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Business Combinations - Unaudited Pro Forma Condensed Combined Financial Information (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Business Acquisition [Line Items]        
Net interest income       $ 141,524
Provision for loan losses       4,001
Non-interest income       56,592
Non-interest expense       125,690
Income before taxes       68,425
Income tax expense       15,480
Net income       $ 52,945
Earnings per share        
Basic       $ 2.64
Diluted       $ 2.63
Basic weighted average shares o/s       20,070,687
Diluted weighted average shares o/s       20,145,435
Blackhawk Bancorp, Inc        
Business Acquisition [Line Items]        
Net interest income $ 57,245 $ 52,141 $ 171,635 $ 179,040
Provision for loan losses 6,246 1,742 6,768 2,601
Non-interest income 25,205 16,712 73,892 67,954
Non-interest expense 60,741 44,476 166,430 162,943
Income before taxes 15,463 22,635 72,329 81,450
Income tax expense 3,830 5,191 17,069 18,662
Net income $ 11,633 $ 17,444 $ 55,260 $ 62,788
Earnings per share        
Basic $ 0.52 $ 0.73 $ 2.62 $ 2.69
Diluted $ 0.52 $ 0.73 $ 2.61 $ 2.68
Basic weighted average shares o/s 22,220,438 23,744,891 21,086,802 23,360,909
Diluted weighted average shares o/s 22,319,334 23,825,437 21,176,946 23,435,657