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Fair Value Of Financial Instruments (Schedule Of Estimated Fair Value Of Financial Instruments) (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans $ 16,420,927 $ 14,737,817
Loans held for sale 39,483 13,809
Investments, Fair Value Disclosure 11,691,601 8,741,888
Federal Funds Sold 2,275 0
Securities purchased under agreements to resell 850,000 850,000
Interest earning deposits with banks 1,171,697 395,850
Cash and due from banks 357,616 491,615
Derivative Assets 147,850 105,674
Assets held in trust for deferred compensation plan 17,294 16,518
Assets, Fair Value Disclosure 30,698,743 25,353,171
Non-interest bearing deposits 10,727,827 6,890,687
Savings, interest checking and money market deposits 12,983,505 11,621,716
Certificates of deposits 1,990,447 2,008,012
Federal Funds Purchased, Fair Value Disclosure 6,770 20,035
SecuritiesSold under Agreements to Repurchase, Fair Value Disclosure 1,646,294 1,830,737
Other borrowings 0 988
Derivative Liabilities 20,370 10,219
Liabilities held in trust for deferred compensation plan 17,294 16,518
Financial Liabilities Fair Value Disclosure 27,392,507 22,398,912
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Business [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 6,683,413 5,565,449
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Real Estate - Construction And Land [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 1,009,729 899,377
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Real Estate - Business [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 2,993,192 2,833,554
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Real Estate - Personal [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 2,753,867 2,354,760
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Consumer [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 2,006,360 1,964,145
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Revolving Home Equity [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 324,203 349,251
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Consumer Credit Card [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 647,893 764,977
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Overdrafts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 2,270 6,304
Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 16,245,472 14,602,286
Loans held for sale 39,483 13,809
Investments, Fair Value Disclosure 11,691,601 8,741,888
Federal Funds Sold 2,275 0
Securities purchased under agreements to resell 903,772 869,592
Interest earning deposits with banks 1,171,697 395,850
Cash and due from banks 357,616 491,615
Derivative Assets 147,850 105,674
Assets held in trust for deferred compensation plan 17,294 16,518
Assets, Fair Value Disclosure 30,577,060 25,237,232
Non-interest bearing deposits 10,727,827 6,890,687
Savings, interest checking and money market deposits 12,983,505 11,621,716
Certificates of deposits 2,002,118 2,022,629
Federal Funds Purchased, Fair Value Disclosure 6,770 20,035
SecuritiesSold under Agreements to Repurchase, Fair Value Disclosure 1,646,338 1,831,518
Other borrowings 0 988
Derivative Liabilities 20,370 10,219
Liabilities held in trust for deferred compensation plan 17,294 16,518
Financial Liabilities Fair Value Disclosure 27,404,222 22,414,310
Estimate of Fair Value, Fair Value Disclosure [Member] | Business [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 6,623,709 5,526,303
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Construction And Land [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 978,403 898,152
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Business [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 2,986,961 2,849,213
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Personal [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 2,766,421 2,333,002
Estimate of Fair Value, Fair Value Disclosure [Member] | Consumer [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 1,990,589 1,938,505
Estimate of Fair Value, Fair Value Disclosure [Member] | Revolving Home Equity [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 320,264 344,424
Estimate of Fair Value, Fair Value Disclosure [Member] | Consumer Credit Card [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 576,898 708,209
Estimate of Fair Value, Fair Value Disclosure [Member] | Overdrafts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 2,227 4,478
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 0 0
Loans held for sale 0 0
Investments, Fair Value Disclosure 837,861 854,705
Federal Funds Sold 2,275 0
Securities purchased under agreements to resell 0 0
Interest earning deposits with banks 1,171,697 395,850
Cash and due from banks 357,616 491,615
Derivative Assets 0 0
Assets held in trust for deferred compensation plan 17,294 16,518
Assets, Fair Value Disclosure 2,386,743 1,758,688
Non-interest bearing deposits 10,727,827 6,890,687
Savings, interest checking and money market deposits 12,983,505 11,621,716
Certificates of deposits 0 0
Federal Funds Purchased, Fair Value Disclosure 6,770 20,035
SecuritiesSold under Agreements to Repurchase, Fair Value Disclosure 0 0
Other borrowings 0 0
Derivative Liabilities 0 0
Liabilities held in trust for deferred compensation plan 17,294 16,518
Financial Liabilities Fair Value Disclosure 23,735,396 18,548,956
