Derivatives (Fair Values of Derivative Financial Instruments) (Details) - USD ($)		12 Months Ended
		Dec. 31, 2025	Dec. 31, 2024
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		$ 8,040,346,000	$ 7,392,532,000
Fair Values, Assets		46,120,000	71,893,000
Fair Values, Assets	[1]	105,612,000	150,253,000
Less: netting adjustments	[1],[2]	(42,486,000)	(76,413,000)
Total derivative assets/liabilities	[1]	63,126,000	73,840,000
Fair Values, Liabilities		36,259,000	54,707,000
Fair Values, Liabilities	[1]	95,373,000	160,623,000
Less: netting adjustments		(6,000)	0	[1],[2]
Other Liabilities [Member]
Derivatives Fair Value [Line Items]
Total derivative assets/liabilities	[1]	95,367,000	160,623,000
Derivatives Designated as Hedging Instruments [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		2,172,500,000	1,827,500,000
Fair Values, Assets	[1]	27,595,000	39,647,000
Fair Values, Liabilities	[1]	16,335,000	48,022,000
Derivatives Not Designated as Hedging Instruments [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		5,867,846,000	5,565,032,000
Fair Values, Assets	[1]	78,017,000	110,606,000
Fair Values, Liabilities	[1]	79,038,000	112,601,000
Derivatives Not Designated as Hedging Instruments [Member] | Interest Rate Swaps [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		5,308,711,000	4,926,461,000
Fair Values, Assets	[1]	73,725,000	108,702,000
Fair Values, Liabilities	[1]	73,829,000	108,761,000
Derivatives Not Designated as Hedging Instruments [Member] | Risk Participation Agreements [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		373,117,000	445,554,000
Fair Values, Assets	[1]	10,000	7,000
Fair Values, Liabilities	[1]	10,000	9,000
Derivatives Not Designated as Hedging Instruments [Member] | Forward Commitments to Sell Residential Mortgage Loans [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		9,081,000	25,526,000
Fair Values, Assets	[1]	2,000
Fair Values, Liabilities	[1]	108,000	383,000
Derivatives Not Designated as Hedging Instruments [Member] | To Be Announced (TBA) Securities [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		30,000,000	15,250,000
Fair Values, Assets	[1]	4,000	88,000
Fair Values, Liabilities	[1]	62,000	1,000
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		23,192,000	27,465,000
Fair Values, Assets	[1]	497,000	420,000
Fair Values, Liabilities	[1]		0
Derivatives Not Designated as Hedging Instruments [Member] | Foreign Exchange Forward Contracts [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		82,157,000	82,756,000
Fair Values, Assets	[1]	3,779,000	1,389,000
Fair Values, Liabilities	[1]	3,745,000	1,358,000
Derivatives Not Designated as Hedging Instruments [Member] | Visa Class B derivative contract [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		41,588,000	42,020,000
Fair Values, Liabilities	[1]	1,284,000	2,089,000
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		1,775,000,000	1,350,000,000
Fair Values, Assets	[1]	4,026,000
Fair Values, Liabilities	[1]	16,335,000	48,022,000
Fair Value Hedging [Member] | Derivatives Designated as Hedging Instruments [Member] | Interest Rate Swaps - Securities [Member]
Derivatives Fair Value [Line Items]
Notional or Contractual Amount		397,500,000	477,500,000
Fair Values, Assets	[1]	$ 23,569,000	$ 39,647,000

[1] Derivative assets and liabilities are reported 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.