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Earnings Per Common Share - Additional Information (Detail) - shares		3 Months Ended
	Nov. 22, 2019	Mar. 31, 2020	Mar. 31, 2019
Schedule Of Antidilutive Securities Included In Computation Of Earnings Per Share [Line Items]
Shares contingently issuable under shareholder return plan			44,688
Old Line Bancshares, Inc. [Member]
Schedule Of Antidilutive Securities Included In Computation Of Earnings Per Share [Line Items]
Number of shares issued for acquisition	13,351,837
Old Line Bancshares, Inc. [Member] \| Treasury Stock [Member]
Schedule Of Antidilutive Securities Included In Computation Of Earnings Per Share [Line Items]
Shares issued for acquisition, shares	34,998
Stock Option [Member]
Schedule Of Antidilutive Securities Included In Computation Of Earnings Per Share [Line Items]
Securities excluded from computation of net income per diluted shares		510,186	117,600
Restricted Stock [Member]
Schedule Of Antidilutive Securities Included In Computation Of Earnings Per Share [Line Items]
Shares contingently issuable under shareholder return plan		25,618	17,081