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Business Combinations - Unaudited Pro Forma Condensed Combined Financial Information (Details) - Blackhawk Bancorp, Inc - USD ($)
$ / shares in Units, $ in Thousands
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
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