Investment Securities - Allowance for Credit Losses HTM (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 1,279	$ 2,915
Provision for credit loss expense	0	(1,183)	$ 2,546
Net decrease in allowance on previously impaired securities	0	(301)
Net increase (decrease) in allowance on previously impaired securities		(600)
Recoveries	109	147
Ending balance	1,388	1,279	2,915
State and political subdivisions
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Beginning balance	1,197	2,307
Provision for credit loss expense	0	(1,110)
Net decrease in allowance on previously impaired securities	(1,180)	(217)
Net increase (decrease) in allowance on previously impaired securities		0
Recoveries	93	0
Ending balance	110	1,197	2,307
Other securities
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Beginning balance	82	608
Provision for credit loss expense	0	(73)
Net decrease in allowance on previously impaired securities	1,180	(84)
Net increase (decrease) in allowance on previously impaired securities		(600)
Recoveries	16	147
Ending balance	$ 1,278	$ 82	$ 608