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Business Combinations - Additional Information (Detail) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended
Jan. 31, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Business Acquisition [Line Items]            
Common stock, shares, issued   18,776,307   18,776,307   8,577,932
Options to acquire shares of common stock on post stock split basis 148,764          
Settlement of net debt         $ 349,000  
Goodwill   $ 26,826,000   $ 26,826,000   $ 19,620,000 [1]
Fair value adjustments of subordinated notes       $ 0    
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          
Merger-related expense   $ 1,400,000 $ 1,300,000 $ 11,700,000 $ 1,700,000  
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.