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Commitments and Contingent Liabilities (Tables)
9 Months Ended
Sep. 30, 2021
Commitments and Contingencies Disclosure [Abstract]  
Notional Amount of Outstanding Commitments The following table identifies the notional amount of those instruments at:
September 30, 2021December 31, 2020
 (dollars in thousands)
Financial instruments whose contract amounts represent credit risk:
Commitments to extend credit$2,270,058 $2,097,628 
Financial standby letters of credit15,914 15,988 
Performance standby letters of credit11,233 16,864 
Commercial letters of credit975 783