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Business Combinations - Additional Information (Details) - USD ($)
 3 Months Ended 9 Months Ended 12 Months Ended
Mar. 20, 2023
Feb. 14, 2022
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2021
Business Acquisition [Line Items]                    
Common stock, par value (in dollars per share)     $ 4   $ 4   $ 4      
Allowance for credit losses     $ 68,241,000 $ 58,777,000 $ 68,241,000 $ 58,777,000 $ 59,093,000 $ 58,719,000 $ 59,075,000 $ 54,655,000
Delta Bancshare Company                    
Business Acquisition [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 paid in cash   $ 15,150,000                
Consideration paid in shares   2,292,270                
Goodwill acquired during period   $ 28,200,000                
Pre-tax of acquisition costs     2,600,000   2,600,000          
Pre-tax of acquisition costs             $ 2,100,000      
Loans   418,509,000                
Accreted to interest income over the remaining term of loans   8,200,000                
Elimination of deferred fees and unearned discounts previously recorded by Jefferson Bank         300,000          
Allowance for credit losses for loans identified as PCD   863,000                
Change in acquired time deposits   560,378,000                
Change in FHLB advances   45,075,000                
Allowance for credit losses   (863,000)                
Delta Bancshare Company | Core Deposit Intangibles                    
Business Acquisition [Line Items]                    
Intangible asset fair value   $ 5,920,000                
Intangible asset estimated useful life   10 years                
Delta Bancshare Company | Fair Value Adjustments                    
Business Acquisition [Line Items]                    
Loans   $ (7,924,000)                
Change in acquired time deposits   1,759,000                
Change in FHLB advances   75,000                
Allowance for credit losses   4,525,000                
Delta Bancshare Company | Fair Value Adjustments | Core Deposit Intangibles                    
Business Acquisition [Line Items]                    
Intangible asset fair value   5,920,000                
Delta Bancshare Company | Acquired Book Value                    
Business Acquisition [Line Items]                    
Loans   426,433,000                
Purchased credit deteriorated loans   18,800,000                
Change in acquired time deposits   558,619,000                
Change in FHLB advances   45,000,000                
Allowance for credit losses   (5,388,000)                
Delta Bancshare Company | Acquired Book Value | Core Deposit Intangibles                    
Business Acquisition [Line Items]                    
Intangible asset fair value   $ 0                
Blackhawk Bancorp, Inc                    
Business Acquisition [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 paid in cash $ 1,928                  
Consideration paid in shares 3,290,222                  
Conversion of common stock 1.15                  
Goodwill acquired during period $ 50,100,000                  
Pre-tax of acquisition costs     $ 2,100,000 $ 0 $ 2,600,000 $ 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]                    
Loans $ 722,866,000                  
Change in acquired time deposits $ 1,194,972,000