Investment Securities - Total Gross Proceeds from Sales of Securities (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Available for sale (AFS):
Available-for-sale securities, gross realized gains	$ 1	$ 0	$ 146	$ 14
State and political securities
Available for sale (AFS):
Available-for-sale securities, gross realized gains	1	0	146	14
Available-for-sale securities, gross realized losses	(46)	(156)	(271)	(182)
Other debt securities
Available for sale (AFS):
Available-for-sale securities, gross realized gains	$ 0	$ 0	$ 0	$ 0