Other Comprehensive Income - Activity in AOCI, net of tax (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Other Comprehensive Income Loss Net Of Tax Period Increase Decrease [Abstract]
Securities Available For Sale, Beginning balance	$ 4,839	$ (2,057)
Securities Available For Sale, Other comprehensive income before reclassifications	7,473	3,635
Securities Available For Sale, Net other comprehensive income during period	7,473	3,635
Securities Available For Sale, Ending balance	12,312	1,578
Post-retirement Benefit, Beginning balance	(244)	(91)
Post-retirement Benefit, Amounts reclassified from accumulated other comprehensive income		82
Post-retirement Benefit, Net other comprehensive income during period		82
Post-retirement Benefit, Ending balance	(244)	(9)
Accumulated Other Comprehensive Income (Loss), Beginning balance	4,595	(2,148)
Accumulated Other Comprehensive Income (Loss), Other comprehensive income before reclassifications	7,473	3,635
Accumulated Other Comprehensive Income (Loss), Amounts reclassified from accumulated other comprehensive income		82
Accumulated Other Comprehensive Income (Loss), Net other comprehensive income during period	7,473	3,717
Accumulated Other Comprehensive Income (Loss), Ending balance	$ 12,068	$ 1,569