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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 6 Months Ended
Apr. 30, 2021
Apr. 30, 2021
Mar. 31, 2021
Jan. 31, 2021
Jun. 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%