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Business Combinations - Summary of Estimated Fair Value Adjustments of Consideration Paid, Acquired Asset and Assumed Liabilities (Parenthetical) (Detail) - USD ($)
1 Months Ended 9 Months Ended
Apr. 30, 2021
Mar. 31, 2021
Jan. 31, 2021
Sep. 30, 2021
Business Acquisition [Line Items]        
Stock split description 3-for-2 stock split In March 2021, the Company’s board of directors approved a three-for-two stock split (“Stock Split”) effected in the form of a 50% stock dividend on the Company’s common stock outstanding paid on April 30, 2021 to shareholders of record as of April 20, 2021.    
Statutory federal tax rate       21.00%
Bay Banks [Member]        
Business Acquisition [Line Items]        
Stock split description     Common shares issued and purchase price per share are presented on a post Stock Split basis  
Statutory federal tax rate     21.00%  
FHLB advance assumed     $ 10,124,000  
Bay Banks [Member] | Time Deposits [Member]        
Business Acquisition [Line Items]        
Fair value adjustment (premium)     5,800,000  
Bay Banks [Member] | FHLB [Member]        
Business Acquisition [Line Items]        
Fair value adjustment (premium)     124,000  
Bay Banks [Member] | Subordinated Notes [Member]        
Business Acquisition [Line Items]        
Fair value adjustment (premium)     950,000  
Bay Banks [Member] | Core Deposits [Member]        
Business Acquisition [Line Items]        
Fair value adjustment (premium)     100,000  
Bay Banks [Member] | Premises and Equipment [Member]        
Business Acquisition [Line Items]        
Fair value adjustment (premium)     4,400,000  
Bay Banks [Member] | Deferred Tax Asset, Net [Member]        
Business Acquisition [Line Items]        
Fair value adjustment (premium)     2,100,000  
Bay Banks [Member] | Core Deposits Intangible [Member]        
Business Acquisition [Line Items]        
Fair value adjustment (premium)     203,000  
Bay Banks [Member] | Loan Held for Investment [Member]        
Business Acquisition [Line Items]        
Fair value adjustment (premium)     $ 17,900,000  
Fair value adjustment percentage     1.70%