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Commitments, Contingencies, and Guarantees (Tables)
 6 Months Ended
Jun. 30, 2017
Commitments and Contingencies Disclosure [Abstract]  
Credit commitments
The Company’s credit commitments as of June 30, 2017 and December 31, 2016 were as follows:
(dollars in thousands)
June 30,
2017

 
December 31,
2016

Unfunded Commitments to Extend Credit
$
2,800,247

 
$
2,732,734

Standby Letters of Credit
120,070

 
112,830

Commercial Letters of Credit
17,219

 
16,269

Total Credit Commitments
$
2,937,536

 
$
2,861,833