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Balance Sheet Offsetting (Tables) | 6 Months Ended
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Jun. 30, 2018
Offsetting [Abstract] |
Balance Sheet Offsetting of Derivative Assets and Liabilities | The following table presents the assets and liabilities subject to an enforceable master netting arrangement. The interest and commodity agreements the Corporation has with its commercial customers are not subject to an enforceable master netting arrangement, and therefore, are excluded from this table.
| Gross amounts of recognized assets |  |  |  | Gross amounts not offset in the balance sheet |  |
($ in Thousands) | Gross amounts offset in the balance sheet |  | Net amounts presented in the balance sheet |  | Derivative liability available for offset |  | Collateral received |  | Net amount
Derivative assets: (a) |  |  |  |  |  |  |  |  |  |  |
June 30, 2018 | $ | 68,065 |  |  | $ | — |  |  | $ | 68,065 |  |  | $ | (27,040 | ) |  | $ | (38,601 | ) |  | $ | 2,424 |
December 31, 2017 | 29,503 |  |  | — |  |  | 29,503 |  |  | (16,140 | ) |  | (13,234 | ) |  | 129 |
| Gross amounts of recognized liabilities |  |  |  | Gross amounts not offset in the balance sheet |  |
($ in Thousands) | Gross amounts offset in the balance sheet |  | Net amounts presented in the balance sheet |  | Derivative asset available for offset |  | Collateral pledged |  | Net amount
Derivative liabilities (b) |  |  |  |  |  |  |  |  |  |  |
June 30, 2018 | $ | 63,363 |  |  | $ | — |  |  | $ | 63,363 |  |  | $ | (27,040 | ) |  | $ | (35,513 | ) |  | $ | 810 |
December 31, 2017 | 37,164 |  |  | — |  |  | 37,164 |  |  | (16,140 | ) |  | (20,662 | ) |  | 362 |
(a) Includes interest and commodity instrument assets. (b) Includes interest and commodity instrument liabilities.

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- Definition Financial assets and liabilities offset on the Balance Sheet or subject to master netting agreements. + References No definition available. + Details
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- References No definition available. + Details
Name: | us-gaap_OffsettingAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration