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Investment Securities - Amortized Cost and Fair Value of Investment Securities Pledged as Collateral (Details) - USD ($) $ in Thousands | Sep. 30, 2023 | Dec. 31, 2022
--- | --- | ---
Amortized Cost | $ 1,177,323 | $ 336,039
Fair Value | 1,003,933 | 291,631
State and local governments public deposits |  |
Amortized Cost | 242,616 | 156,784
Fair Value | 220,348 | 137,931
FRB |  |
Amortized Cost | 852,720 | 60,660
Fair Value | 712,009 | 49,506
Securities sold under agreement to repurchase |  |
Amortized Cost | 28,104 | 63,685
Fair Value | 25,654 | 55,836
Other securities pledged |  |
Amortized Cost | 53,883 | 54,910
Fair Value | $ 45,922 | $ 48,358

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