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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2017
Commitments and Contingencies Disclosure [Abstract]  
Summary of Outstanding Commitments to Extend Credit and Letters of Credit
The following table presents commitments to extend credit and letters of credit:
 
2017
 
2016
 
(in thousands)
Commercial and other
$
3,689,700

 
$
3,673,815

Home equity
1,422,284

 
1,368,465

Commercial mortgage and construction
1,093,045

 
1,033,287

Total commitments to extend credit
$
6,205,029

 
$
6,075,567

 
 
 
 
Standby letters of credit
$
326,973

 
$
356,359

Commercial letters of credit
41,801

 
38,901

Total letters of credit
$
368,774

 
$
395,260