Fair value of acquired receivable from business combination, excluding certain loans and debt securities acquired in transfer.

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Amount, after accumulated amortization, of debt premium.

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Amount of writeoff of financing receivable, charged against allowance for credit loss.

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The increase (decrease) during the reporting period in net unamortized loan origination fees and other fees that are collected at origination but recorded as income over the life of the loan.

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Amount of financing receivable modified on trial basis.

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Amount of accumulated amortization of debt issuance costs (fees).

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Bank funded loan amount outstanding.

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Lifetime allowance period for military service.

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Number of loans modified as troubled debt restructuring.

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Number of loans receivables classified as troubled debt restructuring.

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Number of secured loans.

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Loans (Narrative) (Details) $ in Thousands	3 Months Ended		12 Months Ended
Loans (Narrative) (Details) $ in Thousands	Mar. 31, 2022 USD ($) Loan Item	Mar. 31, 2021 USD ($)	Dec. 31, 2021 USD ($) Item Loan	Apr. 01, 2021 USD ($)
Loans And Leases Receivable Disclosure [Line Items]
Unamortized premium	$ 913		$ 1,100
Net deferred loan costs (fees)	(632)		(865)
Charged off	473		835
Fauquier Bankshares, Inc [Member]
Loans And Leases Receivable Disclosure [Line Items]
Loan receivable at fair value net	611		$ 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
Purchased Performing Loans [Member] \| Fauquier Bankshares, Inc [Member]
Loans And Leases Receivable Disclosure [Line Items]
Loan receivable at fair value net	$ 5,700
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	$ 846
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	$ 10,000
COVID-19 [Member]
Loans And Leases Receivable Disclosure [Line Items]
Loan deferrals	670	$ 1,500
Small Business Administration [Member] \| Paycheck Protection Program (PPP) Loans [Member]
Loans And Leases Receivable Disclosure [Line Items]
Deferred fees increase	$ 179
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