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Derivatives (Derivatives Associated With Cash Flow Hedges) (Details) - Cash Flow Hedge - USD ($) $ in Thousands | Mar. 31, 2017 | Dec. 31, 2016 | Mar. 31, 2016
--- | --- | --- | ---
Hedging Instruments [Member] | Interest Rate Swap [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Notional | $ 900,000 | $ 250,000 |
Assets | 1,286 |  |
Liabilities |  | 2,045 |
Hedged Items [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Variability in Cash Flows Related to Debt Instruments (Primarily Loans) | 650,000 |  | $ 250,000
Hedged Items [Member] | Interest Rate Contract [Member] |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |
Variability in Cash Flows Related to Debt Instruments (Primarily Loans) | $ 900,000 | $ 250,000 |

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- Definition Fair value of all asset derivatives designated as cash flow hedging instruments. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4B -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=64837297&loc=SL5624163-113959 + Details
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