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Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Tables)
 12 Months Ended
Dec. 31, 2024
Commitments and Contingencies Disclosure [Abstract]  
Summary of lending-related and other commitments The following is a summary of lending-related commitments:
($ in thousands)December 31, 2024December 31, 2023
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(a)(b)
$11,173,438 $11,170,147 
Commercial letters of credit(a)
875 3,697 
Standby letters of credit(c)
253,709 212,029 
(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 December 31, 2024 or 2023.
(b) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 13.
(c) Standby letters of credit are presented excluding participations. The Corporation has established a liability of $3 million and $2 million at December 31, 2024 and 2023, respectively, as an estimate of the fair value of these financial instruments.
Schedule Of Unfunded Commitments [Table Text Block]
The following table presents a summary of the changes in the allowance for unfunded commitments:
($ in thousands)Year Ended December 31, 2024Year Ended December 31, 2023
Allowance for unfunded commitments
Balance at beginning of period$34,776 $38,776 
Provision for unfunded commitments4,000 (4,000)
Balance at end of period$38,776 $34,776