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