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Commitments and Letters of Credit (Tables)
12 Months Ended
Dec. 31, 2015
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:
 
2015
 
2014
 
(dollars in thousands)
Financial instruments whose contract amounts represent credit risk:
 
 
 
Commitments to extend credit
$
1,643,187

 
$
1,635,948

Financial standby letters of credit
17,843

 
36,075

Performance standby letters of credit
26,497

 
25,915

Commercial letters of credit
1,672

 
2,611