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Commitments and Contingencies (Tables)
 12 Months Ended
Dec. 31, 2018
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:
 
2018
 
2017
 
(in thousands)
Commercial and other
$
3,642,545

 
$
3,689,700

Home equity
1,475,066

 
1,422,284

Commercial mortgage and construction
1,188,972

 
1,093,045

Total commitments to extend credit
$
6,306,583

 
$
6,205,029

 
 
 
 
Standby letters of credit
$
309,352

 
$
326,973

Commercial letters of credit
48,682

 
41,801

Total letters of credit
$
358,034

 
$
368,774