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Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters (Tables)
 6 Months Ended
Jun. 30, 2025
Commitments and Contingencies Disclosure [Abstract]  
Summary of lending-related and other commitments The following is a summary of lending-related commitments:
(in thousands)Jun 30, 2025Dec 31, 2024
Commitments to extend credit(a), excluding commitments to originate residential mortgage loans held for sale(b)
$11,072,466 $11,173,438 
Commercial letters of credit(a)
636 875 
Standby letters of credit(c)
237,979 253,709 
(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 June 30, 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 $2.4 million at June 30, 2025 and $2.5 million at 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)Six Months Ended Jun 30, 2025Year 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