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Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Tables)
 12 Months Ended
Dec. 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)December 31, 2025December 31, 2024
Commitments to extend credit(a), excluding commitments to originate residential mortgage loans held for sale(b)
$11,872,816 $11,173,438 
Commercial letters of credit(a)
425 875 
Standby letters of credit(c)
222,047 253,709 
(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 December 31, 2025 or 2024.
(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 $2.2 million at December 31, 2025 and 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)Year Ended December 31, 2025Year Ended December 31, 2024
Allowance for unfunded commitments
Balance at beginning of period$38,776 $34,776 
Provision for unfunded commitments2,500 4,000 
Balance at end of period$41,276 $38,776