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Acquisitions - Summary of Pro Forma Financial Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Business Acquisition [Line Items]        
Business Acquisition, Pro Forma Earnings Per Share, Basic $ 0.93 $ 1.33 $ 1.76 $ 0.61
Business Acquisition, Pro Forma Earnings Per Share, Diluted $ 0.93 $ 1.33 $ 1.76 $ 0.61
Great Western Bank        
Business Acquisition [Line Items]        
Total revenues $ 300.7 $ 291.8 $ 569.6 $ 613.4
Net income $ 101.1 $ 144.6 $ 177.5 $ 66.4