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Business [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Real Estate - Construction And Land [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Real Estate - Business [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Real Estate - Personal [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Consumer [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Revolving Home Equity [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Consumer Credit Card [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 1 [Member] | Overdrafts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 0 0
Loans held for sale 39,483 13,809
Investments, Fair Value Disclosure 10,721,942 7,738,158
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 Assets 144,273 105,075
Assets held in trust for deferred compensation plan 0 0
Assets, Fair Value Disclosure 10,905,698 7,857,042
Non-interest bearing deposits 0 0
Savings, interest checking and money market deposits 0 0
Certificates of deposits 0 0
Federal Funds Purchased, Fair Value Disclosure 0 0
SecuritiesSold under Agreements to Repurchase, Fair Value Disclosure 0 0
Other borrowings 0 988
Derivative Liabilities 19,185 9,989
Liabilities held in trust for deferred compensation plan 0 0
Financial Liabilities Fair Value Disclosure 19,185 10,977
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Business [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Real Estate - Construction And Land [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Real Estate - Business [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Real Estate - Personal [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Consumer [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Revolving Home Equity [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Consumer Credit Card [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 2 [Member] | Overdrafts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 0 0
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 16,245,472 14,602,286
Loans held for sale 0 0
Investments, Fair Value Disclosure 131,798 149,025
Federal Funds Sold 0 0
Securities purchased under agreements to resell 903,772 869,592
Interest earning deposits with banks 0 0
Cash and due from banks 0 0
Derivative Assets 3,577 599
Assets held in trust for deferred compensation plan 0 0
Assets, Fair Value Disclosure 17,284,619 15,621,502
Non-interest bearing deposits 0 0
Savings, interest checking and money market deposits 0 0
Certificates of deposits 2,002,118 2,022,629
Federal Funds Purchased, Fair Value Disclosure 0 0
SecuritiesSold under Agreements to Repurchase, Fair Value Disclosure 1,646,338 1,831,518
Other borrowings 0 0
Derivative Liabilities 1,185 230
Liabilities held in trust for deferred compensation plan 0 0
Financial Liabilities Fair Value Disclosure 3,649,641 3,854,377
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Business [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 6,623,709 5,526,303
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Construction And Land [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 978,403 898,152
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Business [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 2,986,961 2,849,213
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Real Estate - Personal [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 2,766,421 2,333,002
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Consumer [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 1,990,589 1,938,505
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Revolving Home Equity [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 320,264 344,424
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Consumer Credit Card [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 576,898 708,209
Estimate of Fair Value, Fair Value Disclosure [Member] | Fair Value Hierarchy, Level 3 [Member] | Overdrafts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 2,227 4,478
Interest earning deposits with banks 1,171,697 395,850
Cash and due from banks 357,616 491,615
Derivative Assets [1] 147,850 105,674
Assets held in trust for deferred compensation plan 17,294 16,518
Assets, Fair Value Disclosure 11,846,351 8,828,211
Non-interest bearing deposits 10,727,827 6,890,687
Savings, interest checking and money market deposits 12,983,505 11,621,716
Other borrowings 782 2,418
Derivative Liabilities [1] 20,370 10,219
Liabilities held in trust for deferred compensation plan 17,294 16,518
Fair Value Hierarchy, Level 1 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Assets [1] 0 0
Assets held in trust for deferred compensation plan 17,294 16,518
Assets, Fair Value Disclosure 855,155 871,223
Derivative Liabilities [1] 0 0
Liabilities held in trust for deferred compensation plan 17,294 16,518
Fair Value Hierarchy, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Assets [1] 144,273 105,075
Assets held in trust for deferred compensation plan 0 0
Assets, Fair Value Disclosure 10,901,291 7,852,414
Derivative Liabilities [1] 19,185 9,989
Liabilities held in trust for deferred compensation plan 0 0
Fair Value Hierarchy, Level 3 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Assets [1] 3,577 599
Assets held in trust for deferred compensation plan 0 0
Assets, Fair Value Disclosure 89,905 104,574
Derivative Liabilities [1] 1,185 230
Liabilities held in trust for deferred compensation plan $ 0 $ 0
[1] * The fair value of each class of derivative is shown in Note 11.