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Investment Securities - Amortized Cost and Fair Value of Investment Securities Pledged as Collateral (Details) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Amortized Cost | $ 910,177 | $ 1,137,794
Fair Value | 789,093 | 1,016,108
State and local governments public deposits |  |
Amortized Cost | 235,829 | 238,060
Fair Value | 219,951 | 224,879
FRB |  |
Amortized Cost | 619,972 | 845,098
Fair Value | 520,685 | 742,197
Other securities pledged |  |
Amortized Cost | 54,376 | 54,636
Fair Value | $ 48,457 | $ 49,032

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