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Fair Value of Assets & Liabilities (Changes In Fair Value Of Assets And Liabilities Which Fair Value Option Included In Current Period Earnings) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Mortgage Banking Noninterest Income | Loans Held-For-Sale |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Changes in fair value included in net income | $ 1,547 | $ 3,380 | $ 2,765
Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total trading liabilities - fixed income | 638,515 | 561,848 |
Total other liabilities | 85,061 | 135,897 |
Recurring | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total trading liabilities - fixed income | 0 | 0 |
Total other liabilities | 9,535 | 33,274 |
Recurring | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total trading liabilities - fixed income | 638,515 | 561,848 |
Total other liabilities | 69,881 | 96,378 |
Recurring | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total trading liabilities - fixed income | 0 | 0 |
Total other liabilities | 5,645 | 6,245 |
Recurring | U.S. treasuries |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total trading liabilities - fixed income | 506,679 | 381,229 |
Recurring | U.S. treasuries | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total trading liabilities - fixed income | 0 | 0 |
Recurring | U.S. treasuries | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total trading liabilities - fixed income | 506,679 | 381,229 |
Recurring | U.S. treasuries | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total trading liabilities - fixed income | 0 | 0 |
Recurring | Corporates and other debt |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total trading liabilities - fixed income | 131,836 | 179,775 |
Recurring | Corporates and other debt | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total trading liabilities - fixed income | 0 | 0 |
Recurring | Corporates and other debt | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total trading liabilities - fixed income | 131,836 | 179,775 |
Recurring | Corporates and other debt | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total trading liabilities - fixed income | 0 | 0 |
Recurring | Derivatives, forwards and futures |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total other liabilities | 9,535 | 33,274 |
Recurring | Derivatives, forwards and futures | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total other liabilities | 9,535 | 33,274 |
Recurring | Derivatives, forwards and futures | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total other liabilities | 0 | 0 |
Recurring | Derivatives, forwards and futures | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total other liabilities | 0 | 0 |
Recurring | Derivatives, interest rate contracts |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total other liabilities | 69,842 | 96,371 |
Recurring | Derivatives, interest rate contracts | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total other liabilities | 0 | 0 |
Recurring | Derivatives, interest rate contracts | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total other liabilities | 69,842 | 96,371 |
Recurring | Derivatives, interest rate contracts | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total other liabilities | 0 | 0 |
Recurring | Derivatives, other |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total other liabilities | 5,684 | 6,252 |
Recurring | Derivatives, other | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total other liabilities | 0 | 0 |
Recurring | Derivatives, other | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total other liabilities | 39 | 7 |
Recurring | Derivatives, other | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Total other liabilities | $ 5,645 | $ 6,245 |

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- Definition For each line item in the statement of financial position, the amounts of gains and losses from fair value changes included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 30 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=75031198&loc=d3e14172-108612 + Details
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