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Allowance for Credit Losses - Forecasted Economonic Scenarios (Details)
Mar. 31, 2021
Dec. 31, 2020
Jun. 30, 2020
Measurement of ECL Measurements [Line Items]      
GDP growth rate (percent)     9.00%
Forecast, Quarter ended June 30, 2021 [Member]      
Measurement of ECL Measurements [Line Items]      
Unemployment rate (percent) 6.00% 6.80%  
GDP growth rate (percent) [1] 11.00% 9.20%  
Forecast, Quarter ended December 31, 2021 [Member]      
Measurement of ECL Measurements [Line Items]      
Unemployment rate (percent) 5.50% 6.20%  
GDP growth rate (percent) 4.30% 5.30%  
Forecast, Quarter ended June 30, 2022 [Member]      
Measurement of ECL Measurements [Line Items]      
Unemployment rate (percent) 4.90% 5.90%  
GDP growth rate (percent) 3.70% 3.10%  
Forecast, Quarter ended December 31, 2022 [Member]      
Measurement of ECL Measurements [Line Items]      
Unemployment rate (percent) 4.40% 5.40%  
GDP growth rate (percent) 3.00% 1.80%  
[1] Represents the change in forecasted GDP for the quarter ended June 30, 2021 relative to the GDP for the quarter ended June 30, 2020. The GDP year-over-year growth rate for the quarter ended June 30, 2020 was a decline of 9.0 percent.