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Fair Value Of Financial Instruments (Schedule Of Estimated Fair Value Of Financial Instruments) (Details) - USD ($)
$ in Thousands
Jun. 30, 2020
Dec. 31, 2019
Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans $ 16,395,054 $ 14,737,817
Loans held for sale 12,785 13,809
Investments, Fair Value Disclosure 10,468,129 8,741,888
Securities purchased under agreements to resell 850,000 850,000
Interest earning deposits with banks 1,404,968 395,850
Cash and due from banks 391,268 491,615
Derivative Assets 269,010 105,674
Assets held in trust for deferred compensation plan 16,310 16,518
Assets, Fair Value Disclosure 29,807,524 25,353,171
Non-interest bearing deposits 9,700,261 6,890,687
Savings, interest checking and money market deposits 12,792,993 11,621,716
Certificates of deposits 2,033,713 2,008,012
Federal Funds Purchased, Fair Value Disclosure 36,965 20,035
SecuritiesSold under Agreements to Repurchase, Fair Value Disclosure 1,703,473 1,830,737
Other borrowings 0 988
Derivative Liabilities 21,373 10,219
Liabilities held in trust for deferred compensation plan 16,310 16,518
Financial Liabilities Fair Value Disclosure 26,305,088 22,398,912
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Business [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 6,858,217 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 932,022 899,377
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Real Estate - Business [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 2,941,163 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 2,690,542 2,354,760
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Consumer [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 1,966,707 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 334,627 349,251
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Consumer Credit Card [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 666,597 764,977
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Overdrafts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 5,179 6,304
Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 16,219,775 14,602,286
Loans held for sale 12,785 13,809
Investments, Fair Value Disclosure 10,468,129 8,741,888
Securities purchased under agreements to resell 912,674 869,592
Interest earning deposits with banks 1,404,968 395,850
Cash and due from banks 391,268 491,615
Derivative Assets 269,010 105,674
Assets held in trust for deferred compensation plan 16,310 16,518
Assets, Fair Value Disclosure 29,694,919 25,237,232
Non-interest bearing deposits 9,700,261 6,890,687
Savings, interest checking and money market deposits 12,792,993 11,621,716
Certificates of deposits 2,051,053 2,022,629
Federal Funds Purchased, Fair Value Disclosure 36,965 20,035
SecuritiesSold under Agreements to Repurchase, Fair Value Disclosure 1,703,547 1,831,518
Other borrowings 0 988
Derivative Liabilities 21,373 10,219
Liabilities held in trust for deferred compensation plan 16,310 16,518
Financial Liabilities Fair Value Disclosure 26,322,502 22,414,310
Estimate of Fair Value, Fair Value Disclosure [Member] | Business [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 6,810,070 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 905,629 898,152
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Business [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 2,928,213 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 2,699,804 2,333,002
Estimate of Fair Value, Fair Value Disclosure [Member] | Consumer [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 1,951,111 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 330,906 344,424
Estimate of Fair Value, Fair Value Disclosure [Member] | Consumer Credit Card [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 589,031 708,209
Estimate of Fair Value, Fair Value Disclosure [Member] | Overdrafts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 5,011 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 829,205 854,705
Securities purchased under agreements to resell 0 0
Interest earning deposits with banks 1,404,968 395,850
Cash and due from banks 391,268 491,615
Derivative Assets 0 0
Assets held in trust for deferred compensation plan 16,310 16,518
Assets, Fair Value Disclosure 2,641,751 1,758,688
Non-interest bearing deposits 9,700,261 6,890,687
Savings, interest checking and money market deposits 12,792,993 11,621,716
Certificates of deposits 0 0
Federal Funds Purchased, Fair Value Disclosure 36,965 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 16,310 16,518
Financial Liabilities Fair Value Disclosure 22,546,529 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 12,785 13,809
Investments, Fair Value Disclosure 9,510,256 7,738,158
Securities purchased under agreements to resell 0 0
Interest earning deposits with banks 0 0
Cash and due from banks 0 0
Derivative Assets 266,028 105,075
Assets held in trust for deferred compensation plan 0 0
Assets, Fair Value Disclosure 9,789,069 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 20,279 9,989
Liabilities held in trust for deferred compensation plan 0 0
Financial Liabilities Fair Value Disclosure 20,279 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 16,219,775 14,602,286
Loans held for sale 0 0
Investments, Fair Value Disclosure 128,668 149,025
Securities purchased under agreements to resell 912,674 869,592
Interest earning deposits with banks 0 0
Cash and due from banks 0 0
Derivative Assets 2,982 599
Assets held in trust for deferred compensation plan 0 0
Assets, Fair Value Disclosure 17,264,099 15,621,502
Non-interest bearing deposits 0 0
Savings, interest checking and money market deposits 0 0
Certificates of deposits 2,051,053 2,022,629
Federal Funds Purchased, Fair Value Disclosure 0 0
SecuritiesSold under Agreements to Repurchase, Fair Value Disclosure 1,703,547 1,831,518
Other borrowings 0 0
Derivative Liabilities 1,094 230
Liabilities held in trust for deferred compensation plan 0 0
Financial Liabilities Fair Value Disclosure 3,755,694 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 6,810,070 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 905,629 898,152
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 2,928,213 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 2,699,804 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 1,951,111 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 330,906 344,424
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 589,031 708,209
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 5,011 4,478
Interest earning deposits with banks 1,404,968 395,850
Cash and due from banks 391,268 491,615
Derivative Assets [1] 269,010 105,674
Assets held in trust for deferred compensation plan 16,310 16,518
Assets, Fair Value Disclosure 10,714,971 8,828,211
Non-interest bearing deposits 9,700,261 6,890,687
Savings, interest checking and money market deposits 12,792,993 11,621,716
Other borrowings 1,475 2,418
Derivative Liabilities [1] 21,373 10,219
Liabilities held in trust for deferred compensation plan 16,310 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 16,310 16,518
Assets, Fair Value Disclosure 845,515 871,223
Derivative Liabilities [1] 0 0
Liabilities held in trust for deferred compensation plan 16,310 16,518
Fair Value Hierarchy, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Assets [1] 266,028 105,075
Assets held in trust for deferred compensation plan 0 0
Assets, Fair Value Disclosure 9,783,138 7,852,414
Derivative Liabilities [1] 20,279 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] 2,982 599
Assets held in trust for deferred compensation plan 0 0
Assets, Fair Value Disclosure 86,318 104,574
Derivative Liabilities [1] 1,094 230
Liabilities held in trust for deferred compensation plan $ 0 $ 0
[1] * The fair value of each class of derivative is shown in Note 11.