Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss)
Net unrealized gain on securities available-for-sale	$ 11,556	$ 14,561
Net unrealized loss for unfunded status of defined benefit plan liability	(2,810)	(2,810)
Accumulated other comprehensive income, before taxes, total	8,746	11,751
Tax effect	1,836	2,468
Net-of-tax amount	$ 6,910	$ 9,283