Derivative Financial Instruments - Derivatives Not Designated as Hedges (Details) - Visa Derivative - Other noninterest income - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Impact on pretax earnings of derivatives not designated as hedges
Net Gains (Losses) on Derivatives			$ (46)	$ 131
Derivatives Not Designated as Hedging Instruments
Impact on pretax earnings of derivatives not designated as hedges
Net Gains (Losses) on Derivatives	$ (49)	$ 22