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Acquisitions - Summary of Pro Forma Financial Information (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Business Acquisition [Line Items]    
Business Acquisition, Pro Forma Earnings Per Share, Basic $ 0.70 $ (0.72)
Business Acquisition, Pro Forma Earnings Per Share, Diluted $ 0.70 $ (0.72)
Great Western Bank    
Business Acquisition [Line Items]    
Total revenues $ 268.9 $ 321.6
Net income (loss) $ 76.4 $ (78.2)