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Commitments, Off-Balance Sheet Arrangements, and Contingent Liabilities (Tables)
 12 Months Ended
Dec. 31, 2020
Commitments and Contingencies Disclosure [Abstract]  
Summary of lending-related and other commitments The following is a summary of lending-related commitments:
($ in Thousands)20202019
Commitments to extend credit, excluding commitments to originate residential mortgage loans held for sale(a)(b)
$10,010,492 $9,024,412 
Commercial letters of credit(a)
3,642 7,081 
Standby letters of credit(c)
278,798 277,969 
(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, 2020 or 2019.
(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 $3 million at both December 31, 2020 and 2019 as an estimate of the fair value of these financial instruments.
Schedule Of Unfunded Commitments [Table Text Block] The following table presents a summary of the changes in the allowance for unfunded commitments:
($ in Thousands)Year Ended December 31, 2020Year Ended December 31, 2019
Allowance for Unfunded Commitments
Balance at beginning of period$21,907 $24,336 
Cumulative effect of ASU 2016-13 adoption (CECL)18,690 N/A
Balance at beginning of period, adjusted40,597 24,336 
Provision for unfunded commitments7,000 (2,500)
Amount recorded at acquisition179 70 
Balance at end of period$47,776 $21,907