Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Changes in accumulated other comprehensive income by component
Balance at the beginning of the period			$ 1,142
Total other comprehensive income	$ 1,729	$ 1,619	1,356	$ 2,603
Balance at the end of the period	2,498		2,498
Amount Reclassified from Accumulated Other Comprehensive Income
Changes in accumulated other comprehensive income by component
Balance at the beginning of the period	769	(360)	1,142	(1,344)
Other comprehensive income before reclassification	1,727	1,622	1,352	2,598
Amount reclassified from accumulated other comprehensive income	2	(3)	4	5
Total other comprehensive income	1,729	1,619	1,356	2,603
Balance at the end of the period	2,498	1,259	2,498	1,259
Amount Reclassified from Accumulated Other Comprehensive Income | Unrealized Gains on Available for Sale Securities
Changes in accumulated other comprehensive income by component
Balance at the beginning of the period	1,011	(121)	1,386	(1,103)
Other comprehensive income before reclassification	1,727	1,622	1,352	2,598
Amount reclassified from accumulated other comprehensive income		(5)		1
Total other comprehensive income	1,727	1,617	1,352	2,599
Balance at the end of the period	2,738	1,496	2,738	1,496
Amount Reclassified from Accumulated Other Comprehensive Income | Amortization of defined benefit items
Changes in accumulated other comprehensive income by component
Balance at the beginning of the period	(242)	(239)	(244)	(241)
Amount reclassified from accumulated other comprehensive income	2	2	4	4
Total other comprehensive income	2	2	4	4
Balance at the end of the period	$ (240)	$ (237)	$ (240)	$ (237)