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