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Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters (Tables)
 9 Months Ended
Sep. 30, 2022
Commitments and Contingencies Disclosure [Abstract]  
Summary of lending-related and other commitments The following is a summary of lending-related commitments:
($ in Thousands)Sep 30, 2022Dec 31, 2021
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(a)(b)
$12,270,556 $10,848,136 
Commercial letters of credit(a)
5,170 5,992 
Standby letters of credit(c)
240,487 230,661 
Schedule Of Unfunded Commitments [Table Text Block] The following table presents a summary of the changes in the allowance for unfunded commitments:
($ in Thousands)Nine Months Ended September 30, 2022Year Ended December 31, 2021
Allowance for Unfunded Commitments
Balance at beginning of period$39,776 $47,776 
Provision for unfunded commitments— (8,000)
Balance at end of period$39,776 $39,776