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Borrowings - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Jul. 15, 2025
Jun. 01, 2025
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Dec. 31, 2024
May 31, 2020
Oct. 31, 2019
Debt Instrument [Line Items]                  
Federal home loan bank advance     $ 150,000,000   $ 150,000,000   $ 150,000,000 [1]    
Federal home loan bank stock     9,100,000   9,100,000   9,400,000    
Subordinated notes, net     14,731,000   14,731,000   39,789,000 [1]    
2030 Notes [Member]                  
Debt Instrument [Line Items]                  
Redemption of Notes   $ 15,000,000              
Debt Instrument, Redemption Period, End Date   Jun. 01, 2025              
Effective interest rate   6.00%              
Interest Expense, Debt     0 $ 200,000 $ 400,000 $ 700,000      
2029 Notes [Member]                  
Debt Instrument [Line Items]                  
Effective interest rate         8.65%        
Partial redemption end date Jul. 15, 2025                
Partial redemption of notes $ 10,000,000                
Subordinated debt [Member]                  
Debt Instrument [Line Items]                  
Subordinated notes, net     $ 14,700,000   $ 14,700,000   39,800,000    
Subordinated debt [Member] | 2030 Notes [Member]                  
Debt Instrument [Line Items]                  
Subordinated debt instrument maturity date         Jun. 01, 2030        
Subordinated notes, net               $ 15,000,000  
Subordinated debt [Member] | 2029 Bay Banks Notes [Member]                  
Debt Instrument [Line Items]                  
Stated Interest Rate     5.625%   5.625%        
Debt instrument, frequency of periodic payment         semi-annually        
Subordinated debt instrument variable interest rate spread         4.335%        
Debt Instrument, Variable Interest Rate, Type [Extensible Enumeration]         Secured Overnight Financing Rate [Member]        
Subordinated debt [Member] | 2029 Notes [Member]                  
Debt Instrument [Line Items]                  
Subordinated debt instrument maturity date         Oct. 15, 2029        
Subordinated notes, net                 $ 25,000,000
Debt instrument carrying amount     $ 14,700,000   $ 14,700,000        
Debt instrument, unamortized premium     $ 300,000   $ 300,000        
Effective interest rate     7.49% 5.30% 7.84% 5.21%      
Unsecured Lines of Credit [Member]                  
Debt Instrument [Line Items]                  
Maximum overnight line of credit facilities available     $ 10,000,000   $ 10,000,000   10,000,000    
Federal Reserve Board Bank Term Funding Program [Member]                  
Debt Instrument [Line Items]                  
Borrowings available through discount window     75,400,000   75,400,000   105,700,000    
Advance from federal reserve bank     0   $ 0   0    
FHLB [Member]                  
Debt Instrument [Line Items]                  
Federal home loan bank advances, maximum borrowing capacity percentage on assets         30.00%        
Secured facility totaled     620,900,000   $ 620,900,000        
Line of credit             696,000,000    
Federal home loan bank advance     150,000,000   150,000,000   150,000,000    
Assets pledged with federal home loan bank against credit facilities     453,200,000   453,200,000        
FHLB [Member] | Securities [Member]                  
Debt Instrument [Line Items]                  
Assets pledged with federal home loan bank against credit facilities     167,700,000   167,700,000        
FHLB [Member] | Public Deposits with Treasury Board of Virginia [Member]                  
Debt Instrument [Line Items]                  
Line of credit     41,200,000   41,200,000   51,200,000    
FHLB [Member] | Restricted Equity Investments [Member]                  
Debt Instrument [Line Items]                  
Federal home loan bank stock     9,100,000   9,100,000   9,400,000    
FHLB [Member] | Line of Credit [Member]                  
Debt Instrument [Line Items]                  
Federal home loan bank advance     429,700,000   429,700,000   494,900,000    
FHLB [Member] | Line of Credit [Member] | Public Deposits with Treasury Board of Virginia [Member]                  
Debt Instrument [Line Items]                  
Assets pledged with federal home loan bank against credit facilities     $ 40,000,000   $ 40,000,000   $ 50,000,000    
[1] Derived from audited December 31, 2024 Consolidated Financial Statements.