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Commitments and Contingencies (Tables)
12 Months Ended
Dec. 31, 2022
Commitments and Contingencies Disclosure [Abstract]  
Summary of Outstanding Commitments to Extend Credit and Letters of Credit
The following table presents the Corporation's commitments to extend credit and letters of credit:
20222021
 (dollars in thousands)
Commercial and industrial$4,832,858 $5,072,008 
Real estate - commercial mortgage and real estate - construction1,972,505 1,914,238 
Real estate - home equity1,890,258 1,744,922 
Total commitments to extend credit$8,695,621 $8,731,168 
Standby letters of credit$260,829 $298,275 
Commercial letters of credit49,288 54,196 
Total letters of credit$310,117 $352,471