Income Taxes - Components of Provision for Income Taxes (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Income Taxes
Taxes currently payable									$ 557	$ 425
Deferred Income Tax Expense (Benefit)									42	375
Provision for Federal Income Taxes	$ 89	$ 135	$ 188	$ 187	$ 83	$ 269	$ 250	$ 198	$ 599	$ 800