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Fair Values of Assets and Liabilities - Additional Information (Detail) - USD ($)
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Random sample percentage of securities for each quarter 100.00%    
Total gains or losses included in earnings   $ 0  
Interest rate swaps transferred into Level 3 from Level 2 $ 69,000 0  
Corporate securities transferred from Level 3 to Level 2 0 0  
Impaired loans considered to be credit risk of non-collection 250,000    
Updated appraisal requirement floor 250,000    
Other real estate owned 422,000 534,000  
Financial instrument of credit risk 100,000 100,000  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings On Assets Held At Year End 0    
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset Transfers Between Levels 1 And 2 0 0  
Provision for credit losses 17,759,000 17,521,000 $ (377,000)
Other Assets [Member]      
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Total gains or losses included in earnings 0 0  
Interest rate swaps transferred into Level 3 from Level 2 57,000    
Corporate securities transferred from Level 3 to Level 2 $ 0 $ 0