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Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters (Tables) | 3 Months Ended
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Mar. 31, 2025
Commitments and Contingencies Disclosure [Abstract] |
Summary of lending-related and other commitments | The following is a summary of lending-related commitments:
($ in thousands) | Mar 31, 2025 | Dec 31, 2024
Commitments to extend credit(a), excluding commitments to originate residential mortgage loans held for sale(b) | $ | 10,921,983 |  | $ | 11,173,438 |
Commercial letters of credit(a) | 2,869 |  | 875 |
Standby letters of credit(c) | 259,893 |  | 253,709 |
(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 was not material at March 31, 2025 or December 31, 2024. (b) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 9. (c) Standby letters of credit are presented excluding participations. The Corporation has established a liability of $3 million at both March 31, 2025 and December 31, 2024, as an estimate of the fair value of these financial instruments.
Schedule Of Unfunded Commitments [Table Text Block] | The following table presents a summary of the changes in the allowance for unfunded commitments:
($ in thousands) | Three Months Ended Mar 31, 2025 | Year Ended Dec 31, 2024
Allowance for unfunded commitments |  |
Balance at beginning of period | $ | 38,776 |  | $ | 34,776 |
Provision for unfunded commitments | (3,500) |  | 4,000 |
Balance at end of period | $ | 35,276 |  | $ | 38,776 |

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