Leases - Summary of Components of Operating Lease Cost and Other Related Information (Details) - USD ($)	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Leases [Abstract]
Operating lease cost	$ 1,321,000		$ 2,501,000
Sublease income	(16,000)	$ (16,000)	(32,000)	$ (32,000)
Total Operating Lease Cost	1,305,000		2,469,000
Other Information
Cash paid for amounts included in the measurement of lease liabilities - operating cash flows from operating leases	1,231,000		2,308,000
Operating Lease - Operating Cash Flows (Liability reduction)	937,000		1,744,000
Right-of-use assets obtained in exchange for new operating lease liabilities	$ 4,656,000		$ 4,656,000
Weighted average lease term - operating Leases	8 years 6 months 21 days		8 years 6 months 21 days
Weighted average discount Rate - operating leases	3.38%		3.38%