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Derivatives (Derivatives Associated with Fixed Income Trading Activities) (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Customer interest rate contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | $ 2,204,706 | $ 2,026,753
Assets | 9,837 | 22,097
Liabilities | 48,272 | 18,323
Offsetting upstream interest rate contracts |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 2,204,706 | 2,026,753
Assets | 46,619 | 17,931
Liabilities | 9,676 | 20,720
Option contracts purchased | Long |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 70,000 | 20,000
Assets | 58 | 15
Liabilities | 0 | 0
Forwards and futures purchased |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 5,466,761 | 6,257,140
Assets | 16,942 | 4,354
Liabilities | 1,902 | 5,526
Forwards and futures sold |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Notional | 5,556,237 | 6,292,012
Assets | 2,185 | 5,806
Liabilities | $ 16,836 | $ 4,010

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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=77997519&loc=d3e13433-108611 + Details
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