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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2021
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:
March 31,
2021
December 31, 2020
 (in thousands)
Commitments to extend credit$9,018,523 $8,651,055 
Standby letters of credit295,516 298,750 
Commercial letters of credit57,917 56,229