Earnings Per Common Share - Additional Information (Detail) - shares				12 Months Ended
	Nov. 22, 2019	Aug. 20, 2018	Apr. 05, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Schedule Of Antidilutive Securities Included In Computation Of Earnings Per Share [Line Items]
Shares contingently issuable under shareholder return plan						42,864
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
Farmers Capital Bank Corporation [Member]
Schedule Of Antidilutive Securities Included In Computation Of Earnings Per Share [Line Items]
Shares issued for acquisition, shares		18,685
Number of shares issued for acquisition		7,920,387
Number of shares options, forfeited prior to vesting.				4,922
Farmers Capital Bank Corporation [Member] | Treasury Stock [Member]
Schedule Of Antidilutive Securities Included In Computation Of Earnings Per Share [Line Items]
Shares issued for acquisition, shares		6,690
First Sentry Bancshares, Inc. [Member]
Schedule Of Antidilutive Securities Included In Computation Of Earnings Per Share [Line Items]
Shares issued for acquisition, shares			9,465
Number of shares issued for acquisition			2,498,761
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				497,540	364,391	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				0	25,616	17,081