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Securities - Schedule of Information Regarding Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
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Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair value, AFS and HTM | $ 7,772 | $ 478,793
Unrealized losses, AFS and HTM | 308 | 33,147
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair value, AFS and HTM | 2,500,310 | 2,263,197
Unrealized losses, AFS and HTM | 646,491 | 520,099
Total |  |
Fair value, AFS and HTM | 2,508,082 | 2,741,990
Unrealized losses, AFS and HTM | 646,799 | 553,246
U.S. Treasuries |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair value, AFS | 0 | 168,758
Unrealized losses, AFS | 0 | 5,662
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair value, AFS | 170,859 | 0
Unrealized losses, AFS | 3,834 | 0
Total |  |
Fair Value, AFS | 170,859 | 168,758
Unrealized losses, AFS | 3,834 | 5,662
Government-sponsored enterprise securities |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair value, AFS | 0 | 0
Unrealized losses, AFS | 0 | 0
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair value, AFS | 56,904 | 57,456
Unrealized losses, AFS | 15,058 | 14,501
Total |  |
Fair Value, AFS | 56,904 | 57,456
Unrealized losses, AFS | 15,058 | 14,501
Mortgage-backed securities |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair value, AFS and HTM | 1,974 | 221,006
Unrealized losses, AFS and HTM | 12 | 18,215
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair value, AFS and HTM | 1,863,253 | 1,835,958
Unrealized losses, AFS and HTM | 502,357 | 405,557
Total |  |
Fair value, AFS and HTM | 1,865,227 | 2,056,964
Unrealized losses, AFS and HTM | 502,369 | 423,772
Corporate bonds |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair value, AFS | 400 | 40,644
Unrealized losses, AFS | 18 | 947
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair value, AFS | 16,045 | 886
Unrealized losses, AFS | 1,462 | 114
Total |  |
Fair Value, AFS | 16,445 | 41,530
Unrealized losses, AFS | 1,480 | 1,061
State and local governments |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair value, HTM | 5,398 | 48,385
Unrealized losses, HTM | 278 | 8,323
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair value, HTM | 393,249 | 368,897
Unrealized losses, HTM | 123,780 | 99,927
Total |  |
Fair value, HTM | 398,647 | 417,282
Unrealized losses, HTM | $ 124,058 | $ 108,250

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