v3.25.2
Borrowings - Additional Information (Detail) - USD ($)
3 Months Ended 6 Months Ended
Jun. 01, 2025
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 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   24,928,000   24,928,000   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   200,000 $ 200,000 $ 400,000 $ 500,000      
2029 Notes [Member]                
Debt Instrument [Line Items]                
Effective interest rate       8.59%        
Subordinated debt [Member]                
Debt Instrument [Line Items]                
Subordinated notes, net   $ 24,900,000   $ 24,900,000   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   $ 24,900,000   $ 24,900,000        
Debt instrument, unamortized premium   $ 400,000   $ 400,000        
Effective interest rate   7.86% 5.08% 7.96% 5.15%      
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   75,100,000   75,100,000   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   583,300,000   $ 583,300,000        
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   415,300,000   415,300,000        
FHLB [Member] | Securities [Member]                
Debt Instrument [Line Items]                
Assets pledged with federal home loan bank against credit facilities   168,000,000   168,000,000        
FHLB [Member] | Public Deposits with Treasury Board of Virginia [Member]                
Debt Instrument [Line Items]                
Line of credit   51,200,000   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   $ 382,200,000   $ 382,200,000   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           $ 50,000,000    
[1] Derived from audited December 31, 2024 Consolidated Financial Statements.