reconciliation of the changes in the components of other comprehensive income (loss) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Other comprehensive income (loss)
Net unrealized gains (losses) on securities available-for-sale	$ 2,280	$ 2,258	$ (202)
Unrealized gains (losses) on securities available-for-sale	2,084	1,995	(520)
Other comprehensive income (loss)	1,647	1,577	(415)
Other Comprehensive Income (Loss) [Member]
Other comprehensive income (loss)
Net unrealized gains (losses) on securities available-for-sale	2,280	2,258	(202)
Reclassification of net realized gains in net income (1)	(196)	(263)	(318)
Unrealized gains (losses) on securities available-for-sale	2,084	1,995	(520)
Income tax (expense) benefit	(437)	(418)	105
Unrealized gains (losses) on securities available-for-sale, net of tax	1,647	1,577	(415)
Other comprehensive income (loss)	$ 1,647	$ 1,577	$ (415)