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Derivatives (Derivatives Associated With Interest Rate Risk Management Activities) (Details) - USD ($) $ in Thousands | Jun. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Term borrowings |  | $ 1,033,329 | $ 1,040,656
Customer Interest Rate Contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional |  | 1,903,647 | 1,697,992
Assets |  | 34,224 | 39,495
Liabilities |  | 12,508 | 14,996
Offsetting Upstream Interest Rate Contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional |  | 1,903,647 | 1,697,992
Assets |  | 12,368 | 14,996
Liabilities |  | 31,374 | 39,495
Customer Interest Rate Contracts Hedging | Hedging Instruments And Hedged Items | Customer Interest Rate Contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional |  | 1,513,114 | 1,357,920
Assets |  | 17,056 | 17,566
Liabilities |  | 12,944 | 14,277
Customer Interest Rate Contracts Hedging | Hedging Instruments And Hedged Items | Offsetting Upstream Interest Rate Contracts |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional |  | 1,513,114 | 1,357,920
Assets |  | 11,878 | 14,277
Liabilities |  | 15,630 | 18,066
Debt Hedging | Hedging Instruments | Interest Rate Swap |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional |  | 900,000 | 900,000
Assets |  |  | 1,628
Liabilities |  | 796 | 7,276
Debt Hedging | Hedged Items | Term Borrowings |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Term borrowings | [1] | $ 900,000 | $ 900,000
[1] | Represents par value of term borrowings being hedged.

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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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