Leases - Lease Cost and Other Lease Information (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Lease Costs
Operating lease costs	$ 620	$ 533
Variable lease costs	171	111
Short-term lease costs	15	15
Net lease cost	806	659
Cash paid for amounts included in the measurement of lease liabilities
Operating lease cash flows - Fixed payments	611	513
Operating lease cash flows - Liability reduction	530	$ 463
Right of use assets obtained during the period in exchange for operating lease liabilities	$ 128
Weighted average lease term (in years)		8 years 3 months 29 days
Weighted average discount rate (in percent)	3.05%	3.11%