Components of Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2020	Dec. 31, 2019
Accumulated Other Comprehensive Income Loss [Line Items]
Other comprehensive income (loss), net of tax	$ 148	$ 8,155
Unrealized gains (losses) on available for sale securities, net
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss) beginning balance	20	(291)
Other comprehensive income (loss), net of tax	148	311
Accumulated other comprehensive income (loss) ending balance	168	20
Unrealized losses on pension benefits, net
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss) beginning balance		(7,844)
Other comprehensive income (loss), net of tax		7,844
Accumulated Other Comprehensive Income (Loss)
Accumulated Other Comprehensive Income Loss [Line Items]
Accumulated other comprehensive income (loss) beginning balance	20	(8,135)
Accumulated other comprehensive income (loss) ending balance	$ 168	$ 20