Fair Value Measurement (Losses Resulting From Nonrecurring Fair Value Adjustments) (Details) - Fair Value, Nonrecurring - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Losses resulting from nonrecurring fair value adjustments	$ 8,470	$ 14,797	$ 43,480	$ 1,838,272
Loans and leases
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Losses resulting from nonrecurring fair value adjustments	8,470	14,797	43,480	53,336
Goodwill (Wholesale Bank and Retail Bank)
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Losses resulting from nonrecurring fair value adjustments	$ 0	$ 0	$ 0	$ 1,784,936