Leases - Other information (Details) - ASU No. 2018-02, Leases (Topic 842) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
LEASES
Cash paid for amounts included in the measurement of lease liabilities - operating leases (in thousands)	$ 11,922	$ 12,863
ROU assets obtained in exchange for operating lease liabilities (in thousands)	$ 3,202	$ 7,992
Weighted average remaining lease term - operating leases	5 years 2 months 12 days	5 years 6 months
Weighted average discount rate - operating leases	2.82%	3.58%