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Derivatives (Gains/(Losses) on Derivatives Associated with Interest Rate Risk Management Activities) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
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Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Customer Interest Rate Contracts Hedging | Hedging Instruments And Hedged Items | Customer Interest Rate Contracts |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gains/(Losses) Related to Interest Rate Derivatives | [1] | $ 4,099 | $ 8,154 | $ 823 | $ 20,713
Customer Interest Rate Contracts Hedging | Hedging Instruments And Hedged Items | Offsetting Upstream Interest Rate Contracts |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gains/(Losses) Related to Interest Rate Derivatives | [1] | (4,099) | (8,154) | (823) | (20,713)
Debt Hedging | Hedging Instruments | Interest Rate Swap |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gains/(Losses) Related to Interest Rate Derivatives | [1] | 1,808 | 6,660 | (992) | 26,606
Debt Hedging | Hedged Items | Term Borrowings |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |
Gains/(Losses) related to term borrowings | [1],[2] | $ (1,804) | $ (6,557) | $ 929 | $ (26,211)
[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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