Goodwill and Other Intangible Assets - Narrative (Details) - USD ($) $ in Thousands	1 Months Ended		12 Months Ended
	Apr. 30, 2019	Jul. 31, 2011	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Acquired Finite-Lived Intangible Assets [Line Items]
Amortization expense			$ 1,398	$ 265	$ 528
MidCarolina
Acquired Finite-Lived Intangible Assets [Line Items]
Core deposit intangible		$ 6,556
Amortization period of intangible		108 months
MainStreet BankShares, Inc.
Acquired Finite-Lived Intangible Assets [Line Items]
Core deposit intangible			$ 1,839
Amortization period of intangible			120 months
HomeTown Bankshares Corporation
Acquired Finite-Lived Intangible Assets [Line Items]
Core deposit intangible	$ 8,200
Amortization period of intangible	120 months