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Business Combinations - Additional Information (Details) - USD ($)
 3 Months Ended 12 Months Ended
Mar. 20, 2023
Sep. 30, 2023
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Business Acquisition [Line Items]          
Common stock, par value (in dollars per share)     $ 4 $ 4  
Intangible asset estimated useful life     15 years    
Blackhawk Bancorp, Inc          
Business Acquisition [Line Items]          
Conversion of Stock, Shares Issued 1.15        
Percentage of issued and outstanding shares acquired 100.00%        
Common stock, par value (in dollars per share) $ 0.01        
Share Price $ 4        
Consideration paid in cash $ 2,000        
Purchase price $ 93,510,000        
Consideration paid in shares 3,290,222        
Goodwill acquired during period $ 50,100,000 $ 50,100,000      
Pre-tax of acquisition costs     $ 2,500,000 $ 8,200,000 $ 0
Allowance for credit losses for loans identified as PCD 3,791,000        
Purchased credit deteriorated loans 105,983,000        
Blackhawk Bancorp, Inc | ASU 2016-13          
Business Acquisition [Line Items]          
Allowance for credit losses 3,800,000        
Allowance for credit losses on non-PCD loans $ 618,330,000        
Blackhawk Bancorp, Inc | Core Deposit Intangibles          
Business Acquisition [Line Items]          
Intangible asset estimated useful life 10 years        
Blackhawk Bancorp, Inc | Fair Value Adjustments          
Business Acquisition [Line Items]          
Purchase price $ 93,510,000        
Loans, net 722,866,000        
Change in acquired time deposits $ 1,194,972,000