Operating Leases - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019
Leases [Abstract]
Right-of-use asset			$ 19,900
Lease liability			$ 22,039
Operating lease, weighted average remaining lease term (in years)			5 years 3 months 29 days
Operating lease, weighted average discount rate (percent)			2.79%
Rent Commitments Under Operating Leases Under Topic ASC 840
2019	$ 5,350
2020	5,160
2021	4,910
2022	4,480
2023	3,910
Thereafter	5,040
Rent expense in accordance with ASC 840	$ 4,700	$ 4,320