Allowance for Credit Losses - Forecasted Economic Scenarios (Details)	Sep. 30, 2025	Jun. 30, 2025	Dec. 31, 2024
Forecast, Quarter ended December 31, 2025
Measurement of ECL Measurements [Line Items]
Unemployment rate (quarterly average) (in percent)	4.50%	4.60%	4.40%
GDP growth rate (year-over-year) (in percent)	1.10%	1.10%	1.80%
Forecast, Quarter ended June 30, 2026
Measurement of ECL Measurements [Line Items]
Unemployment rate (quarterly average) (in percent)	4.60%	4.60%	4.30%
GDP growth rate (year-over-year) (in percent)	1.30%	1.60%	1.60%
Forecast, Quarter ended December 31, 2026
Measurement of ECL Measurements [Line Items]
Unemployment rate (quarterly average) (in percent)	4.40%	4.50%	4.30%
GDP growth rate (year-over-year) (in percent)	1.80%	1.60%	1.60%