Commitments, Off-Balance Sheet Arrangements, Legal Proceedings and Regulatory Matters (Tables)

3 Months Ended

Mar. 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)	Mar 31, 2023		Dec 31, 2022
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(a)(b)	$	11,919,626	$	12,444,275
Commercial letters of credit(a)	5,413		3,188
Standby letters of credit(c)	251,565		270,692

Schedule Of Unfunded Commitments [Table Text Block]

The following table presents a summary of the changes in the allowance for unfunded commitments:

($ in thousands)	Three Months Ended March 31, 2023		Year Ended December 31, 2022
Allowance for unfunded commitments
Balance at beginning of period	$	38,776	$	39,776
Provision for unfunded commitments	1,000		(1,000)
Balance at end of period	$	39,776	$	38,776