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Derivatives (Gains/(Losses) on Derivatives Associated with Interest Rate Risk Management Activities) (Details) - USD ($) $ in Thousands | 3 Months Ended
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Mar. 31, 2017 | Mar. 31, 2016
Customer Interest Rate Contracts Hedging [Member] | Hedging Instruments And Hedged Items [Member] | Customer Interest Rate Contracts [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains/(Losses) Related to Interest Rate Derivatives | [1] | $ (3,276) | $ 12,559
Customer Interest Rate Contracts Hedging [Member] | Hedging Instruments And Hedged Items [Member] | Offsetting Upstream Interest Rate Contracts [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains/(Losses) Related to Interest Rate Derivatives | [1] | 3,276 | (12,559)
Debt Hedging [Member] | Hedging Instruments [Member] | Interest Rate Swaps [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains/(Losses) Related to Interest Rate Derivatives | [1] | (2,800) | 17,037
Debt Hedging [Member] | Hedged Items [Member] | Term Borrowings [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Gains/(Losses) related to term borrowings | [1],[2] | $ 2,733 | $ (16,745)
[1] | Gains/losses included in the All other expense section of the Consolidated Condensed Statements of Income.
[2] | Represents gains and losses attributable to changes in fair value due to interest rate risk as designated in ASC 815-20 hedging relationships

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