Leases - Operating Leases for Premises and Equipment (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Rental expense, net of sublease income
Net rental expense	$ 12,723	$ 7,563	$ 7,712
Future minimum Operating Lease Payments
2019	8,780
2020	8,668
2021	7,961
2022	5,101
2023	2,632
Thereafter	34,638
Total	67,780
Future minimum Operating Lease Payments, Sublease Income
2019	903
2020	903
2021	892
Total	2,698
Future minimum Operating Lease Payments, Net Lease Payments
2019	7,877
2020	7,765
2021	7,069
2022	5,101
2023	2,632
Thereafter	34,638
Total	$ 65,082
Maximum
Leases for premises and equipment
Lease terms, including renewal options	45 years
Occupancy
Rental expense, net of sublease income
Rental expense charged to occupancy	$ 9,947	8,620	8,689
Less: sublease income	903	1,342	1,303
Net rental expense	9,044	7,278	7,386
Equipment
Rental expense, net of sublease income
Rental expense charged to equipment expense	$ 3,679	$ 285	$ 326