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Derivatives (Narrative) (Details) Boe in Thousands, $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 USD ($) Boe warrant | Mar. 31, 2017 USD ($) | Dec. 31, 2017 USD ($) warrant
Derivative [Line Items] |  |  |
Derivative liabilities | $ 86,673 |  | $ 74,935
Derivative assets | 59,831 |  | 66,146
Derivative asset, reduction in fair value | 38,877 |  | 29,205
Derivative liability, reduction in fair value | 25,538 |  | 48,203
Collateral posted | 12,038 |  | 28,796
Derivatives designated as hedging instruments |  |  |
Derivative [Line Items] |  |  |
Notional amount | 133,275 |  | 35,811
Derivative liabilities | 9,405 |  | 6,799
Derivative assets | 0 |  | 0
Derivatives not designated as hedging instruments |  |  |
Derivative [Line Items] |  |  |
Notional amount | 11,133,117 |  | 10,153,108
Derivative liabilities | 77,268 |  | 68,136
Derivative assets | 59,831 |  | 66,146
Interest rate swaps | Derivatives designated as hedging instruments |  |  |
Derivative [Line Items] |  |  |
Notional amount | 35,811 |  | 35,811
Derivative liabilities | 8,251 |  | 6,799
Derivative assets | 0 |  | 0
Interest rate swaps | Derivatives designated as hedging instruments | Fair Value Hedges |  |  |
Derivative [Line Items] |  |  |
Notional amount | 35,800 |  | 35,800
Derivative liabilities | 8,300 |  | 6,800
Foreign exchange forwards | Derivatives designated as hedging instruments |  |  |
Derivative [Line Items] |  |  |
Notional amount | 97,464 |  | 0
Derivative liabilities | 1,154 |  | 0
Derivative assets | 0 |  | 0
Foreign exchange forwards | Derivatives designated as hedging instruments | Net investment hedges |  |  |
Derivative [Line Items] |  |  |
Notional amount | 97,500 |  |
Derivative liabilities | 1,200 |  |
Total fair value change in Foreign Currency Translation Adjustment with AOCI | (1,200) |  |
Loss recognized in AOCI on net investment hedges (effective portion) |  | $ 648 |
(Losses) gains recognized in foreign exchange income (ineffective portion) |  | $ (2,000) |
Interest rate swaps and options |  |  |
Derivative [Line Items] |  |  |
Notional amount of derivative assets | 5,110,000 |  | 4,690,000
Notional amount of derivative liabilities | 5,050,000 |  | 4,650,000
Interest rate swaps and options | Derivatives not designated as hedging instruments |  |  |
Derivative [Line Items] |  |  |
Notional amount | 10,155,401 |  | 9,333,860
Derivative liabilities | 72,893 |  | 57,958
Derivative assets | 51,933 |  | 58,633
Interest rate swaps and options | Derivatives not designated as hedging instruments | LCH |  |  |
Derivative [Line Items] |  |  |
Notional amount of derivative assets | 1,400,000 |  |
Fair value of interest rate swaps cleared through LCH | 0 |  |
Derivative asset, reduction in fair value | (25,700) |  |
Derivative liability, reduction in fair value | (3,000) |  |
Foreign exchange spot and forwards | Derivatives not designated as hedging instruments |  |  |
Derivative [Line Items] |  |  |
Notional amount | 895,788 |  | 770,215
Derivative liabilities | 4,066 |  | 10,170
Derivative assets | 6,087 |  | 5,840
Credit risk participation agreements | Derivatives not designated as hedging instruments |  |  |
Derivative [Line Items] |  |  |
Notional amount | 81,928 |  | 49,033
Derivative liabilities | 21 |  | 8
Derivative assets | $ 1 |  | $ 1
Weighted average remaining maturity (in years) | 6 years 8 months 12 days |  | 6 years
Credit risk participation agreements | Derivatives not designated as hedging instruments | Long |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 68,900 |  | $ 35,200
Derivative liabilities | 21 |  | 8
Interest rate derivative exposure | 756 |  | 419
Credit risk participation agreements | Derivatives not designated as hedging instruments | Short |  |  |
Derivative [Line Items] |  |  |
Notional amount | 13,000 |  | 13,800
Derivative assets | 1 |  | 1
Equity warrants | Derivatives not designated as hedging instruments |  |  |
Derivative [Line Items] |  |  |
Notional amount | 0 |  | 0
Derivative liabilities | 0 |  | 0
Derivative assets | 1,513 |  | 1,672
Warrant, Public Companies | Derivatives not designated as hedging instruments |  |  |
Derivative [Line Items] |  |  |
Derivative assets | $ 582 |  | $ 993
Number of warrants held | warrant | 4 |  | 4
Warrant, Private Companies | Derivatives not designated as hedging instruments |  |  |
Derivative [Line Items] |  |  |
Derivative assets | $ 931 |  | $ 679
Number of warrants held | warrant | 24 |  | 23
Commodity options | Derivatives not designated as hedging instruments |  |  |
Derivative [Line Items] |  |  |
Notional amount | $ 0 |  | $ 0
Derivative liabilities | 288 |  | 0
Derivative assets | $ 297 |  | 0
Commodity options | Derivatives not designated as hedging instruments | Customers |  |  |
Derivative [Line Items] |  |  |
Notional amount of commodity contracts in number of barrels of oil | Boe | 216 |  |
Commodity options | Derivatives not designated as hedging instruments | Chicago Mercantile Exchange (CME) |  |  |
Derivative [Line Items] |  |  |
Derivative asset, reduction in fair value | $ (276) |  |
Derivative liability, reduction in fair value | $ (297) |  |
Notional amount of commodity contracts in number of barrels of oil | Boe | 216 |  |
Credit-risk-related contingent features |  |  |
Derivative [Line Items] |  |  |
Aggregate fair value of derivative instruments in net liability position | $ 14,900 |  | 6,300
Collateral posted | 12,300 |  | $ 6,200
Additional collateral required to be posted if credit rating is downgraded | $ 3,500 |  |

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