Investment Securities - Allowance for Credit Losses HTM (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Held-to-maturity
Beginning balance	$ 1,888	$ 1,377	$ 1,388	$ 1,279
Provision for credit loss expense	1,326	0	1,826	0
Net increase (decrease) in allowance on previously impaired securities	1,326	0	1,326	0
Recoveries		4		102
Ending balance	3,214	1,381	3,214	1,381
Securities charged-off	0		(7,000)
State and political subdivisions
Held-to-maturity
Beginning balance	362	1,285	110	1,197
Provision for credit loss expense	572	0	824	0
Net increase (decrease) in allowance on previously impaired securities	0	(1,183)	0	(1,183)
Recoveries		1		89
Ending balance	934	103	934	103
Securities charged-off	0		0
Other securities
Held-to-maturity
Beginning balance	1,526	92	1,278	82
Provision for credit loss expense	754	0	1,002	0
Net increase (decrease) in allowance on previously impaired securities	1,326	1,183	1,326	1,183
Recoveries		3		13
Ending balance	2,280	$ 1,278	2,280	$ 1,278
Securities charged-off	$ 0		$ (7,000)