Investment Securities - Allowance for Credit Losses HTM (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Beginning balance	$ 2,915	$ 0
Provision for credit loss expense	(1,183)	2,546	$ 0
Securities charged-off	(600)
Recoveries	147
Ending balance	1,279	2,915	0
State and political subdivisions
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Beginning balance	2,307	0
Provision for credit loss expense	(1,110)	2,249
Securities charged-off	0
Recoveries	0
Ending balance	1,197	2,307	0
Other securities
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Beginning balance	608	0
Provision for credit loss expense	(73)	297
Securities charged-off	(600)
Recoveries	147
Ending balance	$ 82	608	0
Cumulative Effect, Period of Adoption, Adjustment
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Beginning balance		369
Ending balance			369
Cumulative Effect, Period of Adoption, Adjustment | State and political subdivisions
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Beginning balance		58
Ending balance			58
Cumulative Effect, Period of Adoption, Adjustment | Other securities
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Roll Forward]
Beginning balance		$ 311
Ending balance			$ 311