Loans (Narrative) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2022 USD ($) Loan	Dec. 31, 2021 USD ($) Loan Item	Apr. 01, 2021 USD ($)
Loans And Leases Receivable Disclosure [Line Items]
Unamortized premium	$ 1,400	$ 1,100
Net deferred loan costs (fees)	$ (755)	(865)
Commercial loan guarantee by SBA and USDA	100.00%
Loans	$ 936,415	1,061,211
Deposit account overdrafts	180	205
Charged off	1,255	835
Fauquier Bankshares, Inc [Member]
Loans And Leases Receivable Disclosure [Line Items]
Loan receivable at fair value net			$ 602,600
1-4 family residential-purchased [Member]
Loans And Leases Receivable Disclosure [Line Items]
Loans	$ 323,185	$ 358,148
Number of secured loans | Loan	0	0
1-4 family residential-purchased [Member] | Residential Mortgages [Member]
Loans And Leases Receivable Disclosure [Line Items]
Loans	$ 8,300	$ 10,600
Student Loans Purchased [Member]
Loans And Leases Receivable Disclosure [Line Items]
Loans	$ 25,200	$ 30,700
Extended period for repayment	12 months
Lifetime allowance period for military service	36 months
Grace period for repayment	6 months
Number of loans modified as TDRs | Item		5
Charged off		$ 56
Student Loans Purchased [Member] | Performing Loans [Member]
Loans And Leases Receivable Disclosure [Line Items]
Number of Loans classified as troubled debt restructuring | Loan	46	58
Total Troubled Debt Restructurings	$ 700	$ 935
Purchased Impaired Loan [Member] | Fauquier Bankshares, Inc [Member]
Loans And Leases Receivable Disclosure [Line Items]
Loan receivable at fair value net	11,200	12,200
Purchased Performing Loans [Member] | Fauquier Bankshares, Inc [Member]
Loans And Leases Receivable Disclosure [Line Items]
Loan receivable at fair value net	$ 4,700	$ 6,200