Fair Value Of Financial Instruments (Schedule Of Estimated Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands		Dec. 31, 2023	Dec. 31, 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Federal funds sold		$ 5,025	$ 49,505
Securities Purchased under Agreements to Resell		450,000	825,000
Interest-bearing Deposits in Banks and Other Financial Institutions		2,239,010	389,140
Cash and due from banks		443,147	452,496
Derivative Assets	[1]	116,876	60,492
Deferred Compensation Plan Assets		20,538	17,856
Non-interest bearing		7,975,935	10,066,356
Savings, interest checking and money market		14,512,273	15,126,981
Time Deposits		2,875,690
Other borrowings		1,404	9,672
Derivative Liability	[1]	37,899	54,984
Deferred Compensation Liability, Current and Noncurrent		$ 20,538	17,856
Derivative Liability, Statement of Financial Position [Extensible Enumeration]		Other liabilities
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Assets	[1]	$ 0	0
Deferred Compensation Plan Assets		20,538	17,856
Derivative Liability	[1]	0	0
Deferred Compensation Liability, Current and Noncurrent		20,538	17,856
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Assets	[1]	116,710	60,458
Deferred Compensation Plan Assets		0	0
Derivative Liability	[1]	37,704	54,865
Deferred Compensation Liability, Current and Noncurrent		0	0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Assets	[1]	166	34
Deferred Compensation Plan Assets		0	0
Derivative Liability	[1]	195	119
Deferred Compensation Liability, Current and Noncurrent		0	0
Estimate of Fair Value, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		16,347,391	15,645,261
Loans Held-for-sale, Fair Value Disclosure		4,177	4,964
Investments, Fair Value Disclosure		9,941,786	12,511,649
Federal funds sold		5,025	49,505
Securities Purchased under Agreements to Resell		444,448	795,574
Interest-bearing Deposits in Banks and Other Financial Institutions		2,239,010	389,140
Cash and due from banks		443,147	452,496
Derivative Assets		116,876	60,492
Deferred Compensation Plan Assets		20,538	17,856
Assets, Fair Value Financial Instruments		29,562,398	29,926,937
Non-interest bearing		7,975,935	10,066,356
Savings, interest checking and money market		14,512,273	15,126,981
Time Deposits		2,916,627	982,613
Federal Funds Purchased, Fair Value Disclosure		261,305	159,860
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure		2,650,951	2,684,471
Other borrowings		1,366	8,831
Derivative Liability		37,899	54,984
Deferred Compensation Liability, Current and Noncurrent		20,538	17,856
Financial Liabilities Fair Value Disclosure		28,376,894	29,101,952
Estimate of Fair Value, Fair Value Disclosure [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		0	0
Loans Held-for-sale, Fair Value Disclosure		0	0
Investments, Fair Value Disclosure		822,237	1,041,616
Federal funds sold		5,025	49,505
Securities Purchased under Agreements to Resell		0	0
Interest-bearing Deposits in Banks and Other Financial Institutions		2,239,010	389,140
Cash and due from banks		443,147	452,496
Derivative Assets		0	0
Deferred Compensation Plan Assets		20,538	17,856
Assets, Fair Value Financial Instruments		3,529,957	1,950,613
Non-interest bearing		7,975,935	10,066,356
Savings, interest checking and money market		14,512,273	15,126,981
Time Deposits		0	0
Federal Funds Purchased, Fair Value Disclosure		261,305	159,860
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure		0	0
Other borrowings		0	0
Derivative Liability		0	0
Deferred Compensation Liability, Current and Noncurrent		20,538	17,856
Financial Liabilities Fair Value Disclosure		22,770,051	25,371,053
Estimate of Fair Value, Fair Value Disclosure [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		0	0
Loans Held-for-sale, Fair Value Disclosure		4,177	4,964
Investments, Fair Value Disclosure		8,896,129	11,244,592
Federal funds sold		0	0
Securities Purchased under Agreements to Resell		0	0
Interest-bearing Deposits in Banks and Other Financial Institutions		0	0
Cash and due from banks		0	0
Derivative Assets		116,710	60,458
Deferred Compensation Plan Assets		0	0
Assets, Fair Value Financial Instruments		9,017,016	11,310,014
Non-interest bearing		0	0
Savings, interest checking and money market		0	0
Time Deposits		0	0
Federal Funds Purchased, Fair Value Disclosure		0	0
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure		0	0
Other borrowings		1,366	8,831
Derivative Liability		37,704	54,865
Deferred Compensation Liability, Current and Noncurrent		0	0
Financial Liabilities Fair Value Disclosure		39,070	63,696
Estimate of Fair Value, Fair Value Disclosure [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		16,347,391	15,645,261
Loans Held-for-sale, Fair Value Disclosure		0	0
Investments, Fair Value Disclosure		223,420	225,441
Federal funds sold		0	0
Securities Purchased under Agreements to Resell		444,448	795,574
Interest-bearing Deposits in Banks and Other Financial Institutions		0	0
Cash and due from banks		0	0
Derivative Assets		166	34
Deferred Compensation Plan Assets		0	0
Assets, Fair Value Financial Instruments		17,015,425	16,666,310
Non-interest bearing		0	0
Savings, interest checking and money market		0	0
Time Deposits		2,916,627	982,613
Federal Funds Purchased, Fair Value Disclosure		0	0
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure		2,650,951	2,684,471
Other borrowings		0	0
Derivative Liability		195	119
Deferred Compensation Liability, Current and Noncurrent		0	0
Financial Liabilities Fair Value Disclosure		5,567,773	3,667,203
