Derivative and Hedging Activities Income impact of Fair Value and Cash Flow Hedge (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Dec. 31, 2020
Fair Value, Inputs, Level 3
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset	$ 4,255		$ 0
Derivatives (trading liabilities)	0		2,046
Interest rate lock commitments (mortgage) | Fair Value, Inputs, Level 2 | Fair Value, Measurements, Recurring
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset	3,044		4,909
Derivatives (trading liabilities)	2,828		4,836
Interest Rate Lock Commitments and Forward Commitments Total | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset	11,171
Mortgage banking(a)(b) | Fair Value, Inputs, Level 3 | Fair Value, Measurements, Recurring
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivative Asset	6,917		9,624
Other Assets [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives (trading and other assets), fair value	141,043		219,537
Derivative Asset	136,819		206,722
Other Liabilities [Member]
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Derivatives (trading and other liabilities), fair value	36,308		43,716
Derivatives (trading liabilities)	16,082		$ 16,155
Interest Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(485)	$ (322)
Other Income (Expense)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	0	(262)
Not Designated as Hedging Instrument, Economic Hedge [Member] | Interest Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	(485)	(322)
Not Designated as Hedging Instrument, Economic Hedge [Member] | Other Income (Expense)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	0	(262)
Designated as Hedging Instrument | Interest Income
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	0	0
Designated as Hedging Instrument | Other Income (Expense)
Derivative Instruments and Hedging Activities Disclosures [Line Items]
Change in Unrealized Gain (Loss) on Hedged Item in Fair Value Hedge	$ 0	$ 0