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Fair Value Of Financial Instruments (Schedule Of Estimated Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands		Mar. 31, 2026	Dec. 31, 2025
Carrying Amount
Fair Value, Balance Sheet Grouping [Line Items]
Loans		$ 20,461,064	$ 17,771,263
Loans held for sale		2,081	4,329
Investment securities		8,984,988	9,413,603
Federal Funds Sold		630
Securities purchased under agreements to resell		850,000	850,000
Interest earning deposits with banks		3,270,046	2,744,393
Cash and due from banks		572,588	803,239
Derivative Asset		58,399	51,421
Assets held in trust for deferred compensation plan		22,437	23,276
Assets, Fair Value Financial Instruments		34,222,233	31,661,524
Non-interest bearing deposits		8,058,024	8,205,711
Savings, interest checking and money market deposits		17,877,836	15,047,406
Certificates of deposits		2,448,459	2,386,459
Federal funds purchased		129,730	128,625
Securities sold under agreements to repurchase		2,446,993	2,861,016
Other borrowings		7,994	12,739
Derivative Liabilities		15,726	18,795
Liabilities held in trust for deferred compensation plan		22,437	23,276
Financial Liabilities Fair Value Disclosure		31,007,199	28,684,027
Carrying Amount | Business Loan [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		6,750,356	6,439,380
Carrying Amount | Real estate - construction and land
Fair Value, Balance Sheet Grouping [Line Items]
Loans		1,581,789	1,438,012
Carrying Amount | Business Real Estate Loan [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		4,059,539	3,674,567
Carrying Amount | Personal Real Estate Loan [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		4,407,606	3,053,435
Carrying Amount | Consumer Loan [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		2,475,353	2,196,822
Carrying Amount | Revolving home equity
Fair Value, Balance Sheet Grouping [Line Items]
Loans		619,178	375,159
Carrying Amount | Credit Card Receivable [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		557,733	589,694
Carrying Amount | Overdrafts
Fair Value, Balance Sheet Grouping [Line Items]
Loans		9,510	4,194
Estimate of Fair Value Measurement [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		19,897,218	17,327,602
Loans held for sale		2,081	4,329
Investment securities		8,984,988	9,413,603
Federal Funds Sold		630
Securities purchased under agreements to resell		862,125	869,427
Interest earning deposits with banks		3,270,046	2,744,393
Cash and due from banks		572,588	803,239
Derivative Asset		58,399	51,421
Assets held in trust for deferred compensation plan		22,437	23,276
Assets, Fair Value Financial Instruments		33,670,512	31,237,290
Non-interest bearing deposits		8,058,024	8,205,711
Savings, interest checking and money market deposits		17,877,836	15,047,406
Certificates of deposits		2,477,568	2,418,268
Federal funds purchased		129,730	128,625
Securities sold under agreements to repurchase		2,449,446	2,863,921
Other borrowings		7,994	12,739
Derivative Liabilities		15,726	18,795
Liabilities held in trust for deferred compensation plan		22,437	23,276
Financial Liabilities Fair Value Disclosure		31,038,761	28,718,741
Estimate of Fair Value Measurement [Member] | Business Loan [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		6,659,674	6,367,754
Estimate of Fair Value Measurement [Member] | Real estate - construction and land
Fair Value, Balance Sheet Grouping [Line Items]
Loans		1,552,932	1,415,490
Estimate of Fair Value Measurement [Member] | Business Real Estate Loan [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		3,985,397	3,628,499
Estimate of Fair Value Measurement [Member] | Personal Real Estate Loan [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		4,120,937	2,815,384
Estimate of Fair Value Measurement [Member] | Consumer Loan [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		2,456,330	2,188,772
Estimate of Fair Value Measurement [Member] | Revolving home equity
Fair Value, Balance Sheet Grouping [Line Items]
Loans		604,966	371,998
Estimate of Fair Value Measurement [Member] | Credit Card Receivable [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		507,590	535,660
Estimate of Fair Value Measurement [Member] | Overdrafts
Fair Value, Balance Sheet Grouping [Line Items]
Loans		9,392	4,045
Estimate of Fair Value Measurement [Member] | Level 1
