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Borrowings - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Jun. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Debt Instrument [Line Items]            
Federal home loan bank advance $ 190,000,000     $ 190,000,000   $ 210,000,000 [1]
Federal home loan bank stock 11,300,000     11,300,000   12,300,000
Subordinated notes, net 39,806,000     39,806,000   39,855,000 [1]
Subordinated Notes [Member]            
Debt Instrument [Line Items]            
Subordinated notes, net $ 39,800,000     $ 39,800,000   39,900,000
Subordinated Notes [Member] | 2030 Note [Member]            
Debt Instrument [Line Items]            
Subordinated debt instrument maturity date       Jun. 01, 2030    
Effective interest rate 6.08%   6.10% 6.08% 6.10%  
Unamortized debt issuance cost $ 14,800,000     $ 14,800,000    
Subordinated Notes [Member] | 2029 Notes [Member]            
Debt Instrument [Line Items]            
Subordinated debt instrument maturity date       Oct. 15, 2029    
Debt instrument carrying amount 25,000,000     $ 25,000,000    
Debt instrument, unamortized premium $ 503,000     $ 503,000    
Effective interest rate 5.30%   5.30% 5.20% 5.10%  
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]            
Line of Credit Facility, Remaining Borrowing Capacity 69,600,000     69,600,000   161,000,000
Advance from federal reserve bank 0     $ 0   0
Repayment of FRB borrowings   $ 65,000,000        
FHLB [Member]            
Debt Instrument [Line Items]            
Federal home loan bank advances, maximum borrowing capacity percentage on assets       30.00%    
Line of creidt 680,100,000     $ 680,100,000   455,600,000
Federal home loan bank advance 190,000,000     190,000,000   210,000,000
FHLB [Member] | Public Deposits with Treasury Board of Virginia [Member]            
Debt Instrument [Line Items]            
Line of creidt 81,200,000     81,200,000   110,100,000
FHLB [Member] | Restricted Equity Investments [Member]            
Debt Instrument [Line Items]            
Federal home loan bank stock 11,300,000     11,300,000   12,300,000
FHLB [Member] | Line of Credit [Member]            
Debt Instrument [Line Items]            
Federal home loan bank advance 408,900,000     408,900,000   135,500,000
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 $ 80,000,000     $ 80,000,000   $ 110,000,000
[1] Derived from audited December 31, 2023 Consolidated Financial Statements.