Investment Securities - Allowance for Credit Losses HTM (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 1,388	$ 1,279
Provision for credit loss expense	1,826	0	$ (1,183)
Net increase (decrease) in allowance on previously impaired securities	0	0
Recoveries		109
Ending balance	3,214	1,388	1,279
State and political subdivisions
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Beginning balance	110	1,197
Provision for credit loss expense	824	0
Net increase (decrease) in allowance on previously impaired securities	1,072	(1,180)
Recoveries		93
Ending balance	2,006	110	1,197
Other securities
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,278	82
Provision for credit loss expense	1,002	0
Net increase (decrease) in allowance on previously impaired securities	(1,072)	1,180
Recoveries		16
Ending balance	$ 1,208	$ 1,278	$ 82