Fair Value, Balance Sheet Grouping [Line Items]
Loans		0	0
Loans held for sale		0	0
Investment securities		3,206,719	3,339,866
Federal Funds Sold		630
Securities purchased under agreements to resell		0	0
Interest earning deposits with banks		3,270,046	2,744,393
Cash and due from banks		572,588	803,239
Derivative Asset		0	0
Assets held in trust for deferred compensation plan		22,437	23,276
Assets, Fair Value Financial Instruments		7,072,420	6,910,774
Non-interest bearing deposits		8,058,024	8,205,711
Savings, interest checking and money market deposits		17,877,836	15,047,406
Certificates of deposits		0	0
Federal funds purchased		129,730	128,625
Securities sold under agreements to repurchase		0	0
Other borrowings		2,589	12,739
Derivative Liabilities		0	0
Liabilities held in trust for deferred compensation plan		22,437	23,276
Financial Liabilities Fair Value Disclosure		26,090,616	23,417,757
Estimate of Fair Value Measurement [Member] | Level 1 | Business Loan [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		0	0
Estimate of Fair Value Measurement [Member] | Level 1 | Real estate - construction and land
Fair Value, Balance Sheet Grouping [Line Items]
Loans		0	0
Estimate of Fair Value Measurement [Member] | Level 1 | Business Real Estate Loan [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		0	0
Estimate of Fair Value Measurement [Member] | Level 1 | Personal Real Estate Loan [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		0	0
Estimate of Fair Value Measurement [Member] | Level 1 | Consumer Loan [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		0	0
Estimate of Fair Value Measurement [Member] | Level 1 | Revolving home equity
Fair Value, Balance Sheet Grouping [Line Items]
Loans		0	0
Estimate of Fair Value Measurement [Member] | Level 1 | Credit Card Receivable [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		0	0
Estimate of Fair Value Measurement [Member] | Level 1 | Overdrafts
Fair Value, Balance Sheet Grouping [Line Items]
Loans		0	0
Estimate of Fair Value Measurement [Member] | Level 2
Fair Value, Balance Sheet Grouping [Line Items]
Loans		0	0
Loans held for sale		2,081	4,329
Investment securities		5,528,980	5,842,326
Federal Funds Sold		0
Securities purchased under agreements to resell		0	0
Interest earning deposits with banks		0	0
Cash and due from banks		0	0
Derivative Asset		58,216	51,232
Assets held in trust for deferred compensation plan		0	0
Assets, Fair Value Financial Instruments		5,589,277	5,897,887
Non-interest bearing deposits		0	0
Savings, interest checking and money market deposits		0	0
Certificates of deposits		0	0
Federal funds purchased		0	0
Securities sold under agreements to repurchase		0	0
Other borrowings		5,405	0
Derivative Liabilities		15,666	18,718
Liabilities held in trust for deferred compensation plan		0	0
Financial Liabilities Fair Value Disclosure		21,071	18,718
Estimate of Fair Value Measurement [Member] | Level 2 | Business Loan [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		0	0
Estimate of Fair Value Measurement [Member] | Level 2 | Real estate - construction and land
Fair Value, Balance Sheet Grouping [Line Items]
Loans		0	0
Estimate of Fair Value Measurement [Member] | Level 2 | Business Real Estate Loan [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		0	0
Estimate of Fair Value Measurement [Member] | Level 2 | Personal Real Estate Loan [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		0	0
Estimate of Fair Value Measurement [Member] | Level 2 | Consumer Loan [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		0	0
Estimate of Fair Value Measurement [Member] | Level 2 | Revolving home equity
Fair Value, Balance Sheet Grouping [Line Items]
Loans		0	0
Estimate of Fair Value Measurement [Member] | Level 2 | Credit Card Receivable [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		0	0
Estimate of Fair Value Measurement [Member] | Level 2 | Overdrafts
Fair Value, Balance Sheet Grouping [Line Items]
Loans		0	0
Estimate of Fair Value Measurement [Member] | Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping [Line Items]
Loans		19,897,218	17,327,602
Loans held for sale		0	0
Investment securities		249,289	231,411
Federal Funds Sold		0
Securities purchased under agreements to resell		862,125	869,427
Interest earning deposits with banks		0	0
Cash and due from banks		0	0
