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Commitments and Contingent Liabilities (Tables)
 3 Months Ended
Mar. 31, 2024
Commitments and Contingencies Disclosure [Abstract]  
Notional Amount of Outstanding Commitments
The following table identifies the notional amount of those instruments at the date shown below:
March 31, 2024December 31, 2023
 (dollars in thousands)
Financial instruments whose contract amounts represent credit risk:
Commitments to extend credit$2,423,326 $2,517,905 
Financial standby letters of credit13,504 14,300 
Performance standby letters of credit16,762 17,194 
Commercial letters of credit555 555