securities - Schedule of Information Regarding Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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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

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