Derivative Asset		183	189
Assets held in trust for deferred compensation plan		0	0
Assets, Fair Value Financial Instruments		21,008,815	18,428,629
Non-interest bearing deposits		0	0
Savings, interest checking and money market deposits		0	0
Certificates of deposits		2,477,568	2,418,268
Federal funds purchased		0	0
Securities sold under agreements to repurchase		2,449,446	2,863,921
Other borrowings		0	0
Derivative Liabilities		60	77
Liabilities held in trust for deferred compensation plan		0	0
Financial Liabilities Fair Value Disclosure		4,927,074	5,282,266
Estimate of Fair Value Measurement [Member] | Significant Unobservable Inputs (Level 3) | Business Loan [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		6,659,674	6,367,754
Estimate of Fair Value Measurement [Member] | Significant Unobservable Inputs (Level 3) | Real estate - construction and land
Fair Value, Balance Sheet Grouping [Line Items]
Loans		1,552,932	1,415,490
Estimate of Fair Value Measurement [Member] | Significant Unobservable Inputs (Level 3) | Business Real Estate Loan [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		3,985,397	3,628,499
Estimate of Fair Value Measurement [Member] | Significant Unobservable Inputs (Level 3) | Personal Real Estate Loan [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		4,120,937	2,815,384
Estimate of Fair Value Measurement [Member] | Significant Unobservable Inputs (Level 3) | Consumer Loan [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		2,456,330	2,188,772
Estimate of Fair Value Measurement [Member] | Significant Unobservable Inputs (Level 3) | Revolving home equity
Fair Value, Balance Sheet Grouping [Line Items]
Loans		604,966	371,998
Estimate of Fair Value Measurement [Member] | Significant Unobservable Inputs (Level 3) | Credit Card Receivable [Member]
Fair Value, Balance Sheet Grouping [Line Items]
Loans		507,590	535,660
Estimate of Fair Value Measurement [Member] | Significant Unobservable Inputs (Level 3) | Overdrafts
Fair Value, Balance Sheet Grouping [Line Items]
Loans		9,392	4,045
Federal Funds Sold		630	0
Securities purchased under agreements to resell		850,000	850,000
Interest earning deposits with banks		3,270,046	2,744,393
Cash and due from banks		572,588	803,239
Derivative Asset	[1]	58,399	51,421
Assets held in trust for deferred compensation plan		22,437	23,276
Non-interest bearing deposits		8,058,024	8,205,711
Savings, interest checking and money market deposits		17,877,836	15,047,406
Other borrowings		8,045	12,798
Derivative Liabilities	[1]	15,726	18,795
Liabilities held in trust for deferred compensation plan		22,437	23,276
Level 1
Fair Value, Balance Sheet Grouping [Line Items]
Derivative Asset	[1]	0	0
Assets held in trust for deferred compensation plan		22,437	23,276
Derivative Liabilities	[1]	0	0
Liabilities held in trust for deferred compensation plan		22,437	23,276
Level 2
Fair Value, Balance Sheet Grouping [Line Items]
Derivative Asset	[1]	58,216	51,232
Assets held in trust for deferred compensation plan		0	0
Derivative Liabilities	[1]	15,666	18,718
Liabilities held in trust for deferred compensation plan		0	0
Significant Unobservable Inputs (Level 3)
Fair Value, Balance Sheet Grouping [Line Items]
Derivative Asset	[1]	183	189
Assets held in trust for deferred compensation plan		0	0
Derivative Liabilities	[1]	60	77
Liabilities held in trust for deferred compensation plan		$ 0	$ 0
[1] * The fair value of each class of derivative is shown in Note 12.

X

- Definition

Fair value estimates are made at a specific point in time based on relevant market information. They do not reflect any premium or discount that could result from offering for sale at one time the Company’s entire holdings of a particular financial instrument. Because no market exists for many of the Company’s financial instruments, fair value estimates are based on judgments regarding future expected loss experience, risk characteristics and economic conditions. These estimates are subjective, involve uncertainties, and cannot be determined with precision. Changes in assumptions could significantly affect the estimates.

+ References

No definition available.

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X

- Definition

For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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