Loans (Summary of Outstanding Principal Balance and Carrying Amount of Loans Acquired in Business Combination) (Details) - Fauquier Bankshares, Inc [Member] - USD ($)	Mar. 31, 2022	Dec. 31, 2021	Apr. 01, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual principal and interest at acquisition	$ 409,823	$ 448,780,000	$ 136,476,000
Total acquired loans	391,903	430,315,000
Acquired Loans - Purchased Credit Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual principal and interest at acquisition	70,058	76,608,000
Total acquired loans	57,802	64,383,000
Acquired Loans - Purchased Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual principal and interest at acquisition	339,765	372,172,000
Total acquired loans	334,101	365,932,000
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total acquired loans	22,127	29,059,000
Commercial [Member] | Acquired Loans - Purchased Credit Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual principal and interest at acquisition		994,000
Total acquired loans	913
Commercial [Member] | Acquired Loans - Purchased Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual principal and interest at acquisition		28,065,000
Total acquired loans	21,214
Real Estate Construction and Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total acquired loans	28,008	32,873,000
Real Estate Construction and Land [Member] | Acquired Loans - Purchased Credit Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual principal and interest at acquisition		18,576,000
Total acquired loans	16,412
Real Estate Construction and Land [Member] | Acquired Loans - Purchased Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual principal and interest at acquisition		14,297,000
Total acquired loans	11,596
1-4 Family Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total acquired loans	197,893	210,728,000
1-4 Family Residential Mortgages [Member] | Acquired Loans - Purchased Credit Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual principal and interest at acquisition		16,020,000
Total acquired loans	13,828
1-4 Family Residential Mortgages [Member] | Acquired Loans - Purchased Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual principal and interest at acquisition		194,708,000
Total acquired loans	184,065
Commercial Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total acquired loans	141,881	155,313,000
Commercial Mortgages [Member] | Acquired Loans - Purchased Credit Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual principal and interest at acquisition		28,675,000
Total acquired loans	26,544
Commercial Mortgages [Member] | Acquired Loans - Purchased Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual principal and interest at acquisition		126,638,000
Total acquired loans	115,337
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total acquired loans	1,994	2,342,000
Consumer [Member] | Acquired Loans - Purchased Credit Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual principal and interest at acquisition		118,000
Total acquired loans	105
Consumer [Member] | Acquired Loans - Purchased Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual principal and interest at acquisition		$ 2,224,000
Total acquired loans	$ 1,889