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Allowance for Credit Losses - Narrative (Details)
$ in Millions
3 Months Ended
Mar. 31, 2022
USD ($)
scenario
Mar. 31, 2021
USD ($)
Dec. 31, 2021
scenario
Measurement of ECL Measurements [Line Items]      
Number of forward-looking economic scenarios     3
Number of updated forward-looking economic scenarios 5    
Commercial loans held for sale      
Measurement of ECL Measurements [Line Items]      
Charge-off of accrued interest receivables | $ $ 0 $ 0  
Minimum      
Measurement of ECL Measurements [Line Items]      
Number of forward-looking economic scenarios 4