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Securities - Schedule of Information Regarding Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair Value, AFS and HTM | $ 2,271,122 | $ 2,023,736
Unrealized Losses, AFS and HTM | 182,246 | 30,297
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair Value, AFS and HTM | 791,655 | 487,570
Unrealized Losses, AFS and HTM | 86,135 | 18,031
Total |  |
Fair Value, AFS and HTM | 3,062,777 | 2,511,306
Unrealized Losses, AFS and HTM | 268,381 | 48,328
US Treasuries |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair Value, AFS | 149,391 |
Unrealized Losses, AFS | 143 |
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair Value, AFS | 0 |
Unrealized Losses, AFS | 0 |
Total |  |
Fair Value, AFS | 149,391 |
Unrealized Losses, AFS | 143 |
Government-sponsored enterprise securities |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair Value, AFS | 19,855 | 21,436
Unrealized Losses, AFS | 2,104 | 522
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair Value, AFS | 44,313 | 47,743
Unrealized Losses, AFS | 5,681 | 2,250
Total |  |
Fair Value, AFS | 64,168 | 69,179
Unrealized Losses, AFS | 7,785 | 2,772
Mortgage-backed securities |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair Value, AFS and HTM | 1,656,529 | 1,773,022
Unrealized Losses, AFS and HTM | 133,422 | 25,977
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair Value, AFS and HTM | 705,932 | 404,484
Unrealized Losses, AFS and HTM | 73,220 | 13,857
Total |  |
Fair Value, AFS and HTM | 2,362,461 | 2,177,506
Unrealized Losses, AFS and HTM | 206,642 | 39,834
Corporate bonds |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair Value, AFS | 13,914 | 999
Unrealized Losses, AFS | 86 | 1
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair Value, AFS | 928 | 945
Unrealized Losses, AFS | 72 | 55
Total |  |
Fair Value, AFS | 14,842 | 1,944
Unrealized Losses, AFS | 158 | 56
State and local governments |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair Value, HTM | 431,433 | 228,279
Unrealized Losses, HTM | 46,491 | 3,797
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair Value, HTM | 40,482 | 34,398
Unrealized Losses, HTM | 7,162 | 1,869
Total |  |
Fair Value, HTM | 471,915 | 262,677
Unrealized Losses, HTM | $ 53,653 | $ 5,666

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