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

3 Months Ended

Mar. 31, 2022

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, 2022		Dec 31, 2021
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(a)(b)	$	10,973,357	$	10,848,136
Commercial letters of credit(a)	9,827		5,992
Standby letters of credit(c)	257,039		248,292

(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 March 31, 2022 or December 31, 2021.
(b) Interest rate lock commitments to originate residential mortgage loans held for sale are considered derivative instruments and are disclosed in Note 10.
(c) The Corporation has established a liability of $2 million for both March 31, 2022 and December 31, 2021, 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)	Three months ended Mar 31, 2022		Year Ended Dec 31, 2021
Allowance for Unfunded Commitments
Balance at beginning of period	$	39,776	$	47,776
Provision for unfunded commitments	(1,000)		(8,000)
Balance at end of period	$	38,776	$	39,776