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Derivative and Hedging Activities (Tables) | 6 Months Ended
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Jun. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract] |
Summary Of Other derivative instruments not designated as hedging instruments | The table below identifies the balance sheet category and fair values of the Corporation’s derivative instruments.
| June 30, 2018 |  | December 31, 2017
($ in Thousands) | Notional Amount |  | Fair Value |  | Balance Sheet Category |  | Notional Amount |  | Fair Value |  | Balance Sheet Category
Derivatives not designated as hedging instruments |  |  |  |  |  |  |  |  |  |  |
Interest rate-related instruments — customer and mirror | $ | 2,668,542 |  |  | $ | 62,708 |  |  | Trading assets |  | $ | 2,183,687 |  |  | $ | 28,494 |  |  | Trading assets
Interest rate-related instruments — customer and mirror | 2,668,542 |  |  | (62,141 | ) |  | Trading liabilities |  | 2,183,687 |  |  | (28,035 | ) |  | Trading liabilities
Foreign currency exchange forwards | 143,551 |  |  | 3,317 |  |  | Trading assets |  | 124,851 |  |  | 2,495 |  |  | Trading assets
Foreign currency exchange forwards | 136,177 |  |  | (3,091 | ) |  | Trading liabilities |  | 118,094 |  |  | (2,339 | ) |  | Trading liabilities
Commodity contracts | 419,459 |  |  | 66,894 |  |  | Trading assets |  | 457,868 |  |  | 38,686 |  |  | Trading assets
Commodity contracts | 419,458 |  |  | (66,380 | ) |  | Trading liabilities |  | 457,108 |  |  | (37,286 | ) |  | Trading liabilities
Interest rate lock commitments (mortgage) | 335,070 |  |  | 3,287 |  |  | Other assets |  | 222,736 |  |  | 1,538 |  |  | Other assets
Forward commitments (mortgage) | 312,003 |  |  | (919 | ) |  | Other liabilities |  | 164,567 |  |  | (313 | ) |  | Other liabilities
Purchased options (time deposit) | 25,511 |  |  | 1,027 |  |  | Other assets |  | 31,063 |  |  | 1,175 |  |  | Other assets
Written options (time deposit) | 25,511 |  |  | (1,027 | ) |  | Other liabilities |  | 31,063 |  |  | (1,175 | ) |  | Other liabilities
Derivatives designated as hedging instruments |  |  |  |  |  |  |  |  |  |  |
Interest Rate Products | 500,000 |  |  | 2,396 |  |  | Other assets |  | — |  |  | — |  |  | Other assets
Cumulative Basis Adjustment for Fair Value Hedges | The following table presents amounts that were recorded on the balance sheet related to cumulative basis adjustment for fair value hedges.
| Line Item in the Statement of Financial Position in Which the Hedged Item is Included
| Carrying Amount of the Hedged Assets/(Liabilities) |  | Cumulative Amount of Fair Value Hedging Adjustment Included in the Carrying Amount of the Hedged Assets/(Liabilities)
($ in Thousands) | June 30, 2018
Loans and investment securities receivables (a) | 497,591 |  |  | (2,409 | )
Total | $ | 497,591 |  |  | $ | (2,409 | )
(a) These amounts include the amortized cost basis of closed portfolios used to designated hedging relationships in which the hedged item is the last layer expected to be remaining at the end of the hedging relationship. At June 30, 2018, the amortized cost basis of the closed portfolios used in these hedging relationships was $1.2 billion; the negative cumulative basis adjustments associated with these hedging relationships was $2.4 million; and the amounts of the designated hedged items were $500 million.
Schedule of Cash Flow Hedging Instruments, Statements of Financial Performance and Financial Position, Location [Table Text Block] | The table below identifies the effect of fair value hedge accounting on the Corporation's statement of performance during the six months ended June 30, 2018.
| Location and Amount of Gain or (Loss) Recognized in Income on Fair Value and Cash Flow Hedging Relationships
| Six Months Ended June 30, 2018 | Year Ended December 31, 2017
($ in Thousands) | Interest Income | Other Income (Expense) | Interest Income | Other Income (Expense)
Total amounts of income and expense line items presented in the statement of financial performance in which the effects of fair value or cash flow hedges are recorded | (13 | ) | — |  | — |  | — |
The effects of fair value and cash flow hedging: Gain or (loss) on fair value hedging relationships in Subtopic 815-20 |  |  |  |
Interest contracts |  |  |  |
Hedged items | (2,409 | ) | — |  | — |  | — |
Derivatives designated as hedging instruments | 2,396 |  | — |  | — |  | — |
Gain (loss) on derivative instruments not designated as hedging instruments | The table below identifies the effect of derivatives not designated as hedging instruments on the Corporation's statement of performance during the six months ended June 30, 2018.
| Income Statement Category of Gain / (Loss) Recognized in Income | For the Six Months Ended June 30,
($ in Thousands) |  | 2018 |  | 2017
Derivative Instruments |  |  |  |
Interest rate-related instruments — customer and mirror, net | Capital markets, net | $ | 108 |  |  | $ | (69 | )
Interest rate lock commitments (mortgage) | Mortgage banking, net | 1,749 |  |  | 2,474 |
Forward commitments (mortgage) | Mortgage banking, net | (606 | ) |  | (2,749 | )
Foreign currency exchange forwards | Capital markets, net | 70 |  |  | 9 |
Commodity contracts | Capital markets, net | (886 | ) |  | 198 |

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- Definition Summary Of Other Derivative Instruments Not Designated As Hedging Instruments [Table Text Block] [Table Text Block] + References No definition available. + Details
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- Definition Tabular disclosure for cash flow hedging instruments of (a) the location and amount of gains and losses reported in the statement of financial performance and (b) the location and fair value amounts of the instruments reported in the statement of financial position. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4C -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5624171-113959 + Details
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