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Commitments and Contingencies (Tables)
3 Months Ended
Mar. 31, 2015
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,
2015
 
December 31, 2014
 
(in thousands)
Commitments to extend credit
$
4,575,869

 
$
4,389,064

Standby letters of credit
379,947

 
382,465

Commercial letters of credit
36,049

 
32,304