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Commitments and Contingent Liabilities (Tables)
6 Months Ended
Jun. 30, 2016
Commitments and Contingencies Disclosure [Abstract]  
Notional Amount of Outstanding Commitments
The following table identifies the notional amount of those instruments at:
 
June 30, 2016
 
December 31, 2015
 
(dollars in thousands)
Financial instruments whose contract amounts represent credit risk:
 
 
 
Commitments to extend credit
$
1,616,286

 
$
1,643,187

Financial standby letters of credit
19,256

 
17,843

Performance standby letters of credit
28,067

 
26,497

Commercial letters of credit
1,615

 
1,672