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Goodwill and Other Intangible Assets - Additional Information (Detail) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Jan. 31, 2021
Goodwill [Line Items]      
Goodwill $ 26,826 $ 19,620  
Intangible amortization 1,867 825  
Net assets acquired 7,742 2,581  
Accumulated amortization of intangibles 4,543 2,382  
Mortgage servicing asset 16,500 7,100  
Core Deposits [Member]      
Goodwill [Line Items]      
Net assets acquired 6,718 1,410  
Accumulated amortization of intangibles 2,908 1,366  
Loan Servicing Assets Included In Other Amortization Intangibles [Member]      
Goodwill [Line Items]      
Accumulated amortization of intangibles 362 209  
Loan Servicing Assets Included In Interest And Fees On Loans [Member]      
Goodwill [Line Items]      
Intangible amortization $ 266 $ 189  
Bay Banks Of Virginia Inc [Member]      
Goodwill [Line Items]      
Goodwill     $ 7,206
Bay Banks Of Virginia Inc [Member] | Core Deposits [Member]      
Goodwill [Line Items]      
Amortization of intangible assets 10 years    
Net assets acquired $ 6,900