Leases - Additional Information (Details) - USD ($)	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Leases [Abstract]
Description of operating lease expiration terms	operating leases and their terms expire between 2019 and 2030 and, in some instances, contain options to renew for periods up to 25 years.
Renewal option period for operating leases	25 years
Existence of option to expire	true
Total rental expense	$ 1,300,000	$ 1,100,000
Operating leases, minimum annual rental payments, receivable under sublease	$ 32,000
Operating leases, minimum annual rental payments receivable period under sublease	through July 31, 2019
Operating leases, rental income under sublease	$ 16,000	$ 16,000