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Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Tables)
 12 Months Ended
Dec. 31, 2023
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, 2023December 31, 2022
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(a)(b)
$11,170,147 $12,444,275 
Commercial letters of credit(a)
3,697 3,188 
Standby letters of credit(c)
212,029 270,692 
(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, 2023 or 2022.
(b) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 14.
(c) Standby letters of credit are presented excluding participations. The Corporation has established a liability of $2 million and $3 million at December 31, 2023 and 2022, respectively, as an estimate of the fair value of these financial instruments.
Schedule Of Unfunded Commitments [Table Text Block]
The following table presents a summary of the changes in the allowance for unfunded commitments:
($ in thousands)Year Ended December 31, 2023Year Ended December 31, 2022
Allowance for unfunded commitments
Balance at beginning of period$38,776 $39,776 
Provision for unfunded commitments(4,000)(1,000)
Balance at end of period$34,776 $38,776