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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
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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

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