Investment Securities - Allowance for Credit Losses HTM (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Held-to-maturity
Beginning balance	$ 1,388	$ 1,279
Provision for credit loss expense	500	0
Recoveries		98
Ending balance	1,888	1,377
State and political subdivisions
Held-to-maturity
Beginning balance	110	1,197
Provision for credit loss expense	252	0
Recoveries		88
Ending balance	362	1,285
Other securities
Held-to-maturity
Beginning balance	1,278	82
Provision for credit loss expense	248	0
Recoveries		10
Ending balance	$ 1,526	$ 92