Leases - Additional Information (Details) - USD ($)		3 Months Ended
		Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019
Lessee Lease Description [Line Items]
Remaining operating lease terms		6 years 1 month 6 days
Operating lease liabilities	[1]	$ 9,566,000
Operating right-of-use assets	[1]	7,738,000
Operating lease rent expense		$ 564,000	$ 522,000
ASU 2016-02
Lessee Lease Description [Line Items]
Lease renewal term		5 years
Operating lease, existence of option to terminate [true false]		true
Operating lease, Option to terminate description		Certain lease arrangements contain extension option which are typically around 5 years.
Operating lease liabilities				$ 9,900,000
Operating right-of-use assets		$ 8,057,000		$ 8,000,000
ASU 2016-02 | Minimum
Lessee Lease Description [Line Items]
Remaining operating lease terms		1 year
ASU 2016-02 | Maximum
Lessee Lease Description [Line Items]
Remaining operating lease terms		10 years

[1] The adoption of ASU 2016-02, Leases (Topic 842) in the first quarter of 2019 resulted in the recognition of right-of-use assets and lease liabilities on balance sheet.