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Fair Value Of Financial Instruments (Schedule Of Estimated Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands | Jun. 30, 2025 | Dec. 31, 2024
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Carrying Amount |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | $ 17,665,468 | $ 17,220,103
Loans held for sale |  | 3,592 | 3,242
Investment securities |  | 9,227,413 | 9,453,297
Federal Funds Sold |  | 0 | 3,000
Securities purchased under agreements to resell |  | 850,000 | 625,000
Interest earning deposits with banks |  | 2,624,264 | 2,624,553
Cash and due from banks |  | 522,049 | 748,357
Derivative Asset |  | 74,222 | 62,648
Assets held in trust for deferred compensation plan |  | 22,456 | 21,849
Assets, Fair Value Financial Instruments |  | 30,989,464 | 30,762,049
Non-interest bearing deposits |  | 7,393,559 | 8,150,669
Savings, interest checking and money market deposits |  | 15,727,549 | 14,754,571
Certificates of deposits |  | 2,372,920 | 2,388,404
Federal funds purchased |  | 125,975 | 123,715
Securities sold under agreements to repurchase |  | 2,470,486 | 2,803,043
Other borrowings |  | 14,975 | 0
Derivative Liabilities |  | 23,277 | 26,963
Liabilities held in trust for deferred compensation plan |  | 22,456 | 21,849
Financial Liabilities Fair Value Disclosure |  | 28,151,197 | 28,269,214
Carrying Amount | Business Loan [Member] |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 6,328,684 | 6,053,820
Carrying Amount | Real estate - construction and land |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 1,405,398 | 1,409,901
Carrying Amount | Business Real Estate Loan [Member] |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 3,757,778 | 3,661,218
Carrying Amount | Personal Real Estate Loan [Member] |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 3,058,845 | 3,058,195
Carrying Amount | Consumer Loan [Member] |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 2,157,867 | 2,073,123
Carrying Amount | Revolving home equity |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 364,429 | 356,650
Carrying Amount | Credit Card Receivable [Member] |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 576,151 | 595,930
Carrying Amount | Overdrafts |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 16,316 | 11,266
Estimate of Fair Value Measurement [Member] |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 17,137,229 | 16,593,252
Loans held for sale |  | 3,592 | 3,242
Investment securities |  | 9,227,413 | 9,453,297
Federal Funds Sold |  | 0 | 3,000
Securities purchased under agreements to resell |  | 876,442 | 622,021
Interest earning deposits with banks |  | 2,624,264 | 2,624,553
Cash and due from banks |  | 522,049 | 748,357
Derivative Asset |  | 74,222 | 62,648
Assets held in trust for deferred compensation plan |  | 22,456 | 21,849
Assets, Fair Value Financial Instruments |  | 30,487,667 | 30,132,219
Non-interest bearing deposits |  | 7,393,559 | 8,150,669
Savings, interest checking and money market deposits |  | 15,727,549 | 14,754,571
Certificates of deposits |  | 2,399,532 | 2,409,537
Federal funds purchased |  | 125,975 | 123,715
Securities sold under agreements to repurchase |  | 2,473,298 | 2,806,428
Other borrowings |  | 14,975 | 0
Derivative Liabilities |  | 23,277 | 26,963
Liabilities held in trust for deferred compensation plan |  | 22,456 | 21,849
Financial Liabilities Fair Value Disclosure |  | 28,180,621 | 28,293,732
Estimate of Fair Value Measurement [Member] | Business Loan [Member] |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 6,254,565 | 5,943,565
Estimate of Fair Value Measurement [Member] | Real estate - construction and land |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 1,381,719 | 1,384,029
Estimate of Fair Value Measurement [Member] | Business Real Estate Loan [Member] |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 3,697,770 | 3,558,862
Estimate of Fair Value Measurement [Member] | Personal Real Estate Loan [Member] |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 2,762,320 | 2,738,880
Estimate of Fair Value Measurement [Member] | Consumer Loan [Member] |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 2,142,476 | 2,053,191
Estimate of Fair Value Measurement [Member] | Revolving home equity |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 361,334 | 353,731
Estimate of Fair Value Measurement [Member] | Credit Card Receivable [Member] |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 520,865 | 549,874
Estimate of Fair Value Measurement [Member] | Overdrafts |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 16,180 | 11,120
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 |  | 2,655,776 | 2,613,830
Federal Funds Sold |  | 0 | 3,000
Securities purchased under agreements to resell |  | 0 | 0
Interest earning deposits with banks |  | 2,624,264 | 2,624,553
Cash and due from banks |  | 522,049 | 748,357
Derivative Asset |  | 0 | 0
Assets held in trust for deferred compensation plan |  | 22,456 | 21,849
Assets, Fair Value Financial Instruments |  | 5,824,545 | 6,011,589
Non-interest bearing deposits |  | 7,393,559 | 8,150,669
Savings, interest checking and money market deposits |  | 15,727,549 | 14,754,571
Certificates of deposits |  | 0 | 0
Federal funds purchased |  | 125,975 | 123,715
Securities sold under agreements to repurchase |  | 0 | 0
Other borrowings |  | 359 | 0
Derivative Liabilities |  | 0 | 0
Liabilities held in trust for deferred compensation plan |  | 22,456 | 21,849
