Derivatives (Fair Values of Derivative Financial Instruments) (Details) - USD ($) $ in Thousands		9 Months Ended	12 Months Ended
		Sep. 30, 2022	Dec. 31, 2021
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		$ 8,576,234	$ 8,649,657
Fair Values, Assets		114,680	6,908
Fair Values, Assets	[1]	256,809	106,171
Less: netting adjustment	[1],[2]	(137,709)	(30,304)
Fair Values, Liabilities		37,879	22,244
Fair Values, Liabilities	[1]	315,135	96,580
Less: netting adjustment	[1],[2]	(88,697)	(61,534)
Other Assets [Member]
Derivatives Fair Value [Line Items]
Total derivative assets/liabilities	[1]	119,100	75,867
Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Total derivative assets/liabilities	[1]	226,438	35,046
Derivatives Designated as Hedging Instruments [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		2,984,900	2,962,650
Fair Values, Assets	[1]	62,610	28,022
Fair Values, Liabilities	[1]	122,433	15,111
Derivatives Not Designated as Hedging Instruments [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		5,591,334	5,687,007
Fair Values, Assets	[1]	194,199	78,149
Fair Values, Liabilities	[1]	192,702	81,469
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		5,046,771	5,193,991
Fair Values, Assets	[1]	188,799	75,819
Fair Values, Liabilities	[1]	185,546	75,861
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		286,091	217,437
Fair Values, Assets	[1]	1	11
Fair Values, Liabilities	[1]	9	35
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		18,517	46,739
Fair Values, Assets	[1]	158	1
Fair Values, Liabilities	[1]	69	645
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate-Lock Commitments on Residential Mortgage Loans [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		28,414	82,037
Fair Values, Assets	[1]	143	1,525
Fair Values, Liabilities	[1]	178	1
Derivatives Not Designated as Hedging Instruments [Member] | To Be Announced (TBA) Securities [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		15,000	55,000
Fair Values, Assets	[1]	431	15
Fair Values, Liabilities	[1]	4	53
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		153,430	48,364
Fair Values, Assets	[1]	4,667	778
Fair Values, Liabilities	[1]	4,601	758
Derivatives Not Designated as Hedging Instruments [Member] | Visa Class B derivative contract [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		43,111	43,439
Fair Values, Liabilities	[1]	2,295	4,116
Cash Flow Hedge [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Variable Rate Loans [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		2,050,000	1,125,000
Fair Values, Assets	[1]		5,884
Fair Values, Liabilities	[1]	$ 122,433	$ 4,421
Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Variable Rate Loans [Member]
Derivatives Fair Value [Line Items]
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other Assets	Other Assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Other Liabilities	Other Liabilities
Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Securities [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		$ 934,900	$ 1,837,650
Fair Values, Assets	[1]	$ 62,610	$ 22,138
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other Assets	Other Assets
Fair Values, Liabilities	[1]		$ 10,690
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Other Liabilities	Other Liabilities

[1] Derivative assets and liabilities are reported at fair value in other assets or other liabilities, respectively, in the consolidated balance sheets.

[2] Represents balance sheet netting of derivative assets and liabilities for variation margin collateral held or placed with the same central clearing counterparty. See offsetting assets and liabilities for further information.