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Commitments and Contingent Liabilities (Tables)
3 Months Ended
Mar. 31, 2022
Commitments and Contingencies Disclosure [Abstract]  
Notional Amount of Outstanding Commitments The following table identifies the notional amount of those instruments at:
March 31, 2022December 31, 2021
 (dollars in thousands)
Financial instruments whose contract amounts represent credit risk:
Commitments to extend credit$2,376,865 $2,353,991 
Financial standby letters of credit17,985 18,824 
Performance standby letters of credit17,584 10,663 
Commercial letters of credit975 975