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Commitments and Letters of Credit (Tables)
12 Months Ended
Dec. 31, 2018
Commitments and Contingencies Disclosure [Abstract]  
Notional Amount of Commitments and Letter of Credit Instruments
The following table identifies the notional amount of those instruments at December 31:
 
2018
 
2017
 
(dollars in thousands)
Financial instruments whose contract amounts represent credit risk:
 
 
 
Commitments to extend credit
$
1,883,914

 
$
1,840,180

Financial standby letters of credit
18,298

 
17,946

Performance standby letters of credit
22,027

 
20,472

Commercial letters of credit
887

 
1,149