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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Summary of Outstanding Commitments to Extend Credit and Letters of Credit
The outstanding amounts of commitments to extend credit and letters of credit were as follows:
 
March 31,
2017
 
December 31, 2016
 
(in thousands)
Commitments to extend credit
$
6,228,866

 
$
6,075,567

Standby letters of credit
357,313

 
356,359

Commercial letters of credit
38,003

 
38,901