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Mergers and Acquisitions - Allocation of Purchase Price of Assets Acquired and Liabilities Assumed (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2020
Nov. 22, 2019
Liabilities assumed    
Goodwill recognized $ 1,100,000  
Old Line [Member]    
Business Acquisition [Line Items]    
Cash and due from banks   $ 60,041
Securities   182,171
Loans   2,514,061
Intangible assets   32,899
Goodwill and other intangible assets   264,713
Accrued income and other assets   195,131
Total assets acquired   3,216,117
Liabilities assumed    
Deposits   2,375,574
Borrowings   286,047
Accrued expenses and other liabilities   60,544
Total liabilities assumed   2,722,165
Fair value of net assets acquired   262,138
Net assets acquired   $ 493,952
Old Line [Member] | Purchase Price Allocation Adjustment [Member]    
Business Acquisition [Line Items]    
Goodwill 203,774  
Securities (349)  
Loans (31,532)  
Intangible assets (692)  
Deferred tax assets 8,166  
Premises and equipment (3,067)  
Accrued income and other assets (1,314)  
Liabilities assumed    
Borrowings 1,283  
Accrued expenses and other liabilities (535)  
Fair value of net assets acquired (28,040)  
Increase in goodwill recognized 28,040  
Goodwill recognized $ 231,814