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Borrowings - Additional Information (Detail) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Debt Instrument [Line Items]          
Federal home loan bank advance $ 150,000,000   $ 150,000,000   $ 311,700,000 [1]
Federal home loan bank stock 9,400,000   9,400,000   14,700,000
Subordinated notes, net 39,871,000   39,871,000   39,920,000 [1]
Subordinated Notes [Member]          
Debt Instrument [Line Items]          
Subordinated notes, net $ 39,900,000   $ 39,900,000   39,900,000
Subordinated Notes [Member] | 2030 Note [Member]          
Debt Instrument [Line Items]          
Subordinated debt instrument maturity date     Jun. 01, 2030    
Effective interest rate 6.10% 6.10% 6.10% 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 25,100,000   $ 25,100,000    
Debt instrument, unamortized premium $ 603,000   $ 603,000    
Effective interest rate 5.30% 5.30% 5.10% 5.10%  
Unsecured Lines of Credit [Member]          
Debt Instrument [Line Items]          
Maximum overnight line of credit facilities available $ 25,000,000   $ 25,000,000   28,000,000
Overnight line of credit facilities outstanding 0   0   0
Federal Reserve Board Bank Term Funding Program [Member]          
Debt Instrument [Line Items]          
Outstanding borrowings $ 0   $ 0   0
Maturity date of FRB borrowings     May 10, 2024    
Debt Instrument, Interest Rate, Stated Percentage 4.74%   4.74%    
Borrowings avalible through BTFP $ 267,000,000   $ 267,000,000    
Borrowings available through discount window 277,600,000   277,600,000    
FRB Borrowings one advance $ 65,000,000   $ 65,000,000    
Debt instrument interest rate stated percentage 4.74%   4.74%    
FHLB [Member]          
Debt Instrument [Line Items]          
Federal home loan bank advances, maximum borrowing capacity percentage on assets     30.00%    
Line of credit $ 532,700,000   $ 532,700,000   525,100,000
Federal home loan bank advance 150,000,000   150,000,000   311,700,000
FHLB [Member] | Restricted Equity Investments [Member]          
Debt Instrument [Line Items]          
Federal home loan bank stock 9,400,000   9,400,000   $ 14,700,000
FHLB [Member] | Line of Credit [Member]          
Debt Instrument [Line Items]          
Federal home loan bank advance 282,700,000   282,700,000    
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 $ 100,000,000   $ 100,000,000    
[1] Derived from audited December 31, 2022 Consolidated Financial Statements.