Loans (Summary of Outstanding Principal Balance and Carrying Amount of Loans Acquired in Business Combination) (Details) - Fauquier Bankshares, Inc [Member] - USD ($) $ in Thousands	Dec. 31, 2021	Apr. 01, 2021
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual principal and interest at acquisition	$ 448,780	$ 136,476
Total acquired loans	430,315
Acquired Loans - Purchased Credit Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual principal and interest at acquisition	76,608
Total acquired loans	64,383
Acquired Loans - Purchased Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Contractual principal and interest at acquisition	372,172
Total acquired loans	365,932
Commercial [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total acquired loans	29,059
Commercial [Member] | Acquired Loans - Purchased Credit Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total acquired loans	994
Commercial [Member] | Acquired Loans - Purchased Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total acquired loans	28,065
Real Estate Construction and Land [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total acquired loans	32,873
Real Estate Construction and Land [Member] | Acquired Loans - Purchased Credit Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total acquired loans	18,576
Real Estate Construction and Land [Member] | Acquired Loans - Purchased Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total acquired loans	14,297
1-4 Family Residential Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total acquired loans	210,728
1-4 Family Residential Mortgages [Member] | Acquired Loans - Purchased Credit Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total acquired loans	16,020
1-4 Family Residential Mortgages [Member] | Acquired Loans - Purchased Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total acquired loans	194,708
Commercial Mortgages [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total acquired loans	155,313
Commercial Mortgages [Member] | Acquired Loans - Purchased Credit Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total acquired loans	28,675
Commercial Mortgages [Member] | Acquired Loans - Purchased Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total acquired loans	126,638
Consumer [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total acquired loans	2,342
Consumer [Member] | Acquired Loans - Purchased Credit Impaired [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total acquired loans	118
Consumer [Member] | Acquired Loans - Purchased Performing [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Total acquired loans	$ 2,224