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Fair Value Of Assets And Liabilities (Schedule Of Assets And Liabilities Measured At Fair Value On A Recurring Basis) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
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Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | $ 1,167,310 |  | $ 897,071 |
Loans held-for-sale | 22,445 |  | 24,269 |
Securities available for sale, Fair Value | 3,939,278 | [1] | 3,943,499 | [2]
Total other assets | 132,229 |  | 155,479 |
Total assets | 5,099,538 |  | 4,858,813 |
Total other liabilities | 101,347 |  | 135,897 |
Total liabilities | 949,537 |  | 697,745 |
Recurring |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Securities available for sale, Fair Value | 3,777,554 |  | 3,781,994 |
Level 1 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Loans held-for-sale | 0 |  | 0 |
Securities available for sale, Fair Value | 25,221 |  | 25,249 |
Total other assets | 51,336 |  | 66,427 |
Total assets | 76,557 |  | 91,676 |
Total other liabilities | 18,365 |  | 33,274 |
Total liabilities | 18,365 |  | 33,274 |
Level 2 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Loans held-for-sale | 1,224 |  | 2,345 |
Securities available for sale, Fair Value | 3,752,333 |  | 3,756,745 |
Total other assets | 80,893 |  | 88,067 |
Total assets | 4,999,425 |  | 4,741,655 |
Total other liabilities | 77,032 |  | 96,378 |
Total liabilities | 925,222 |  | 658,226 |
Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Loans held-for-sale | 21,221 |  | 21,924 |
Securities available for sale, Fair Value | 0 |  | 0 |
Total other assets | 0 |  | 985 |
Total assets | 23,556 |  | 25,482 |
Total other liabilities | 5,950 |  | 6,245 |
Total liabilities | 5,950 |  | 6,245 |
Deferred Compensation Assets |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total other assets | 34,109 |  | 32,840 |
Deferred Compensation Assets | Level 1 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total other assets | 34,109 |  | 32,840 |
Deferred Compensation Assets | Level 2 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total other assets | 0 |  | 0 |
Deferred Compensation Assets | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total other assets | 0 |  | 0 |
Mortgage Servicing Rights, Net [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total other assets |  |  | 985 |
Mortgage Servicing Rights, Net [Member] | Level 1 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total other assets |  |  | 0 |
Mortgage Servicing Rights, Net [Member] | Level 2 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total other assets |  |  | 0 |
Mortgage Servicing Rights, Net [Member] | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total other assets |  |  | 985 |
Derivatives, Forwards And Futures |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total other assets | 17,227 |  | 33,587 |
Total other liabilities | 18,365 |  | 33,274 |
Derivatives, Forwards And Futures | Level 1 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total other assets | 17,227 |  | 33,587 |
Total other liabilities | 18,365 |  | 33,274 |
Derivatives, Forwards And Futures | Level 2 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total other assets | 0 |  | 0 |
Total other liabilities | 0 |  | 0 |
Derivatives, Forwards And Futures | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total other assets | 0 |  | 0 |
Total other liabilities | 0 |  | 0 |
Derivatives, Interest Rate Contracts |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total other assets | 80,893 |  | 88,025 |
Total other liabilities | 76,986 |  | 96,371 |
Derivatives, Interest Rate Contracts | Level 1 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total other assets | 0 |  | 0 |
Total other liabilities | 0 |  | 0 |
Derivatives, Interest Rate Contracts | Level 2 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total other assets | 80,893 |  | 88,025 |
Total other liabilities | 76,986 |  | 96,371 |
Derivatives, Interest Rate Contracts | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total other assets | 0 |  | 0 |
Total other liabilities | 0 |  | 0 |
Derivatives, Other |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total other assets |  |  | 42 |
Total other liabilities | 5,996 |  | 6,252 |
Derivatives, Other | Level 1 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total other assets |  |  | 0 |
Total other liabilities | 0 |  | 0 |
Derivatives, Other | Level 2 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total other assets |  |  | 42 |
Total other liabilities | 46 |  | 7 |
Derivatives, Other | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Total other assets |  |  | 0 |
Total other liabilities | 5,950 |  | 6,245 |
U.S. treasuries |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Securities available for sale, Fair Value | 100 |  | 100 |
U.S. treasuries | Level 1 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Securities available for sale, Fair Value | 0 |  | 0 |
U.S. treasuries | Level 2 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Securities available for sale, Fair Value | 100 |  | 100 |
U.S. treasuries | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Securities available for sale, Fair Value | 0 |  | 0 |
Government Agency Issued Mortgage-Backed Securities ("MBS") |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Securities available for sale, Fair Value | 2,159,922 |  | 2,208,687 |
Government Agency Issued Mortgage-Backed Securities ("MBS") | Level 1 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Securities available for sale, Fair Value | 0 |  | 0 |
Government Agency Issued Mortgage-Backed Securities ("MBS") | Level 2 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Securities available for sale, Fair Value | 2,159,922 |  | 2,208,687 |
Government Agency Issued Mortgage-Backed Securities ("MBS") | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Securities available for sale, Fair Value | 0 |  | 0 |
Government Agency Issued Collateralized Mortgage Obligations ("CMO") |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Securities available for sale, Fair Value | 1,592,311 |  | 1,547,958 |
Government Agency Issued Collateralized Mortgage Obligations ("CMO") | Level 1 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Securities available for sale, Fair Value | 0 |  | 0 |
Government Agency Issued Collateralized Mortgage Obligations ("CMO") | Level 2 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Securities available for sale, Fair Value | 1,592,311 |  | 1,547,958 |
Government Agency Issued Collateralized Mortgage Obligations ("CMO") | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Securities available for sale, Fair Value | 0 |  | 0 |
Equity, Mutual Funds, And Other |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Securities available for sale, Fair Value | 25,221 |  | 25,249 |
Equity, Mutual Funds, And Other | Level 1 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Securities available for sale, Fair Value | 25,221 |  | 25,249 |
