Loans (Narrative) (Details) $ in Thousands	3 Months Ended		6 Months Ended	12 Months Ended
	Jun. 30, 2022 USD ($) Item	Jun. 30, 2021 USD ($) Item	Jun. 30, 2022 USD ($) Loan Item	Dec. 31, 2021 USD ($) Item Loan	Apr. 01, 2021 USD ($)
Loans And Leases Receivable Disclosure [Line Items]
Unamortized premium	$ 811		$ 811	$ 1,100
Net deferred loan costs (fees)	$ 504		504	(865)
Number of loans modified as TDRs | Item	0	0
Charged off			664	835
Fauquier Bankshares, Inc [Member]
Loans And Leases Receivable Disclosure [Line Items]
Loan receivable at fair value net				$ 611	$ 602,600
Purchased Impaired Loan [Member] | Fauquier Bankshares, Inc [Member]
Loans And Leases Receivable Disclosure [Line Items]
Loan receivable at fair value net	$ 12,300		12,300
Purchased Performing Loans [Member] | Fauquier Bankshares, Inc [Member]
Loans And Leases Receivable Disclosure [Line Items]
Loan receivable at fair value net	5,300		$ 5,300
Student Loans Purchased [Member]
Loans And Leases Receivable Disclosure [Line Items]
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 | Item			56
Total Troubled Debt Restructurings			$ 835
1-4 family residential-purchased [Member]
Loans And Leases Receivable Disclosure [Line Items]
Number of secured loans | Loan			0	0
Paycheck Protection Program (PPP) Loans [Member]
Loans And Leases Receivable Disclosure [Line Items]
Bank funded loan amount outstanding	1,900		$ 1,900
COVID-19 [Member]
Loans And Leases Receivable Disclosure [Line Items]
Loan deferrals	$ 0	$ 2,000	0	$ 1,200
Small Business Administration [Member] | Paycheck Protection Program (PPP) Loans [Member]
Loans And Leases Receivable Disclosure [Line Items]
Deferred fees increase			46
Small Business Administration [Member] | COVID-19 [Member] | Paycheck Protection Program (PPP) Loans [Member]
Loans And Leases Receivable Disclosure [Line Items]
Bank assisted nonprofit organizations and local businesses funded loans			$ 207,500