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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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