Parent Company Financial Information - Condensed Cash Flow Statement (Details) - USD ($) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2018	Dec. 31, 2017
Cash flows from operating activities:
Net income	$ 307	$ 542	$ 478	$ 255	$ (152)	$ 411	$ 338	$ 316	$ 1,583	$ 911
Adjustments to reconcile net income to net cash provided by operating activities:
Decrease (increase) in other assets									(538)	1,365
Net cash provided by operating activities									4,136	3,672
Cash flows from financing activities:
Dividends paid									(1,122)	(1,117)
Net cash used in financing activities									22,241	25
Net increase in cash and cash equivalents									3,349	1,983
Glen Burnie Bancorp
Cash flows from operating activities:
Net income									1,583	911
Adjustments to reconcile net income to net cash provided by operating activities:
Decrease (increase) in other assets									2	7
(Decrease) increase in other liabilities									(1)	1
Decrease in due from subsidiaries									1	2
Change in undistributed equity of subsidiaries									(708)	110
Net cash provided by operating activities									877	1,031
Cash flows from financing activities:
Proceeds from dividend reinvestment plan									147	151
Dividends paid									(1,122)	(1,117)
Net cash used in financing activities									(975)	(966)
Net increase in cash and cash equivalents									(98)	64
Cash and cash equivalents at beginning of year				$ 233					233	169
Cash and cash equivalents at end of year	$ 135				$ 169				$ 135	$ 233