Investment Securities - Allowance for Credit Losses HTM (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Held-to-maturity
Beginning balance	$ 3,214	$ 1,381	$ 1,388	$ 1,279
Provision for credit loss expense	0	0	1,826	0
Net increase (decrease) in allowance on previously impaired securities	0	0	0	0
Recoveries		3		105
Ending balance	3,214	1,384	3,214	1,384
State and political subdivisions
Held-to-maturity
Beginning balance	934	103	110	1,197
Provision for credit loss expense	0	0	824	0
Net increase (decrease) in allowance on previously impaired securities	586	3	586	(1,180)
Recoveries		1		90
Ending balance	1,520	107	1,520	107
Other securities
Held-to-maturity
Beginning balance	2,280	1,278	1,278	82
Provision for credit loss expense	0	0	1,002	0
Net increase (decrease) in allowance on previously impaired securities	(586)	(3)	(586)	1,180
Recoveries		2		15
Ending balance	$ 1,694	$ 1,277	$ 1,694	$ 1,277