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Balance Sheet Offsetting | 6 Months Ended
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Jun. 30, 2018
Offsetting [Abstract] |
Balance Sheet Offsetting | Balance Sheet Offsetting Interest Rate-Related Instruments and Commodity Contracts (“Interest and Commodity Agreements”) The Corporation enters into interest rate-related instruments to facilitate the interest rate risk management strategies of commercial customers. The Corporation also enters into commodity contracts to manage commercial customers' exposure to fluctuating commodity prices. The Corporation mitigates these risks by entering into equal and offsetting interest and commodity agreements with highly rated third party financial institutions. The Corporation is party to master netting arrangements with its financial institution counterparties that creates a single net settlement of all legal claims or obligations to pay or receive the net amount of settlement of the individual interest and commodity agreements. Collateral, usually in the form of investment securities and cash, is posted by the counterparty with net liability positions in accordance with contract thresholds. The Corporation does not offset assets and liabilities under these arrangements for financial statement presentation purposes. See Note 10 for additional information on the Corporation’s derivative and hedging activities. Securities Sold Under Agreements to Repurchase (“Repurchase Agreements”) The Corporation enters into agreements under which it sells securities subject to an obligation to repurchase the same or similar securities. These repurchase agreements are accounted for as collateralized financing arrangements (i.e., secured borrowings) and not as a sale and subsequent repurchase of securities (i.e., there is no offsetting or netting of the investment securities assets with the repurchase agreement liabilities). The right of set-off for a repurchase agreement resembles a secured borrowing, whereby the collateral would be used to settle the fair value of the repurchase agreement should the Corporation be in default (e.g., fails to make an interest payment to the counterparty). In addition, the Corporation does not enter into reverse repurchase agreements; therefore, there is no such offsetting to be done with the repurchase agreements. See Note 9 for additional disclosures on repurchase agreements. 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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