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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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