Investment Securities - Debt Securities, Held-to-Maturity, Allowance for Credit Loss (Details) - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Allowance for credit losses:
Beginning balance	$ 434	$ 0
Credit loss reduction	(285)	(10)
Securities charged-off	0	0
Recoveries	0	0
Total ending allowance balance	149	428
Credit loss reduction	285	10
Impact of adopting ASC 326
Allowance for credit losses:
Beginning balance		438
State and political subdivisions
Allowance for credit losses:
Beginning balance	222	0
Credit loss reduction	(129)	(5)
Securities charged-off	0	0
Recoveries	0	0
Total ending allowance balance	93	224
Credit loss reduction	129	5
State and political subdivisions | Impact of adopting ASC 326
Allowance for credit losses:
Beginning balance		229
Corporate securities
Allowance for credit losses:
Beginning balance	212	0
Credit loss reduction	(156)	(5)
Securities charged-off	0	0
Recoveries	0	0
Total ending allowance balance	56	204
Credit loss reduction	$ 156	5
Corporate securities | Impact of adopting ASC 326
Allowance for credit losses:
Beginning balance		$ 209