Annual report pursuant to Section 13 and 15(d)

Summary of Significant Accounting Policies - Additional Information (Detail)

v3.22.4
Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Jan. 01, 2020
USD ($)
Dec. 31, 2022
USD ($)
Branch
Segment
shares
Dec. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Jan. 24, 2019
shares
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Number of reportable segments | Segment   1      
Accrued interest receivable on available-for-sale debt securities   $ 2,400,000 $ 1,900,000    
Debt Securities, Available-for-Sale, Accrued Interest, after Allowance for Credit Loss, Statement of Financial Position [Extensible Enumeration]   Accrued interest Accrued interest    
Increase to beginning balance of allowance for credit losses $ 17,400,000        
Decrease to beginning balance of allowance for off balance sheet items 335,000        
Retained earnings   $ 269,542,000 $ 196,784,000    
Impairment of intangible assets   0      
Goodwill impairment loss   0      
Bank-owned life insurance   $ 55,544,000 54,905,000    
Stock options, expiration term from date of grant   10 years      
Number of shares authorized for repurchase (percent)         5.00%
Number of shares authorized for repurchase under program (shares) | shares         1,500,000
Shares repurchased (shares) | shares   0      
Shares repurchased     $ 6,135,000 $ 2,196,000  
Minimum          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Period of continuous service   3 years      
Maximum          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Period of continuous service   5 years      
Split Dollar Death Benefit Agreement          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Bank-owned life insurance   $ 3,000,000.0      
Cumulative Effect Period of Adoption Adjustment | Impact of ASU 2016-13 Adoption          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Retained earnings $ 12,200,000        
Full Service          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Number of branches | Branch   35      
Loan Production          
Financing Receivable, Recorded Investment, Past Due [Line Items]          
Number of branches | Branch   8