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Fair Value Of Financial Instruments (Schedule Of Estimated Fair Value Of Financial Instruments) (Details) - USD ($) $ in Thousands		Dec. 31, 2020	Dec. 31, 2019
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Held-for-sale, Fair Value Disclosure		$ 39,400
Interest-bearing Deposits in Banks and Other Financial Institutions		1,747,363	$ 395,850
Cash and due from banks		437,563	491,615
Derivative Assets	[1]	89,889	105,674
Deferred Compensation Plan Assets		19,278	16,518
Total Assets		12,730,482	8,828,211
Non-interest bearing		10,497,598	6,890,687
Savings, interest checking and money market		14,604,456	11,621,716
Time Deposits		1,844,691
Other borrowings		802	2,418
Derivative Liability	[1]	18,675	10,219
Deferred Compensation Liability, Current and Noncurrent		19,278	16,518
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		19,278	16,518
Total Assets		860,303	871,223
Derivative Liability	[1]	0	0
Deferred Compensation Liability, Current and Noncurrent		19,278	16,518
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Derivative Assets	[1]	86,447	105,075
Deferred Compensation Plan Assets		0	0
Total Assets		11,764,401	7,852,414
Derivative Liability	[1]	17,974	9,989
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]	3,442	599
Deferred Compensation Plan Assets		0	0
Total Assets		105,778	104,574
Derivative Liability	[1]	701	230
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		16,147,581	14,602,286
Loans Held-for-sale, Fair Value Disclosure		45,089	13,809
Investments, Fair Value Disclosure		12,626,296	8,740,608
Securities Purchased under Agreements to Resell		894,338	869,592
Interest-bearing Deposits in Banks and Other Financial Institutions		1,747,363	395,850
Cash and due from banks		437,563	491,615
Derivative Assets		89,889	105,674
Deferred Compensation Plan Assets		19,278	16,518
Total Assets		32,007,397	25,235,952
Non-interest bearing		10,497,598	6,890,687
Savings, interest checking and money market		14,604,456	11,621,716
Time Deposits		1,847,277	2,022,629
Federal Funds Purchased, Fair Value Disclosure		42,270	20,035
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure		2,056,173	1,831,518
Other borrowings		0	988
Derivative Liability		18,675	10,219
Deferred Compensation Liability, Current and Noncurrent		19,278	16,518
Financial Liabilities Fair Value Disclosure		29,085,727	22,414,310
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		841,025	854,705
Securities Purchased under Agreements to Resell		0	0
Interest-bearing Deposits in Banks and Other Financial Institutions		1,747,363	395,850
Cash and due from banks		437,563	491,615
Derivative Assets		0	0
Deferred Compensation Plan Assets		19,278	16,518
Total Assets		3,045,229	1,758,688
Non-interest bearing		10,497,598	6,890,687
Savings, interest checking and money market		14,604,456	11,621,716
Time Deposits		0	0
Federal Funds Purchased, Fair Value Disclosure		42,270	20,035
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		19,278	16,518
Financial Liabilities Fair Value Disclosure		25,163,602	18,548,956
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		45,089	13,809
Investments, Fair Value Disclosure		11,638,558	7,738,158
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		86,447	105,075
Deferred Compensation Plan Assets		0	0
Total Assets		11,770,094	7,857,042
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		0	988
Derivative Liability		17,974	9,989
Deferred Compensation Liability, Current and Noncurrent		0	0
Financial Liabilities Fair Value Disclosure		17,974	10,977
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		16,147,581	14,602,286
Loans Held-for-sale, Fair Value Disclosure		0	0
Investments, Fair Value Disclosure		146,713	147,745
Securities Purchased under Agreements to Resell		894,338	869,592
Interest-bearing Deposits in Banks and Other Financial Institutions		0	0
Cash and due from banks		0	0
Derivative Assets		3,442	599
Deferred Compensation Plan Assets		0	0
Total Assets		17,192,074	15,620,222
Non-interest bearing		0	0
Savings, interest checking and money market		0	0
Time Deposits		1,847,277	2,022,629
Federal Funds Purchased, Fair Value Disclosure		0	0
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure		2,056,173	1,831,518
Other borrowings		0	0
Derivative Liability		701	230
Deferred Compensation Liability, Current and Noncurrent		0	0
Financial Liabilities Fair Value Disclosure		3,904,151	3,854,377
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		6,467,572	5,526,303
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		6,467,572	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 Receivable, Fair Value Disclosure		995,873	898,152
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		995,873	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 Receivable, Fair Value Disclosure		3,016,576	2,849,213
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		3,016,576	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 Receivable, Fair Value Disclosure		2,830,521	2,333,002
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		2,830,521	2,333,002
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		1,953,217	1,938,505
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		1,953,217	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 Receivable, Fair Value Disclosure		304,434	344,424
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		304,434	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 Receivable, Fair Value Disclosure		576,320	708,209
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		576,320	708,209
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		3,068	4,478
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		3,068	4,478
Carrying (Reported) Amount, Fair Value Disclosure [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		16,329,641	14,737,817
Loans Held-for-sale, Fair Value Disclosure		45,089	13,809
Investments, Fair Value Disclosure		12,626,296	8,740,608
Securities Purchased under Agreements to Resell		850,000	850,000
Interest-bearing Deposits in Banks and Other Financial Institutions		1,747,363	395,850
Cash and due from banks		437,563	491,615
Derivative Assets		89,889	105,674
Deferred Compensation Plan Assets		19,278	16,518
Total Assets		32,145,119	25,351,891
Non-interest bearing		10,497,598	6,890,687
Savings, interest checking and money market		14,604,456	11,621,716
Time Deposits		1,844,691	2,008,012
Federal Funds Purchased, Fair Value Disclosure		42,270	20,035
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure		2,056,113	1,830,737
Other borrowings		0	988
Derivative Liability		18,675	10,219
Deferred Compensation Liability, Current and Noncurrent		19,278	16,518
Financial Liabilities Fair Value Disclosure		29,083,081	22,398,912
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Business [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		6,546,087	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 Receivable, Fair Value Disclosure		1,021,595	899,377
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		3,026,117	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 Receivable, Fair Value Disclosure		2,820,030	2,354,760
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		1,950,502	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 Receivable, Fair Value Disclosure		307,083	349,251
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		655,078	764,977
Carrying (Reported) Amount, Fair Value Disclosure [Member] | Overdrafts [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Loans Receivable, Fair Value Disclosure		$ 3,149	$ 6,304
[1] The fair value of each class of derivative is shown in Note 19.

