Derivatives (Fair Values of Derivative Financial Instruments) (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2023	Dec. 31, 2022
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		$ 7,691,719	$ 7,936,239
Fair Values, Assets		84,458	110,734
Fair Values, Assets		$ 156,360	$ 219,935
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other Assets	Other Assets
Less: netting adjustments	[1]	$ (65,648)	$ (110,438)
Total derivate assets/liabilities		90,712	109,497
Fair Values, Liabilities		87,567	32,601
Fair Values, Liabilities	[2]	207,138	285,592
Less: netting adjustments	[1],[2]		(81,471)
Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Total derivate assets/liabilities	[2]	207,138	204,121
Derivatives Designated as Hedging Instruments [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		2,027,500	2,816,000
Fair Values, Assets		22,819	45,802
Fair Values, Liabilities	[2]	73,611	112,262
Derivatives Not Designated as Hedging Instruments [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		5,664,219	5,120,239
Fair Values, Assets		133,541	174,133
Fair Values, Liabilities	[2]	133,527	173,330
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		5,128,144	4,620,544
Fair Values, Assets		131,271	172,242
Fair Values, Liabilities	[2]	129,994	169,712
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		364,906	298,729
Fair Values, Assets		34	1
Fair Values, Liabilities	[2]	18	13
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		13,355	10,930
Fair Values, Assets			8
Fair Values, Liabilities	[2]	286	113
Derivatives Not Designated as Hedging Instruments [Member] | To Be Announced (TBA) Securities [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		13,500	10,000
Fair Values, Assets			78
Fair Values, Liabilities	[2]	47	7
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		18,563	13,819
Fair Values, Assets		372	161
Fair Values, Liabilities	[2]		8
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		83,134	123,106
Fair Values, Assets		1,864	1,643
Fair Values, Liabilities	[2]	1,840	1,594
Derivatives Not Designated as Hedging Instruments [Member] | Visa Class B derivative contract [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		42,617	43,111
Fair Values, Liabilities	[2]	1,342	1,883
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		1,550,000	2,100,000
Fair Values, Assets			2,301
Fair Values, Liabilities	[2]	$ 73,611	$ 112,262
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		$ 477,500	$ 716,000
Fair Values, Assets		$ 22,819	$ 43,501
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other Assets	Other Assets
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Other Liabilities	Other Liabilities

[1] 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.

[2] Derivative assets and liabilities are reported in other assets or other liabilities, respectively, in the consolidated balance sheets.