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Business Combinations - Additional Information (Detail) - USD ($)
 1 Months Ended 3 Months Ended
Jan. 31, 2021
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Business Acquisition [Line Items]        
Common stock, shares, issued   18,621,531   8,577,932
Options to acquire shares of common stock on post stock split basis 148,764      
Goodwill   $ 27,098,000   $ 19,892,000 [1]
Merger-related expense   $ 9,000,000    
Statutory federal tax rate   21.00%    
Core Deposits [Member]        
Business Acquisition [Line Items]        
Amortized over an estimated useful life   10 years    
Bay Banks [Member]        
Business Acquisition [Line Items]        
Common stock shares received by shareholders 0.5000      
Common stock, shares, issued 6,634,495      
Business acquisition, common stock issued post stock split basis 9,951,743      
Fair value of consideration transferred $ 124,900,000      
Cash paid in lieu of fractional shares to common shareholders $ 3,400      
Option to purchase additional shares 198,362      
Options to acquire shares of common stock 99,176      
Options to acquire shares of common stock on post stock split basis 148,764      
Estimated fair value of common stock $ 472,000      
Settlement of net debt 650,000      
Goodwill $ 7,206,000 $ 7,206,000    
Merger-related expense     $ 0  
Statutory federal tax rate 21.00%      
Bay Banks [Member] | Subordinated Notes [Member]        
Business Acquisition [Line Items]        
Acquired subordinated notes $ 1,750,000      
Bay Banks [Member] | Subordinated Notes [Member]        
Business Acquisition [Line Items]        
Acquired subordinated notes $ 1,100,000      
[1] Derived from audited December 31, 2020 Consolidated Financial Statements.