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Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Tables)
 12 Months Ended
Dec. 31, 2021
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, 2021December 31, 2020
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(a)(b)
$10,848,136 $10,010,492 
Commercial letters of credit(a)
5,992 3,642 
Standby letters of credit(c)
248,292 278,798 
(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, 2021 or 2020.
(b) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 14.
(c) The Corporation has established a liability of $2 million and $3 million at December 31, 2021 and 2020, respectively, as an estimate of the fair value of these financial instruments.
Schedule Of Unfunded Commitments [Table Text Block]
The following table presents a summary of the changes in the allowance for unfunded commitments:
($ in Thousands)Year Ended December 31, 2021Year Ended December 31, 2020
Allowance for Unfunded Commitments
Balance at beginning of period$47,776 $21,907 
Cumulative effect of ASU 2016-13 adoption (CECL)N/A18,690 
Balance at beginning of period, adjusted47,776 40,597 
Provision for unfunded commitments(8,000)7,000 
Amount recorded at acquisition— 179 
Balance at end of period$39,776 $47,776