Leases (Details)	3 Months Ended		6 Months Ended
	Jun. 30, 2020 USD ($) lease	Jun. 30, 2019 USD ($)	Jun. 30, 2020 USD ($) lease	Jun. 30, 2019 USD ($)	Dec. 31, 2019
Short-term lease expense	$ 34,000	$ 34,000	$ 68,000	$ 68,000
Variable lease payments	300,000	200,000	600,000	400,000
Operating lease cost	$ 1,897,000	1,893,000	$ 3,782,000	$ 3,785,000
Weighted-average remaining lease term-operating leases (Year)	7 years 2 months 12 days		7 years 2 months 12 days		8 years
Weighted average discount rate-operating leases	3.80%		3.80%		3.80%
Minimum [Member]
Term of contract	5 months		5 months
Maximum [Member]
Term of contract	12 years		12 years
Branches And Office Space [Member]
Number of leases | lease	21		21
Vehicles [Member]
Number of leases | lease	9		9
Equipment [Member]
Number of leases | lease	1		1
Professional Services [Member]
Short-term lease expense	$ 34,000	$ 34,000