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Investment Securities - Amortized Cost and Fair Value of Investment Securities Pledged as Collateral (Details) - USD ($) $ in Thousands | Sep. 30, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost | $ 724,246 | $ 1,137,794
Fair Value | 666,252 | 1,016,108
State and local governments public deposits |  |
Amortized Cost | 232,915 | 238,060
Fair Value | 225,360 | 224,879
FRB |  |
Amortized Cost | 437,490 | 845,098
Fair Value | 391,119 | 742,197
Other securities pledged |  |
Amortized Cost | 53,841 | 54,636
Fair Value | $ 49,773 | $ 49,032

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