Leases (Narrative) (Details) $ in Thousands	9 Months Ended
	Sep. 30, 2020 USD ($) branch_office	Sep. 30, 2019 USD ($)	Dec. 31, 2019 USD ($)
Lessee, Lease, Description [Line Items]
Weighted average remaining lease term	20 years 4 months 24 days
Weighted average discount rate	3.26%
Total operating lease expense	$ 2,200	$ 1,900
Operating right-of-use lease assets	18,400		$ 19,669
Lease liabilities	$ 18,716
Minimum
Lessee, Lease, Description [Line Items]
Option extension period	5 years
Maximum
Lessee, Lease, Description [Line Items]
Option extension period	10 years
Land and Building
Lessee, Lease, Description [Line Items]
Number of branch locations | branch_office	8
Land
Lessee, Lease, Description [Line Items]
Number of branch locations | branch_office	9