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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.