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Borrowings - Additional Information (Detail) - USD ($)
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Debt Instrument [Line Items]      
Federal home loan bank advance $ 280,000,000   $ 210,000,000 [1]
Federal home loan bank stock 15,600,000   12,300,000
Subordinated notes, net 39,838,000   39,855,000 [1]
Subordinated Notes [Member]      
Debt Instrument [Line Items]      
Subordinated notes, net $ 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 6.09% 6.10%  
Unamortized debt issuance cost $ 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 $ 25,100,000    
Debt instrument, unamortized premium $ 553,000    
Effective interest rate 5.22% 5.09%  
Unsecured Lines of Credit [Member]      
Debt Instrument [Line Items]      
Maximum overnight line of credit facilities available $ 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 101,800,000   161,000,000
Advance from federal reserve bank 0   0
Borrowings avalible through BTFP 69,000,000    
FRB Borrowings one advance $ 65,000,000    
Maturity date of FRB borrowings May 10, 2024    
Debt instrument interest rate stated percentage 4.74%    
FHLB [Member]      
Debt Instrument [Line Items]      
Federal home loan bank advances, maximum borrowing capacity percentage on assets 30.00%    
Line of creidt $ 656,500,000   455,600,000
Federal home loan bank advance 280,000,000   210,000,000
FHLB [Member] | Public Deposits with Treasury Board of Virginia [Member]      
Debt Instrument [Line Items]      
Line of creidt 111,200,000   110,100,000
FHLB [Member] | Restricted Equity Investments [Member]      
Debt Instrument [Line Items]      
Federal home loan bank stock 15,600,000 $ 12,300,000  
FHLB [Member] | Line of Credit [Member]      
Debt Instrument [Line Items]      
Federal home loan bank advance 265,400,000   $ 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 $ 110,000,000    
[1] Derived from audited December 31, 2023 Consolidated Financial Statements.