Deposits - Interest Expense on Deposits (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deposits [Abstract]
Interest-bearing demand accounts	$ 182	$ 8	$ 21
Money market accounts	1,435	855	472
Savings accounts	1,083	744	520
Certificates of deposit $250,000 and greater	1,310	472	480
Certificates of deposit less than $250,000	951	228	214
Total deposits	$ 4,961	$ 2,307	$ 1,707