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Commitments and Contingencies (Tables)
 9 Months Ended
Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]  
Loan Commitments and Letters of Credit
(in thousands)September 30, 2021December 31, 2020
Letters of credit(1)
$184,317 $190,562 
Commitments to fund commercial and industrial loans8,893,056 8,200,608 
Commitments to fund commercial real estate, construction, and land development loans3,490,875 3,290,041 
Commitments under home equity lines of credit1,738,063 1,602,831 
Unused credit card lines1,008,471 1,012,313 
Other loan commitments580,936 472,233 
Total letters of credit and unfunded lending commitments$15,895,718 $14,768,588 
LIHTC, solar energy tax credit, new market tax credit, and other CRA partnerships:
Carrying amount included in other assets$380,624 $262,855 
Amount of future funding commitments included in carrying amount213,791 133,946 
Permanent and short-term construction loans and letter of credit commitments(2)
172,285 82,786 
Funded portion of permanent and short-term loans and letters of credit(3)
69,823 9,528 
(1)    Represent the contractual amount net of risk participations purchased of $26.4 million and $30.2 million at September 30, 2021 and December 31, 2020, respectively.
(2)    Represent the contractual amount net of risk participations of $3.6 million and $1.8 million at September 30, 2021 and December 31, 2020.
(3)    Represent the contractual amount net of risk participations of $2.4 million and $234 thousand at September 30, 2021 December 31, 2020.