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Basis of Accounting and Consolidation - Additional Information (Details) - USD ($)
 3 Months Ended 6 Months Ended
Mar. 20, 2023
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Dec. 31, 2023
Summary Of Significant Accounting Policies [Line Items]            
Common stock, par value (in dollars per share)   $ 4   $ 4   $ 4
Stock plans, term       10 years    
Maximum number of shares to be issued in stock incentive plan (in shares)   399,983   399,983    
Employee discount for employee stock purchase plan       15.00%    
Employee stock purchase plan, number of shares authorized   600,000   600,000    
Stock issued during period, shares, employee stock purchase plans   7,323 9,175 15,935 17,138  
Captive maximum gross premiums       $ 2,800,000    
Employee Stock Option            
Summary Of Significant Accounting Policies [Line Items]            
Common stock awarded in SI plan (in shares)       0    
Restricted Stock            
Summary Of Significant Accounting Policies [Line Items]            
Common stock awarded in SI plan (in shares)       53,766 59,950  
Restricted Stock Units (RSUs)            
Summary Of Significant Accounting Policies [Line Items]            
Common stock awarded in SI plan (in shares)       39,150 37,900  
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          
Conversion of common stock 1.15          
Share Price $ 4          
Consideration payable in cash $ 1,928          
Consideration payable in shares 3,290,222          
Common stock consideration value $ 93,508,000