Parent Company Financial Information - Condensed Income Statement (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Condensed Income Statements, Captions [Line Items]
Other expenses									$ (11,696)	$ (11,946)
Income before income tax benefit and equity in undistributed net income of subsidiaries	$ 712	$ 1,232	$ (128)	$ 343	$ 676	$ 818	$ 386	$ 171	2,159	2,051
Income tax benefit									(491)	(452)
NET INCOME	$ 547	$ 949	$ (96)	$ 268	$ 539	$ 606	$ 319	$ 135	1,668	1,599
Glen Burnie Bancorp
Condensed Income Statements, Captions [Line Items]
Dividends and distributions from subsidiaries									1,265	1,070
Other expenses									(236)	(206)
Income before income tax benefit and equity in undistributed net income of subsidiaries									1,029	864
Income tax benefit									43	32
Change in undistributed equity of subsidiaries									596	703
NET INCOME									$ 1,668	$ 1,599