Estimate of Fair Value, Fair Value Disclosure [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		5,873,549	5,506,128
Estimate of Fair Value, Fair Value Disclosure [Member] | Business [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Business [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Business [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		5,873,549	5,506,128
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 Receivable, Fair Value Disclosure		1,420,522	1,347,328
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Construction And Land [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Construction And Land [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Construction And Land [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		1,420,522	1,347,328
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		3,594,834	3,289,655
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Business [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Business [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Business [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		3,594,834	3,289,655
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		2,568,026	2,654,423
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Personal [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Personal [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Real Estate - Personal [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		2,568,026	2,654,423
Estimate of Fair Value, Fair Value Disclosure [Member] | Consumer Loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		2,016,334	1,999,788
Estimate of Fair Value, Fair Value Disclosure [Member] | Consumer Loan [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Consumer Loan [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Consumer Loan [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		2,016,334	1,999,788
Estimate of Fair Value, Fair Value Disclosure [Member] | Revolving Home Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		317,013	295,005
Estimate of Fair Value, Fair Value Disclosure [Member] | Revolving Home Equity [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Revolving Home Equity [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Revolving Home Equity [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		317,013	295,005
Estimate of Fair Value, Fair Value Disclosure [Member] | Consumer Credit Card [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		550,464	538,268
Estimate of Fair Value, Fair Value Disclosure [Member] | Consumer Credit Card [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Consumer Credit Card [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Consumer Credit Card [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		550,464	538,268
Estimate of Fair Value, Fair Value Disclosure [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		6,649	14,666
Estimate of Fair Value, Fair Value Disclosure [Member] | Overdrafts [Member] | Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Overdrafts [Member] | Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		0	0
Estimate of Fair Value, Fair Value Disclosure [Member] | Overdrafts [Member] | Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		6,649	14,666
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		17,205,479	16,303,131
Loans Held-for-sale, Fair Value Disclosure		4,177	4,964
Investments, Fair Value Disclosure		9,941,786	12,511,649
Federal funds sold		5,025	49,505
Securities Purchased under Agreements to Resell		450,000	825,000
Interest-bearing Deposits in Banks and Other Financial Institutions		2,239,010	389,140
Cash and due from banks		443,147	452,496
Derivative Assets		116,876	60,492
Deferred Compensation Plan Assets		20,538	17,856
Assets, Fair Value Financial Instruments		30,426,038	30,614,233
Non-interest bearing		7,975,935	10,066,356
Savings, interest checking and money market		14,512,273	15,126,981
Time Deposits		2,875,690	994,103
Federal Funds Purchased, Fair Value Disclosure		261,305	159,860
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure		2,647,510	2,681,874
Other borrowings		1,366	8,831
Derivative Liability		37,899	54,984
Deferred Compensation Liability, Current and Noncurrent		20,538	17,856
Financial Liabilities Fair Value Disclosure		28,332,516	29,110,845
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		6,019,036	5,661,725
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Real Estate - Construction And Land [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		1,446,764	1,361,095
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Real Estate - Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		3,719,306	3,406,981
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Real Estate - Personal [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		3,026,041	2,918,078
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Consumer Loan [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		2,077,723	2,059,088
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Revolving Home Equity [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		319,894	297,207
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Consumer Credit Card [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		589,913	584,000
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		$ 6,802	$ 14,957

[1] *The fair value of each class of derivative is shown in Note 19.