Income Taxes - Components of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Federal:
Current	$ 359	$ 237	$ 636	$ 888
Deferred	489	122	120	89
Federal income tax provision (benefit)	848	359	756	977
State and local:
Current	65	53	179	238
Deferred	1,074	(631)	(182)	(1,135)
State and local income tax provision (benefit)	1,139	(578)	(3)	(897)
Valuation allowance	(840)	506	145	887
Provision for income taxes	$ 1,147	$ 287	$ 898	$ 967