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Securities - Schedule of Information Regarding Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Jun. 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 | $ 2,102,137 | $ 2,023,736
Unrealized Losses, AFS and HTM | 275,784 | 30,297
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair Value, AFS and HTM | 846,458 | 487,570
Unrealized Losses, AFS and HTM | 141,585 | 18,031
Total |  |
Fair Value, AFS and HTM | 2,948,595 | 2,511,306
Unrealized Losses, AFS and HTM | 417,369 | 48,328
U.S. Treasuries |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair Value, AFS | 172,195 |
Unrealized Losses, AFS | 2,041 |
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair Value, AFS | 0 |
Unrealized Losses, AFS | 0 |
Total |  |
Fair Value, AFS | 172,195 |
Unrealized Losses, AFS | 2,041 |
Government-sponsored enterprise securities |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair Value, AFS | 18,850 | 21,436
Unrealized Losses, AFS | 3,109 | 522
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair Value, AFS | 42,067 | 47,743
Unrealized Losses, AFS | 7,928 | 2,250
Total |  |
Fair Value, AFS | 60,917 | 69,179
Unrealized Losses, AFS | 11,037 | 2,772
Mortgage-backed securities |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair Value, AFS and HTM | 1,505,339 | 1,773,022
Unrealized Losses, AFS and HTM | 189,853 | 25,977
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair Value, AFS and HTM | 761,606 | 404,484
Unrealized Losses, AFS and HTM | 120,612 | 13,857
Total |  |
Fair Value, AFS and HTM | 2,266,945 | 2,177,506
Unrealized Losses, AFS and HTM | 310,465 | 39,834
Corporate bonds |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair Value, AFS | 13,593 | 999
Unrealized Losses, AFS | 407 | 1
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair Value, AFS | 907 | 945
Unrealized Losses, AFS | 93 | 55
Total |  |
Fair Value, AFS | 14,500 | 1,944
Unrealized Losses, AFS | 500 | 56
State and local governments |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair Value, HTM | 392,160 | 228,279
Unrealized Losses, HTM | 80,374 | 3,797
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair Value, HTM | 41,878 | 34,398
Unrealized Losses, HTM | 12,952 | 1,869
Total |  |
Fair Value, HTM | 434,038 | 262,677
Unrealized Losses, HTM | $ 93,326 | $ 5,666

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