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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. + 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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Balance Type: | credit
Period Type: | instant

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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