Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2016

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:

	2016		2015
	(in thousands)
Commercial and other	$	3,673,815	$	3,518,960
Home equity	1,368,465		1,300,062
Commercial mortgage and construction	1,033,287		965,116
Total commitments to extend credit	$	6,075,567	$	5,784,138
Standby letters of credit	$	356,359	$	374,729
Commercial letters of credit	38,901		39,529
Total letters of credit	$	395,260	$	414,258