Financial Liabilities Fair Value Disclosure |  | 23,269,898 | 23,050,804
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 |  | 3,592 | 3,242
Investment securities |  | 6,350,781 | 6,608,452
Federal Funds Sold |  | 0 | 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 |  | 73,882 | 62,555
Assets held in trust for deferred compensation plan |  | 0 | 0
Assets, Fair Value Financial Instruments |  | 6,428,255 | 6,674,249
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 |  | 14,616 | 0
Derivative Liabilities |  | 23,150 | 26,905
Liabilities held in trust for deferred compensation plan |  | 0 | 0
Financial Liabilities Fair Value Disclosure |  | 37,766 | 26,905
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 |  | 17,137,229 | 16,593,252
Loans held for sale |  | 0 | 0
Investment securities |  | 220,856 | 231,015
Federal Funds Sold |  | 0 | 0
Securities purchased under agreements to resell |  | 876,442 | 622,021
Interest earning deposits with banks |  | 0 | 0
Cash and due from banks |  | 0 | 0
Derivative Asset |  | 340 | 93
Assets held in trust for deferred compensation plan |  | 0 | 0
Assets, Fair Value Financial Instruments |  | 18,234,867 | 17,446,381
Non-interest bearing deposits |  | 0 | 0
Savings, interest checking and money market deposits |  | 0 | 0
Certificates of deposits |  | 2,399,532 | 2,409,537
Federal funds purchased |  | 0 | 0
Securities sold under agreements to repurchase |  | 2,473,298 | 2,806,428
Other borrowings |  | 0 | 0
Derivative Liabilities |  | 127 | 58
Liabilities held in trust for deferred compensation plan |  | 0 | 0
Financial Liabilities Fair Value Disclosure |  | 4,872,957 | 5,216,023
Estimate of Fair Value Measurement [Member] | Significant Unobservable Inputs (Level 3) | Business Loan [Member] |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 6,254,565 | 5,943,565
Estimate of Fair Value Measurement [Member] | Significant Unobservable Inputs (Level 3) | Real estate - construction and land |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 1,381,719 | 1,384,029
Estimate of Fair Value Measurement [Member] | Significant Unobservable Inputs (Level 3) | Business Real Estate Loan [Member] |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 3,697,770 | 3,558,862
Estimate of Fair Value Measurement [Member] | Significant Unobservable Inputs (Level 3) | Personal Real Estate Loan [Member] |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 2,762,320 | 2,738,880
Estimate of Fair Value Measurement [Member] | Significant Unobservable Inputs (Level 3) | Consumer Loan [Member] |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 2,142,476 | 2,053,191
Estimate of Fair Value Measurement [Member] | Significant Unobservable Inputs (Level 3) | Revolving home equity |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 361,334 | 353,731
Estimate of Fair Value Measurement [Member] | Significant Unobservable Inputs (Level 3) | Credit Card Receivable [Member] |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 520,865 | 549,874
Estimate of Fair Value Measurement [Member] | Significant Unobservable Inputs (Level 3) | Overdrafts |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Loans |  | 16,180 | 11,120
Federal Funds Sold |  | 0 | 3,000
Securities purchased under agreements to resell |  | 850,000 | 625,000
Interest earning deposits with banks |  | 2,624,264 | 2,624,553
Cash and due from banks |  | 522,049 | 748,357
Derivative Asset | [1] | 74,222 | 62,648
Assets held in trust for deferred compensation plan |  | 22,456 | 21,849
Non-interest bearing deposits |  | 7,393,559 | 8,150,669
Savings, interest checking and money market deposits |  | 15,727,549 | 14,754,571
Other borrowings |  | 15,049 | 56
Derivative Liabilities | [1] | 23,277 | 26,963
Liabilities held in trust for deferred compensation plan |  | 22,456 | 21,849
Level 1 |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Derivative Asset | [1] | 0 | 0
Assets held in trust for deferred compensation plan |  | 22,456 | 21,849
Derivative Liabilities | [1] | 0 | 0
Liabilities held in trust for deferred compensation plan |  | 22,456 | 21,849
Level 2 |  |  |
Fair Value, Balance Sheet Grouping [Line Items] |  |  |
Derivative Asset | [1] | 73,882 | 62,555
Assets held in trust for deferred compensation plan |  | 0 | 0
Derivative Liabilities | [1] | 23,150 | 26,905
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] | 340 | 93
Assets held in trust for deferred compensation plan |  | 0 | 0
Derivative Liabilities | [1] | 127 | 58
Liabilities held in trust for deferred compensation plan |  | $ 0 | $ 0
[1] | * The fair value of each class of derivative is shown in Note 11.

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. + Details
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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(1)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147478546/942-210-S99-1 + Details
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X
- Definition 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. + References No definition available. + Details
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X
- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 210 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(17)) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480566/210-10-S99-1 + Details
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X
- Definition 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. 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