Parent Company Only Financial Statements - Balance Sheets (Details) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets
Cash and due from banks	$ 6,834	$ 5,868
Interest-bearing deposits in other banks	60,259	23,424
Other assets	10,300	8,773
Total assets	730,805	644,613
Liabilities and Shareholders' Equity
Junior subordinated debt	4,124	4,124
Other liabilities	7,256	6,464
Total liabilities	670,798	588,471
Shareholders’ Equity
Retained earnings	44,803	40,491
Accumulated other comprehensive income (loss), net	(538)	125
Total shareholders’ equity	60,007	56,142	$ 54,451	$ 52,633
Total liabilities and shareholders’ equity	730,805	644,613
Fauquier Bankshares, Inc [Member]
Assets
Cash and due from banks	282	243
Interest-bearing deposits in other banks	180	580
Investment in subsidiaries	63,410	59,334
Other assets	360	310
Total assets	64,232	60,467
Liabilities and Shareholders' Equity
Junior subordinated debt	4,124	4,124
Other liabilities	101	201
Total liabilities	4,225	4,325
Shareholders’ Equity
Common stock and additional paid-in capital	15,742	15,526
Retained earnings	44,803	40,491
Accumulated other comprehensive income (loss), net	(538)	125
Total shareholders’ equity	60,007	56,142
Total liabilities and shareholders’ equity	$ 64,232	$ 60,467