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Basis of Accounting and Consolidation - Additional Information (Details) - USD ($)
 12 Months Ended
Mar. 20, 2023
Feb. 14, 2022
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Summary Of Significant Accounting Policies [Line Items]            
Common stock, par value (in dollars per share)     $ 4 $ 4    
Assets     $ 7,586,794,000 $ 6,744,215,000    
Loans     5,506,910,000 4,766,781,000    
Deposits     $ 6,123,659,000 5,257,001,000    
Federal funds selling period     1 day      
Intangible assets amortization period     15 years      
Captive maximum gross premiums     $ 2,650,000      
Value of trust accounts     $ 6,100,000,000 $ 5,300,000,000    
Stock plans, term     10 years      
Maximum number of shares to be issued in stock incentive plan (in shares)     149,983      
RSA/RSU, grants in period, gross     45,986 63,150 48,575  
Employee discount for employee stock purchase plan     15.00%      
Employee stock purchase plan, number of shares authorized     600,000      
Stock issued during period, shares, employee stock purchase plans     38,989 23,055 11,748  
Right of use lease assets     $ 14,306,000 $ 15,774,000    
Lease liability     14,615,000 16,035,000    
Cumulative change in accounting principal     793,204,000 633,155,000 $ 633,894,000 $ 568,228,000
Allowance for credit losses on loans     $ 68,675,000 $ 59,093,000 $ 54,655,000 $ 41,910,000
Employee Stock Purchase Plan            
Summary Of Significant Accounting Policies [Line Items]            
Shares available for issuance     506,272      
Minimum            
Summary Of Significant Accounting Policies [Line Items]            
Certificates of deposit investments original maturities period     3 years      
Maximum            
Summary Of Significant Accounting Policies [Line Items]            
Certificates of deposit investments original maturities period     5 years      
Delta Bancshare Company            
Summary Of Significant Accounting Policies [Line Items]            
Percentage of issued and outstanding shares acquired   100.00%        
Common stock, par value (in dollars per share)   $ 10.00        
Share Price   $ 4.00        
Consideration payable in cash   $ 15,150,000        
Consideration payable in shares   2,292,270        
Blackhawk Bancorp, Inc            
Summary Of Significant Accounting Policies [Line Items]            
Percentage of issued and outstanding shares acquired 100.00%          
Common stock, par value (in dollars per share) $ 0.01          
Share Price $ 4          
Consideration payable in cash $ 1,928          
Consideration payable in shares 3,290,222          
Conversion of common stock 1.15          
Common stock consideration value $ 93,508,000