Parent Company Financial Information - Condensed Cash Flow 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
Cash flows from operating activities:
Net income	$ 547	$ 949	$ (96)	$ 268	$ 539	$ 606	$ 319	$ 135	$ 1,668	$ 1,599
Adjustments to reconcile net income to net cash provided by operating activities:
Decrease (increase) in other assets									798	206
Net cash provided by operating activities									1,602	2,992
Cash flows from financing activities:
Dividends paid									(1,134)	(1,128)
Net cash used in financing activities									32,089	(32,004)
Net increase (decrease) in cash and cash equivalents									23,803	(2,664)
Glen Burnie Bancorp
Cash flows from operating activities:
Net income									1,668	1,599
Adjustments to reconcile net income to net cash provided by operating activities:
Decrease (increase) in other assets										2
Change in undistributed equity of subsidiaries									(596)	(703)
Net cash provided by operating activities									1,072	898
Cash flows from financing activities:
Proceeds from dividend reinvestment plan									130	138
Dividends paid									(1,134)	(1,128)
Net cash used in financing activities									(1,004)	(990)
Net increase (decrease) in cash and cash equivalents									68	(92)
Cash and cash equivalents at beginning of year				$ 43				$ 135	43	135
Cash and cash equivalents at end of year	$ 111				$ 43				$ 111	$ 43