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Loans and the Allowance for Credit Losses - Additional Information (Detail)
3 Months Ended 12 Months Ended
Jan. 01, 2020
USD ($)
Nov. 22, 2019
USD ($)
Mar. 31, 2020
USD ($)
Contract
Dec. 31, 2019
USD ($)
Contract
Financing Receivable, Recorded Investment [Line Items]        
Net Deferred loan (costs) and fees     $ 5,000,000.0 $ 4,800,000
Unaccreted discount on purchased loans from acquisitions     52,500,000 51,900,000
Recognition on retained earnings     $ (26,591,000)  
Percentage of national unemployment projection     8.70%  
Expected average percentage of national unemployment in future     6.50%  
Calculation period of reversion     1 year  
Accrued interest receivable for loans     $ 33,500,000  
Aggregate amount of residential real estate, home equity and consumer loans classified as substandard     28,700,000 28,300,000
Internally assigned loan grades to residential real estate, home equity and consumer loans     $ 5,400,000 5,100,000
Loans acquired with deteriorated credit quality       $ 14,513,000
Number of restructured contracts greater than $0 million | Contract     0 0
Threshold for TDR     $ 1,000,000.0 $ 1,000,000.0
Accruing and non accrual TDR permitted interest-only payment period     6 months  
Unfunded commitments to debtors for impaired loans     $ 300,000 3,300,000
Other real estate owned     1,032,000 4,062,000
Residential Real Estate [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans acquired with deteriorated credit quality       4,104,000
Other real estate owned     700,000 600,000
Foreclosure proceedings in process on residential real estate loans     6,600,000 $ 8,100,000
ASU 2016-13 [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Recognition on retained earnings $ 41,400,000   41,442,000  
Adjustment for loan credit losses 6,700,000      
ASU 2016-13 [Member] | Residential Real Estate [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Recognition on retained earnings     5,630,000  
Old Line Bancshares, Inc. [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Unaccreted discount on purchased loans from acquisitions     27,800,000  
Portfolio loans, net of unearned income   $ 2,570,000,000.0    
Loans   2,514,300,000    
Book Value of 310-20 loans   2,543,800,000    
Fair market value adjustment of acquired loans   55,600,000    
Loans acquired with deteriorated credit quality   26,200,000 21,300,000  
Loans acquired with deteriorated credit quality, fair value   19,200,000    
Loans acquired with deteriorated credit quality outstanding customer balance     21,800,000  
Acquired impaired loans allowances for credit loss $ 6,100,000   6,000,000.0  
Acquired loans, sold book value     56,600,000  
Acquired loans, sold     36,700,000  
Acquired loans, held for sale     8,900,000  
Old Line Bancshares, Inc. [Member] | Cost Recovery Method [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans acquired with deteriorated credit quality, fair value   $ 4,000,000.0    
Old Line Bancshares, Inc. [Member] | Nonperforming Loans [Member]        
Financing Receivable, Recorded Investment [Line Items]        
Loans acquired with deteriorated credit quality outstanding customer balance     $ 2,600,000