Derivative Financial Instruments - Derivatives Not Designated as Hedges (Details) - Other noninterest income - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Visa Derivative
Impact on pretax earnings of derivatives not designated as hedges
Net Gains (Losses) on Derivatives			$ 3	$ 109
Visa Derivative | Derivatives Not Designated as Hedging Instruments
Impact on pretax earnings of derivatives not designated as hedges
Net Gains (Losses) on Derivatives	$ (23)	$ 103
Foreign exchange contracts | Derivatives Not Designated as Hedging Instruments
Impact on pretax earnings of derivatives not designated as hedges
Net Gains (Losses) on Derivatives		$ 52