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Fair Value Of Financial Instruments (Schedule Of Estimated Fair Value Of Financial Instruments) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Carrying (Reported) Amount, Fair Value Disclosure [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans $ 15,073,812 $ 14,737,817
Loans held for sale 6,214 13,809
Investments, Fair Value Disclosure 8,861,989 8,741,888
Federal funds sold 400 0
Securities purchased under agreements to resell 850,000 850,000
Interest earning deposits with banks 474,156 395,850
Cash and due from banks 401,185 491,615
Derivative Assets 250,450 105,674
Assets held in trust for deferred compensation plan 14,194 16,518
Assets, Fair Value Disclosure 25,932,400 25,353,171
Non-interest bearing deposits 6,952,236 6,890,687
Savings, interest checking and money market deposits 12,049,279 11,621,716
Certificates of deposits 1,774,348 2,008,012
Federal Funds Purchased, Fair Value Disclosure 18,720 20,035
SecuritiesSold under Agreements to Repurchase, Fair Value Disclosure 1,409,293 1,830,737
Other borrowings 754,976 988
Derivative Liabilities 20,443 10,219
Liabilities held in trust for deferred compensation plan 14,194 16,518
Financial Liabilities Fair Value Disclosure 22,993,489 22,398,912
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Business [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 5,773,865 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 873,402 899,377
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Real Estate - Business [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 2,960,308 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 2,464,819 2,354,760
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Consumer [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 1,941,787 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 349,735 349,251
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Consumer Credit Card [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 706,753 764,977
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Overdrafts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 3,143 6,304
Estimate of Fair Value, Fair Value Disclosure [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 14,960,463 14,602,286
Loans held for sale 6,214 13,809
Investments, Fair Value Disclosure 8,861,989 8,741,888
Federal funds sold 400 0
Securities purchased under agreements to resell 913,418 869,592
Interest earning deposits with banks 474,156 395,850
Cash and due from banks 401,185 491,615
Derivative Assets 250,450 105,674
Assets held in trust for deferred compensation plan 14,194 16,518
Assets, Fair Value Disclosure 25,882,469 25,237,232
Non-interest bearing deposits 6,952,236 6,890,687
Savings, interest checking and money market deposits 12,049,279 11,621,716
Certificates of deposits 1,794,039 2,022,629
Federal Funds Purchased, Fair Value Disclosure 18,720 20,035
SecuritiesSold under Agreements to Repurchase, Fair Value Disclosure 1,409,777 1,831,518
Other borrowings 754,976 988
Derivative Liabilities 20,443 10,219
Liabilities held in trust for deferred compensation plan 14,194 16,518
Financial Liabilities Fair Value Disclosure 23,013,664 22,414,310
Estimate of Fair Value, Fair Value Disclosure [Member] | Business [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 5,769,557 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 862,370 898,152
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Business [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 2,991,527 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 2,426,824 2,333,002
Estimate of Fair Value, Fair Value Disclosure [Member] | Consumer [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 1,909,021 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 344,821 344,424
Estimate of Fair Value, Fair Value Disclosure [Member] | Consumer Credit Card [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 654,065 708,209
Estimate of Fair Value, Fair Value Disclosure [Member] | Overdrafts [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Loans 2,278 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 843,080 854,705
Federal funds sold 400 0
Securities purchased under agreements to resell 0 0
Interest earning deposits with banks 474,156 395,850
Cash and due from banks 401,185 491,615
Derivative Assets 0 0
Assets held in trust for deferred compensation plan 14,194 16,518
Assets, Fair Value Disclosure 1,733,015 1,758,688
Non-interest bearing deposits 6,952,236 6,890,687
Savings, interest checking and money market deposits 12,049,279 11,621,716
Certificates of deposits 0 0
Federal Funds Purchased, Fair Value Disclosure 18,720 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 14,194 16,518
Financial Liabilities Fair Value Disclosure 19,034,429 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 6,214 13,809
Investments, Fair Value Disclosure 7,854,068 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 250,026 105,075
Assets held in trust for deferred compensation plan 0 0
Assets, Fair Value Disclosure 8,110,308 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 4,976 988
Derivative Liabilities 19,462 9,989
Liabilities held in trust for deferred compensation plan 0 0
Financial Liabilities Fair Value Disclosure 24,438 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 14,960,463 14,602,286
Loans held for sale 0 0
Investments, Fair Value Disclosure 164,841 149,025
Federal funds sold 0 0
Securities purchased under agreements to resell 913,418 869,592
Interest earning deposits with banks 0 0
Cash and due from banks 0 0
Derivative Assets 424 599
Assets held in trust for deferred compensation plan 0 0
Assets, Fair Value Disclosure 16,039,146 15,621,502
Non-interest bearing deposits 0 0
Savings, interest checking and money market deposits 0 0
Certificates of deposits 1,794,039 2,022,629
Federal Funds Purchased, Fair Value Disclosure 0 0
SecuritiesSold under Agreements to Repurchase, Fair Value Disclosure 1,409,777 1,831,518
Other borrowings 750,000 0
Derivative Liabilities 981 230
Liabilities held in trust for deferred compensation plan 0 0
Financial Liabilities Fair Value Disclosure 3,954,797 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 5,769,557 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 862,370 898,152
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 2,991,527 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 2,426,824 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 1,909,021 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 344,821 344,424
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 654,065 708,209
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 2,278 4,478
Securities purchased under agreements to resell 850,000 850,000
Interest earning deposits with banks 474,156 395,850
Cash and due from banks 401,185 491,615
Derivative Assets [1] 250,450 105,674
Assets held in trust for deferred compensation plan 14,194 16,518
Assets, Fair Value Disclosure 9,051,421 8,828,211
Non-interest bearing deposits 6,952,236 6,890,687
Savings, interest checking and money market deposits 12,049,279 11,621,716
Other borrowings 756,461 2,418
Derivative Liabilities [1] 20,443 10,219
Liabilities held in trust for deferred compensation plan 14,194 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 14,194 16,518
Assets, Fair Value Disclosure 857,274 871,223
Derivative Liabilities [1] 0 0
Liabilities held in trust for deferred compensation plan 14,194 16,518
Fair Value Hierarchy, Level 2 [Member]    
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]    
Derivative Assets [1] 250,026 105,075
Assets held in trust for deferred compensation plan 0 0
Assets, Fair Value Disclosure 8,104,202 7,852,414
Derivative Liabilities [1] 19,462 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] 424 599
Assets held in trust for deferred compensation plan 0 0
Assets, Fair Value Disclosure 89,945 104,574
Derivative Liabilities [1] 981 230
Liabilities held in trust for deferred compensation plan $ 0 $ 0
[1] * The fair value of each class of derivative is shown in Note 11.