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Acquisitions - Schedule of Acquired loans with Credit Impairment (Details)
$ in Millions
Feb. 01, 2022
USD ($)
Business Acquisition [Line Items]  
Purchase price (initial fair value) $ 623.3
Allowance for credit losses 298.2
Great Western Bank  
Business Acquisition [Line Items]  
Unpaid principal balance 979.2
Credit discount 69.2
Discount attributable to other factors 29.9
Purchase price (initial fair value) 623.3
Allowance for credit losses 59.5
Amortized cost basis $ 682.8