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Summary of Significant Accounting Policies - Additional Information (Detail)
 12 Months Ended
Apr. 10, 2023
Dec. 31, 2024
USD ($)
Bank
Dec. 31, 2023
USD ($)
Sep. 30, 2024
USD ($)
Jan. 01, 2023
USD ($)
Dec. 31, 2022
USD ($)
Summary Of Significant Accounting Policies [Line Items]            
Period for federal funds sold outstanding   1 day        
Accrued interest receivable   $ 10,700,000 $ 10,200,000      
Delinquent loan is well secured and process of collection   90 days        
Mortgage loans charged off days past due   180 days        
Consumer and credit card loans to accrue interest charged off   120 days        
Unrecognized interest income until loan balance reduced   $ 0        
Amount of fair value of capital over carrying value       $ 16,200,000    
Percentage of fair value of capital over carrying value       4.50%    
Number of times fair value of capital in excess of carrying value of goodwill description   0.2 times        
Foreclosed real estate   $ 0 0      
Percentage of likelihood of realization of recognized tax benefit, minimum   50.00%        
Number of peer group banks | Bank   316        
Reserve portion of allowance of credit loss   $ 52,000 386,000      
Current expected credit losses   25,826,000 $ 25,024,000     $ 20,313,000
Impairment recognized   $ 0        
Captives provision existence period 10 years          
Commercial and Agricultural [member]            
Summary Of Significant Accounting Policies [Line Items]            
Percentage of annual external and independent loan   35.00%        
Cumulative Effect, Period of Adoption, Adjustment [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Current expected credit losses           $ 3,564,000
ASU 2016-13 [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Change in accounting principle, accounting standards update, adopted [true false]   true        
Change in accounting principle, accounting standards update, adoption date   Jan. 01, 2023        
Change in accounting principle, accounting standards update, immaterial effect [true false]   true        
Current expected credit losses   $ 3,600,000     $ 26,043,000  
ASU 2016-13 [Member] | Letter of credit            
Summary Of Significant Accounting Policies [Line Items]            
Current expected credit losses   3,400,000        
ASU 2016-13 [Member] | Unfunded loan commitment            
Summary Of Significant Accounting Policies [Line Items]            
Current expected credit losses   900,000        
ASU 2016-13 [Member] | Other Assets [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Tax impact portion of deferred tax asset   $ 1,100,000        
ASU 2023-02 [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Change in accounting principle, accounting standards update, adopted [true false]   true        
Change in accounting principle, accounting standards update, adoption date   Jan. 01, 2024        
Maximum [Member]            
Summary Of Significant Accounting Policies [Line Items]            
Maturity period of cash equivalents   3 months        
Asset value of peer group banks   $ 5,000,000,000        
Percentage of captive claims listed transaction loss ratio 65.00%          
Percentage of captive claims transaction of interest loss ratio 70.00%