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Borrowings - Additional Information (Detail) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Jun. 30, 2020
Dec. 31, 2021
Debt Instrument [Line Items]        
FHLB borrowings $ 10,108     $ 10,111 [1]
Federal home loan bank stock 1,800     1,700
Subordinated notes, net outstanding 39,970     39,986 [1]
Subordinated Notes [Member]        
Debt Instrument [Line Items]        
Subordinated notes, net outstanding $ 40,000     40,000
Subordinated Notes [Member] | 2029 Notes [Member]        
Debt Instrument [Line Items]        
Subordinated debt instrument maturity date Oct. 15, 2029      
Debt instrument carrying amount $ 25,300      
Debt instrument, unamortized premium $ 830      
Effective interest rate 5.10% 4.70%    
Subordinated Notes [Member] | 2030 Note [Member]        
Debt Instrument [Line Items]        
Subordinated debt instrument maturity date Jun. 01, 2030      
Effective interest rate 6.10%      
Unamortized debt issuance cost $ 14,700      
Unsecured Lines of Credit [Member]        
Debt Instrument [Line Items]        
Maximum overnight line of credit facilities available 44,000     44,000
Overnight line of credit facilities outstanding 0     0
Federal Reserve Paycheck Protection Program Liquidity [Member]        
Debt Instrument [Line Items]        
Percentage of advances on PPP loan value and term     100.00%  
Fixed annual cost basis points     35.00%  
Total advances $ 15,200      
Minimum [Member] | Federal Reserve Paycheck Protection Program Liquidity [Member]        
Debt Instrument [Line Items]        
Borrowing maturity 1 year      
Maximum [Member] | Federal Reserve Paycheck Protection Program Liquidity [Member]        
Debt Instrument [Line Items]        
Borrowing maturity 3 years      
FHLB [Member]        
Debt Instrument [Line Items]        
Loans outstanding $ 315,100     358,100
Federal home loan bank advances, maximum borrowing capacity percentage on assets 30.00%      
Federal home loan bank, advances, interest Rate 0.56%      
FHLB borrowings $ 10,000     10,000
Subordinated debt instrument maturity date Feb. 28, 2030      
FHLB [Member] | Restricted Equity Investments [Member]        
Debt Instrument [Line Items]        
Federal home loan bank stock $ 1,800     $ 1,700
FHLB [Member] | Line of Credit [Member]        
Debt Instrument [Line Items]        
FHLB borrowings 220,100      
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 $ 85,000      
[1] Derived from audited December 31, 2021 Consolidated Financial Statements.