Leases - Operating Leases for Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Rental expense, net of sublease income
Net rental expense	$ 7,712	$ 7,493	$ 7,291
Future minimum Operating Lease Payments
2017	9,209
2018	7,812
2019	7,377
2020	6,106
2021	4,547
Thereafter	46,643
Total	81,694
Future minimum Operating Lease Payments, Sublease Income
2017	1,226
2018	963
2019	772
2020	772
2021	760
Thereafter	5
Total	4,498
Future minimum Operating Lease Payments, Net Lease Payments
2017	7,983
2018	6,849
2019	6,605
2020	5,334
2021	3,787
Thereafter	46,638
Total	$ 77,196
Maximum
Leases for premises and equipment
Lease terms, including renewal options	48 years
Occupancy
Rental expense, net of sublease income
Rental expense charged to occupancy	$ 8,689	8,698	8,373
Less: sublease income	1,303	1,588	1,464
Net rental expense	7,386	7,110	6,909
Equipment
Rental expense, net of sublease income
Rental expense charged to equipment expense	$ 326	$ 383	$ 382