Leases - Narrative (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) item	Dec. 31, 2019 USD ($)
Leases
Number of leased branch offices | item	7
Weighted average remaining life of the lease terms	12 years 10 months 24 days
Weighted average discount rate	2.61%
Operating lease costs	$ 441
Deferred rent liability	185	$ 213
Operating lease right-of-use asset	$ 6,407
Operating Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List]	Other Assets
Operating lease liability	$ 6,407
Operating Lease, Liability, Statement of Financial Position [Extensible List]	Accrued Liabilities and Other Liabilities