Leases - Additional Information (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Jan. 01, 2019	Dec. 31, 2017
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets		$ 16,772	$ 18,282
Operating lease liabilities		18,183	19,814
Total stockholders’ equity	$ 623,739	$ 763,784	$ 725,263		$ 583,122
Operating lease, weighted average remaining lease term		9 years 8 months 8 days	10 years 3 months 25 days
Lessee, operating lease, discount rate		3.41%	3.51%
Operating lease, expense	3,000
Cumulated adjustment for adoption of ASU
Lessee, Lease, Description [Line Items]
Total stockholders’ equity	125		$ (3,395)
Accounting Standards Update 2016-02
Lessee, Lease, Description [Line Items]
Operating lease right-of-use assets				$ 18,700
Operating lease liabilities				$ 20,200
Retained Earnings
Lessee, Lease, Description [Line Items]
Total stockholders’ equity	116,874	$ 191,418	162,752		72,737
Retained Earnings | Cumulated adjustment for adoption of ASU
Lessee, Lease, Description [Line Items]
Total stockholders’ equity	125		$ (3,395)		$ 2,043
Retained Earnings | Accounting Standards Update 2016-02 | Cumulated adjustment for adoption of ASU
Lessee, Lease, Description [Line Items]
Total stockholders’ equity	$ 125