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Business Combinations - Unaudited Pro Forma Condensed Combined Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Blackhawk Bancorp, Inc      
Business Acquisition [Line Items]      
Net interest income $ 229,317 $ 239,748  
Provision for credit losses 7,320 3,856  
Non-interest income 95,660 89,575  
Non-interest expense 223,354 219,646  
Income before income taxes 94,303 105,821  
Income tax expense 20,744 21,297  
Net income available to common stockholders $ 73,559 $ 84,524  
Earnings per share      
Basic $ 3.38 $ 3.6  
Diluted $ 3.36 $ 3.59  
Basic weighted average shares outstanding 21,780,217 24,459,299  
Diluted weighted average shares outstanding 21,868,788 23,533,857  
Delta Bancshare Company      
Business Acquisition [Line Items]      
Net interest income   $ 187,075 $ 147,387
Provision for credit losses   4,806 14,679
Non-interest income   74,799 53,371
Non-interest expense   165,062 132,086
Income before income taxes   92,006 53,993
Income tax expense   18,508 12,321
Net income available to common stockholders   $ 73,498 $ 41,672
Earnings per share      
Basic   $ 3.64 $ 2.07
Diluted   $ 3.63 $ 2.07
Basic weighted average shares outstanding   20,169,077 20,111,889
Diluted weighted average shares outstanding   20,243,635 20,164,909