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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For banks and other depository institutions: Includes cash on hand (currency and coin), cash items in process of collection, noninterest bearing deposits due from other financial institutions (including corporate credit unions), and noninterest bearing balances with the Federal Reserve Banks, Federal Home Loan Banks and central banks.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements. Represents currently earned compensation under compensation arrangements that is not actually paid until a later date.

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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Fair value portion of short term borrowing where a bank borrows, at the federal funds rate, from another bank.

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Fair value of financial obligations, including, but not limited to, debt instruments, derivative liabilities, federal funds purchased and sold under agreements to repurchase, securities loaned or sold under agreements to repurchase, financial instruments sold not yet purchased, guarantees, line of credit, loans and notes payable, servicing liability, and trading liabilities.

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The aggregate of all domestic and foreign interest-bearing deposit liabilities.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables.

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No definition available.

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Fair value portion of loan receivable, including, but not limited to, mortgage loans held for investment, finance receivables held for investment, policy loans on insurance contracts.

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The aggregate amount of all domestic and foreign noninterest-bearing deposits liabilities held by the entity.

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The carrying amount as of the balance sheet date for the aggregate of other miscellaneous borrowings owed by the reporting entity.

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Fair value portion of securities that an entity sells and agrees to repurchase at a specified date for a specified price.

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Amount, after the effects of master netting arrangements, of funds outstanding loaned in the form of a security resale agreement between the entity and another party for the purchase and resale of identical or substantially the same securities at a date certain for a specified price. Includes purchases of participations in pools of securities that are subject to a resale agreement, assets not subject to a master netting arrangement and not elected to be offset.

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Amount of time deposit liabilities, including certificates of deposit.

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