Equity, Mutual Funds, And Other | Level 2 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Securities available for sale, Fair Value | 0 |  | 0 |
Equity, Mutual Funds, And Other | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Securities available for sale, Fair Value | 0 |  | 0 |
Fixed Income |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 1,164,980 |  | 894,503 |
Total trading liabilities - fixed income | 848,190 |  | 561,848 |
Fixed Income | Level 1 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 0 |  | 0 |
Total trading liabilities - fixed income | 0 |  | 0 |
Fixed Income | Level 2 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 1,164,975 |  | 894,498 |
Total trading liabilities - fixed income | 848,190 |  | 561,848 |
Fixed Income | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 5 |  | 5 |
Total trading liabilities - fixed income | 0 |  | 0 |
Fixed Income | U.S. treasuries |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 107,264 |  | 146,988 |
Total trading liabilities - fixed income | 657,059 |  | 381,229 |
Fixed Income | U.S. treasuries | Level 1 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 0 |  | 0 |
Total trading liabilities - fixed income | 0 |  | 0 |
Fixed Income | U.S. treasuries | Level 2 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 107,264 |  | 146,988 |
Total trading liabilities - fixed income | 657,059 |  | 381,229 |
Fixed Income | U.S. treasuries | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 0 |  | 0 |
Total trading liabilities - fixed income | 0 |  | 0 |
Fixed Income | Government Agency Issued Mortgage-Backed Securities ("MBS") |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 323,058 |  | 256,611 |
Fixed Income | Government Agency Issued Mortgage-Backed Securities ("MBS") | Level 1 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 0 |  | 0 |
Fixed Income | Government Agency Issued Mortgage-Backed Securities ("MBS") | Level 2 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 323,058 |  | 256,611 |
Fixed Income | Government Agency Issued Mortgage-Backed Securities ("MBS") | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 0 |  | 0 |
Fixed Income | Government Agency Issued Collateralized Mortgage Obligations ("CMO") |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 213,949 |  | 150,058 |
Fixed Income | Government Agency Issued Collateralized Mortgage Obligations ("CMO") | Level 1 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 0 |  | 0 |
Fixed Income | Government Agency Issued Collateralized Mortgage Obligations ("CMO") | Level 2 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 213,949 |  | 150,058 |
Fixed Income | Government Agency Issued Collateralized Mortgage Obligations ("CMO") | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 0 |  | 0 |
Fixed Income | Other U.S. Government Agencies |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 88,613 |  | 52,314 |
Total trading liabilities - fixed income |  |  | 844 |
Fixed Income | Other U.S. Government Agencies | Level 1 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 0 |  | 0 |
Total trading liabilities - fixed income |  |  | 0 |
Fixed Income | Other U.S. Government Agencies | Level 2 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 88,613 |  | 52,314 |
Total trading liabilities - fixed income |  |  | 844 |
Fixed Income | Other U.S. Government Agencies | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 0 |  | 0 |
Total trading liabilities - fixed income |  |  | 0 |
Fixed Income | States And Municipalities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 83,872 |  | 60,351 |
Total trading liabilities - fixed income | 11,048 |  |  |
Fixed Income | States And Municipalities | Level 1 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 0 |  | 0 |
Total trading liabilities - fixed income | 0 |  |  |
Fixed Income | States And Municipalities | Level 2 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 83,872 |  | 60,351 |
Total trading liabilities - fixed income | 11,048 |  |  |
Fixed Income | States And Municipalities | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 0 |  | 0 |
Total trading liabilities - fixed income | 0 |  |  |
Fixed Income | Corporate And Other Debt |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 346,748 |  | 227,939 |
Total trading liabilities - fixed income | 180,083 |  | 179,775 |
Fixed Income | Corporate And Other Debt | Level 1 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 0 |  | 0 |
Total trading liabilities - fixed income | 0 |  | 0 |
Fixed Income | Corporate And Other Debt | Level 2 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 346,743 |  | 227,934 |
Total trading liabilities - fixed income | 180,083 |  | 179,775 |
Fixed Income | Corporate And Other Debt | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 5 |  | 5 |
Total trading liabilities - fixed income | 0 |  | 0 |
Fixed Income | Equity, Mutual Funds, And Other |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 1,476 |  | 242 |
Fixed Income | Equity, Mutual Funds, And Other | Level 1 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 0 |  | 0 |
Fixed Income | Equity, Mutual Funds, And Other | Level 2 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 1,476 |  | 242 |
Fixed Income | Equity, Mutual Funds, And Other | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 0 |  | 0 |
Mortgage Banking |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 2,330 |  | 2,568 |
Mortgage Banking | Level 1 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 0 |  | 0 |
Mortgage Banking | Level 2 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | 0 |  | 0 |
Mortgage Banking | Level 3 |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items] |  |  |  |
Trading securities | $ 2,330 |  | $ 2,568 |
[1] | Includes $ 3 . 5 billion of securities pledged to secure public deposits, securities sold under agreements to repurchase, and for other purposes.
[2] | Includes $ 3.3 billion of securities pledged to secure public deposits, securities sold under agreements to repu rchase, and for other purposes .

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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. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=65884222&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=73527792&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=66010992&loc=d3e26610-111562 + Details
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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Fair value portion of liabilities pertaining to principal and customer trading transactions, or which may be incurred with the objective of generating a profit from short-term fluctuations in price as part of an entity's market-making, hedging and proprietary trading. Examples include, but are not limited to, short positions in securities, derivatives and commodities. + References No definition available. + Details
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