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Commitments and Contingencies (Tables)
 3 Months Ended
Mar. 31, 2021
Commitments and Contingencies Disclosure [Abstract]  
Loan Commitments and Letters of Credit
(in thousands)March 31, 2021December 31, 2020
Letters of credit*$191,359 $190,562 
Commitments to fund commercial and industrial loans8,464,375 8,200,608 
Commitments to fund commercial real estate, construction, and land development loans3,229,163 3,290,041 
Commitments under home equity lines of credit1,643,659 1,602,831 
Unused credit card lines984,268 1,012,313 
Other loan commitments511,084 472,233 
Total letters of credit and unfunded lending commitments$15,023,908 $14,768,588 

LIHTC, solar energy tax credit and other CRA partnerships:
Carrying amount included in other assets$303,676 $262,855 
Amount of future funding commitments included in carrying amount166,390 133,946 
Permanent and short-term construction loans and letter of credit commitments155,060 84,552 
Funded portion of permanent and short-term loans and letters of credit17,404 9,762 
*    Represent the contractual amount net of risk participations purchased of approximately $29.6 million and $30.2 million at March 31, 2021 and December 31, 2020, respectively.