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Securities - Schedule of Information Regarding Securities with Unrealized Losses (Details) - USD ($) $ in Thousands | Mar. 31, 2023 | Dec. 31, 2022
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Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair value, AFS and HTM | $ 45,277 | $ 478,793
Unrealized losses, AFS and HTM | 1,539 | 33,147
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair value, AFS and HTM | 2,685,694 | 2,263,197
Unrealized losses, AFS and HTM | 498,139 | 520,099
Total |  |
Fair value, AFS and HTM | 2,730,971 | 2,741,990
Unrealized losses, AFS and HTM | 499,678 | 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 | 170,109 | 0
Unrealized losses, AFS | 4,401 | 0
Total |  |
Fair Value, AFS | 170,109 | 168,758
Unrealized losses, AFS | 4,401 | 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 | 59,304 | 57,456
Unrealized losses, AFS | 12,655 | 14,501
Total |  |
Fair Value, AFS | 59,304 | 57,456
Unrealized losses, AFS | 12,655 | 14,501
Mortgage-backed securities |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair value, AFS and HTM | 41,339 | 221,006
Unrealized losses, AFS and HTM | 1,429 | 18,215
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair value, AFS and HTM | 2,013,372 | 1,835,958
Unrealized losses, AFS and HTM | 389,870 | 405,557
Total |  |
Fair value, AFS and HTM | 2,054,711 | 2,056,964
Unrealized losses, AFS and HTM | 391,299 | 423,772
Corporate bonds |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair value, AFS | 2,816 | 40,644
Unrealized losses, AFS | 107 | 947
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair value, AFS | 13,908 | 886
Unrealized losses, AFS | 1,093 | 114
Total |  |
Fair Value, AFS | 16,724 | 41,530
Unrealized losses, AFS | 1,200 | 1,061
State and local governments |  |
Securities in an Unrealized Loss Position for Less than 12 Months |  |
Fair value, HTM | 1,122 | 48,385
Unrealized losses, HTM | 3 | 8,323
Securities in an Unrealized Loss Position for More than 12 Months |  |
Fair value, HTM | 429,001 | 368,897
Unrealized losses, HTM | 90,120 | 99,927
Total |  |
Fair value, HTM | 430,123 | 417,282
Unrealized losses, HTM | $ 90,123 | $ 108,250

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