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Offsetting Assets and Liabilities Offsetting Assets (Tables) | 6 Months Ended
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Jun. 30, 2015
Offsetting Assets [Line Items] |
Offsetting Assets [Table Text Block] |
| Offsetting of Assets
| Gross Amount of Recognized Assets |  | Gross Amount Offset in the Balance Sheet |  | Net Amount of Assets Presented in the Balance Sheet |  | Gross Amount Not Offset in the Balance Sheet (1) |  | Net Amount
Financial Instruments Received as Collateral |  | Cash Received as Collateral
June 30, 2015: |  |  |  |  |  |  |  |  |  |  |
Derivative assets | $ | 20,804 |  |  | $ | — |  |  | $ | 20,804 |  |  | $ | (2,848 | ) |  | $ | (17,956 | ) |  | $ | — |
December 31, 2014: |  |  |  |  |  |  |  |  |  |  |  |  |
Derivative assets | $ | 5,727 |  |  | $ | — |  |  | $ | 5,727 |  |  | $ | (1,073 | ) |  | $ | (4,521 | ) |  | $ | 133 |

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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 Tabular disclosure of derivative and other financial assets that are subject to offsetting, including master netting arrangements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=34720828&loc=SL20225877-175312 + Details
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