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Derivatives (Derivatives Associated with Fixed Income Trading Activities) (Details) - USD ($) $ in Thousands | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Customer Interest Rate Contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | $ 1,954,439 | $ 1,697,992
Assets | 30,564 | 39,495
Liabilities | 12,256 | 14,996
Offsetting Upstream Interest Rate Contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 1,954,439 | 1,697,992
Assets | 12,119 | 14,996
Liabilities | 28,012 | 39,495
Put Option | Short |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional |  | 5,000
Assets |  | 0
Liabilities |  | 8
Put Option | Long |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 40,000 | 17,500
Assets | 69 | 63
Liabilities | 0 | 0
Forwards And Futures Purchased |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 4,506,883 | 2,916,750
Assets | 3,648 | 6,257
Liabilities | 5,296 | 26,659
Forwards And Futures Sold |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 4,499,160 | 3,085,396
Assets | 6,355 | 27,330
Liabilities | $ 2,331 | $ 6,615

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- Definition Aggregate notional amount specified by the derivative(s). Expressed as an absolute value. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Article 12 -Section 13 -Sentence Column B + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + Details
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