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Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters (Tables) | 6 Months Ended
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Jun. 30, 2018
Commitments and Contingencies Disclosure [Abstract] |
Summary of lending-related and other commitments | The following is a summary of lending-related commitments.
| June 30, 2018 | December 31, 2017
| ($ in Thousands)
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(a)(b) | $ | 8,552,601 |  | $ | 8,027,187 |
Commercial letters of credit(a) | 13,167 |  | 11,886 |
Standby letters of credit(c) | 255,858 |  | 235,361 |
(a) | These off-balance sheet financial instruments are exercisable at the market rate prevailing at the date the underlying transaction will be completed and, thus, are deemed to have no current fair value, or the fair value is based on fees currently charged to enter into similar agreements and is not material at June 30, 2018 or December 31, 2017.
(b) | Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 10.
(c) The Corporation has established a liability of $3 million at June 30, 2018 and $2 million at December 31, 2017, as an estimate of the fair value of these financial instruments.
Summary of changes in the residential mortgage repurchase reserve | The following summarizes the changes in the mortgage repurchase reserve.
| Six Months Ended June 30, 2018 |  | Year Ended December 31, 2017
| ($ in Thousands)
Balance at beginning of period | $ | 987 |  |  | $ | 900 |
Repurchase provision expense | 150 |  |  | 246 |
Charge offs, net | (90 | ) |  | (159 | )
Amount recorded at acquisition | 88 |  |  | — |
Balance at end of period | $ | 1,135 |  |  | $ | 987 |

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