Leases - Narrative (Details) - USD ($)	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Apr. 30, 2019	Jan. 01, 2019
Lessor, Lease, Description [Line Items]
Right-of-use assets	$ 5,340,000
Lease liabilities	5,369,000
Rent expense	$ 1,187,000
Rent expense		$ 919,000	$ 961,000
Accounting Standards Update 2016-02
Lessor, Lease, Description [Line Items]
Right-of-use assets					$ 4,400,000
Lease liabilities					$ 4,400,000
HomeTown Bankshares Corporation Merger
Lessor, Lease, Description [Line Items]
Right-of-use assets				$ 1,800,000
Lease liabilities				$ 1,800,000