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Derivatives (Derivatives Associated With Interest Rate Risk Management Activities) (Details) - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Term borrowings |  | $ 1,035,036 | $ 1,040,656
Customer Interest Rate Contracts [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional |  | 1,743,855 | 1,697,992
Assets |  | 34,060 | 39,495
Liabilities |  | 15,510 | 14,996
Offsetting Upstream Interest Rate Contracts [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional |  | 1,743,855 | 1,697,992
Assets |  | 15,258 | 14,996
Liabilities |  | 31,677 | 39,495
Customer Interest Rate Contracts Hedging [Member] | Hedging Instruments And Hedged Items [Member] | Customer Interest Rate Contracts [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional |  | 1,450,711 | 1,357,920
Assets |  | 15,401 | 17,566
Liabilities |  | 15,388 | 14,277
Customer Interest Rate Contracts Hedging [Member] | Hedging Instruments And Hedged Items [Member] | Offsetting Upstream Interest Rate Contracts [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional |  | 1,450,711 | 1,357,920
Assets |  | 14,053 | 14,277
Liabilities |  | 14,277 | 18,066
Debt Hedging [Member] | Hedging Instruments [Member] | Interest Rate Swap [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional |  | 900,000 | 900,000
Assets |  | 749 | 1,628
Liabilities |  |  | 7,276
Debt Hedging [Member] | Hedged Items [Member] | Term Borrowings [Member] |  |  |
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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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Fair value as of the balance sheet date of interest rate derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611 + Details
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