Parent Company Financial Information - Condensed Cash Flow Statement (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Cash flows from operating activities:
Net income	$ (152)	$ 411	$ 338	$ 316	$ 395	$ 115	$ 308	$ 283	$ 911	$ 1,101
Adjustments to reconcile net income to net cash provided by operating activities:
Decrease (increase) in other assets									550	(413)
Net cash provided by operating activities									3,253	2,585
Cash flows from financing activities:
Dividends paid									(1,117)	(1,112)
Net cash used in financing activities									25	(2,907)
(Decrease) increase in cash									1,983	(1,749)
Cash and cash equivalents at beginning of year				10,622				12,371	10,622	12,371
Cash and cash equivalents at end of year	12,605				10,622				12,605	10,622
Glen Burnie Bancorp
Cash flows from operating activities:
Net income									911	1,101
Adjustments to reconcile net income to net cash provided by operating activities:
Decrease (increase) in other assets									7	(3)
Increase (decrease) in other liabilities									1	(10)
Decrease (increase) in due from subsidiaries									2	3
Change in undistributed equity of subsidiaries									110	(152)
Net cash provided by operating activities									1,031	939
Cash flows from financing activities:
Proceeds from dividend reinvestment plan									151	157
Dividends paid									(1,117)	(1,111)
Net cash used in financing activities									(966)	(954)
(Decrease) increase in cash									64	(15)
Cash and cash equivalents at beginning of year				$ 169				$ 184	169	184
Cash and cash equivalents at end of year	$ 233				$ 169				$ 233	$ 169