Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2017

Commitments and Contingencies [Abstract]

Off-Balance Sheet Financial Instruments

	December 31,
(in thousands)	2017		2016
Commitments to extend credit	$	6,689,033	$	5,878,290
Letters of credit		348,377		338,014

Future Minimum Lease Payments for Non-Cancelable Operating Leases

(in thousands)	Operating Leases
2018	$	16,307
2019		15,466
2020		13,815
2021		12,317
2022		12,099
Thereafter		81,826
Total minimum lease payments	$	151,830