Parent Company Financial Information - Condensed Cash Flow Statement (Details) - USD ($)	3 Months Ended								12 Months Ended
	Dec. 31, 2021	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020	Sep. 30, 2020	Jun. 30, 2020	Mar. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Cash flows from operating activities:
Net income	$ 555,000	$ 888,000	$ 479,000	$ 594,000	$ 547,000	$ 949,000	$ (96,000)	$ 268,000	$ 2,516,387	$ 1,667,741
Adjustments to reconcile net income to net cash provided by operating activities:
(Increase) decrease in other assets									(18,000)	798,000
Net cash provided by operating activities									3,656,000	1,602,000
Cash flows from financing activities:
Dividends paid									(1,138,000)	(1,134,000)
Net cash used in financing activities									22,707,000	32,089,000
Net increase (decrease) in cash and cash equivalents									25,088,000	23,803,000
Glen Burnie Bancorp
Cash flows from operating activities:
Net income									2,516,000	1,668,000
Adjustments to reconcile net income to net cash provided by operating activities:
(Increase) decrease in other assets									(3,000)
Change in undistributed equity of subsidiary									(1,517,000)	(596,000)
Net cash provided by operating activities									996,000	1,072,000
Cash flows from financing activities:
Proceeds from dividend reinvestment plan									130,000	130,000
Dividends paid									(1,138,000)	(1,134,000)
Net cash used in financing activities									(1,008,000)	(1,004,000)
Net increase (decrease) in cash and cash equivalents									(12,000)	68,000
Cash and cash equivalents at beginning of year				$ 111,000				$ 43,000	111,000	43,000
Cash and cash equivalents at end of year	$ 99,000				$ 111,000				$ 99,000	$ 111,000