Investment Securities - Total Gross Proceeds from Sales of Securities (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Available for sale (AFS):
Available-for-sale securities, gross realized gains	$ 186	$ 0	$ 207	$ 19
Available-for-sale securities, gross realized losses	0	2	0	8
Mortgage-backed securities
Available for sale (AFS):
Available-for-sale securities, gross realized gains		0	83	0
State and political securities
Available for sale (AFS):
Available-for-sale securities, gross realized gains	103	0	104	15
Available-for-sale securities, gross realized losses	0	1	0	3
Other debt securities
Available for sale (AFS):
Available-for-sale securities, gross realized gains	0	0	20	4
Available-for-sale securities, gross realized losses	$ 0	$ 1	$ 0	$ 5