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Derivatives (Notional and Fair Values) (Details) Boe in Thousands, $ in Thousands | 3 Months Ended |
--- | --- | ---
Mar. 31, 2018 USD ($) Boe warrant | Dec. 31, 2017 USD ($) warrant
Fair Values of Derivative Instruments |  |
Derivative Assets | $ 59,831 | $ 66,146
Derivative Liabilities | 86,673 | 74,935
Derivatives designated as hedging instruments |  |
Fair Values of Derivative Instruments |  |
Notional Amount | 133,275 | 35,811
Derivative Assets | 0 | 0
Derivative Liabilities | 9,405 | 6,799
Derivatives designated as hedging instruments | Interest rate swaps |  |
Fair Values of Derivative Instruments |  |
Notional Amount | 35,811 | 35,811
Derivative Assets | 0 | 0
Derivative Liabilities | 8,251 | 6,799
Derivatives designated as hedging instruments | Foreign exchange forwards |  |
Fair Values of Derivative Instruments |  |
Notional Amount | 97,464 | 0
Derivative Assets | 0 | 0
Derivative Liabilities | 1,154 | 0
Derivatives not designated as hedging instruments |  |
Fair Values of Derivative Instruments |  |
Notional Amount | 11,133,117 | 10,153,108
Derivative Assets | 59,831 | 66,146
Derivative Liabilities | 77,268 | 68,136
Derivatives not designated as hedging instruments | Interest rate swaps and options |  |
Fair Values of Derivative Instruments |  |
Notional Amount | 10,155,401 | 9,333,860
Derivative Assets | 51,933 | 58,633
Derivative Liabilities | 72,893 | 57,958
Derivatives not designated as hedging instruments | Foreign exchange spot and forwards |  |
Fair Values of Derivative Instruments |  |
Notional Amount | 895,788 | 770,215
Derivative Assets | 6,087 | 5,840
Derivative Liabilities | 4,066 | 10,170
Derivatives not designated as hedging instruments | Credit risk participation agreements |  |
Fair Values of Derivative Instruments |  |
Notional Amount | 81,928 | 49,033
Derivative Assets | 1 | 1
Derivative Liabilities | 21 | 8
Derivatives not designated as hedging instruments | Equity warrants |  |
Fair Values of Derivative Instruments |  |
Notional Amount | 0 | 0
Derivative Assets | 1,513 | 1,672
Derivative Liabilities | 0 | 0
Derivatives not designated as hedging instruments | Warrant, Public Companies |  |
Fair Values of Derivative Instruments |  |
Derivative Assets | $ 582 | $ 993
Number of warrants held | warrant | 4 | 4
Derivatives not designated as hedging instruments | Warrant, Private Companies |  |
Fair Values of Derivative Instruments |  |
Derivative Assets | $ 931 | $ 679
Number of warrants held | warrant | 24 | 23
Derivatives not designated as hedging instruments | Commodity options |  |
Fair Values of Derivative Instruments |  |
Notional Amount | $ 0 | $ 0
Derivative Assets | 297 | 0
Derivative Liabilities | $ 288 | $ 0
Derivatives not designated as hedging instruments | Commodity options | Customers |  |
Fair Values of Derivative Instruments |  |
Notional amount of commodity contracts in number of barrels of oil | Boe | 216 |
Derivatives not designated as hedging instruments | Commodity options | Chicago Mercantile Exchange (CME) |  |
Fair Values of Derivative Instruments |  |
Notional amount of commodity contracts in number of barrels of oil | Boe | 216 |

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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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