BUSINESS SEGMENTS (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Interest Income	$ 31,274,000	$ 31,064,000
Service charges on deposits	1,133,000	1,191,000
Mortgage banking income, net	4,646,000	6,154,000
Title insurance income	2,074,000	1,978,000
Other operating income	913,000	597,000
Interest Expense	4,302,000	5,728,000
Salaries and benefits	14,102,000	12,738,000
Income tax expense (benefit)	1,323,000	1,142,000
Net income	10,738,000	8,893,000
Net Income attributable to F & M Bank Corp.	10,738,000	8,788,000
Total assets	1,219,342,000	966,930,000
Goodwill	3,082,000	2,884,000
F&M Bank
Interest Income	35,414,000	36,702,000
Service charges on deposits	1,133,000	1,191,000
Investment services and insurance income	0	1,000
Mortgage banking income, net	0	0
Title insurance income	0	0
Other operating income	2,499,000	2,189,000
Total income	39,046,000	40,083,000
Interest Expense	3,591,000	5,483,000
Provision for loan losses	2,800,000	3,300,000
Salaries and benefits	14,392,000	12,923,000
Other operating expenses	13,510,000	12,182,000
Total expense	28,693,000	33,888,000
Income before income taxes	10,353,000	6,195,000
Income tax expense (benefit)	1,266,000	925,000
Net income		5,270,000
Net income attributable to noncontrolling interest		0
Net Income attributable to F & M Bank Corp.	9,087,000	5,270,000
Total assets	1,227,059,000	972,129,000
Goodwill	2,868,000	2,670,000
F&M Mortgage
Interest Income	198,000	332,000
Service charges on deposits	0	0
Investment services and insurance income	0	0
Mortgage banking income, net	4,646,000	6,154,000
Title insurance income	0	0
Other operating income	134,000	182,000
Total income	4,978,000	6,668,000
Interest Expense	123,000	357,000
Provision for loan losses	0	0
Salaries and benefits	2,501,000	2,236,000
Other operating expenses	893,000	920,000
Total expense	3,517,000	3,513,000
Income before income taxes	1,461,000	3,155,000
Income tax expense (benefit)	0	0
Net income		3,155,000
Net income attributable to noncontrolling interest		105,000
Net Income attributable to F & M Bank Corp.	1,461,000	3,050,000
Total assets	10,334,000	20,157,000
Goodwill	47,000	47,000
TEB Life/FMFS
Interest Income	107,000	146,000
Service charges on deposits	0	0
Investment services and insurance income	953,000	709,000
Mortgage banking income, net	0	0
Title insurance income	0	0
Other operating income	0	0
Total income	1,060,000	855,000
Interest Expense	0	0
Provision for loan losses	21	0
Salaries and benefits	369,000	298,000
Other operating expenses	51,000	73,000
Total expense	399,000	371,000
Income before income taxes	661,000	484,000
Income tax expense (benefit)	134,000	98,000
Net income		386,000
Net income attributable to noncontrolling interest		0
Net Income attributable to F & M Bank Corp.	527,000	386,000
Total assets	8,803,000	8,023,000
Goodwill	0	0
VS Title
Interest Income	0	0
Service charges on deposits	0	0
Investment services and insurance income	0	0
Mortgage banking income, net	0	0
Title insurance income	2,074,000	1,978,000
Other operating income	0	0
Total income	2,074,000	1,978,000
Interest Expense	0	0
Provision for loan losses	0	0
Salaries and benefits	1,225,000	1,027,000
Other operating expenses	327,000	270,000
Total expense	1,552,000	1,297,000
Income before income taxes	522,000	681,000
Income tax expense (benefit)	0	0
Net income		681,000
Net income attributable to noncontrolling interest		0
Net Income attributable to F & M Bank Corp.	522,000	681,000
Total assets	3,135,000	2,992,000
Goodwill	3,000	3,000
Parent Only [Member]
Interest Income	1	0
Service charges on deposits	0	0
Investment services and insurance income	0	0
Mortgage banking income, net	0	0
Title insurance income	0	0
Other operating income	124,000	153
Total income	(123,000)	(153)
Interest Expense	732,000	276
Provision for loan losses	0	0
Salaries and benefits	0	0
Other operating expenses	81,000	51,000
Total expense	813,000	327,000
Income before income taxes	(936,000)	(480,000)
Income tax expense (benefit)	(77,000)	119,000
Net income		(599,000)
Net income attributable to noncontrolling interest		0
Net Income attributable to F & M Bank Corp.	(859,000)	(599,000)
Total assets	112,586,000	107,726,000
Goodwill	164,000	164,000
Eliminations
Interest Income	144,000	388,000
Service charges on deposits	0	0
Investment services and insurance income	(9,000)	(41,000)
Mortgage banking income, net	0	0
Title insurance income	0	0
Other operating income	0	0
Total income	(153,000)	(429,000)
Interest Expense	144,000	388,000
Provision for loan losses	0	0
Salaries and benefits	0	0
Other operating expenses	(9,000)	(41,000)
Total expense	153,000	(429,000)
Income before income taxes	0	0
Income tax expense (benefit)	0	0
Net income		0
Net income attributable to noncontrolling interest		0
Net Income attributable to F & M Bank Corp.	0	0
Total assets	142,575,000	144,108,000
Goodwill	0	0
F&M Bank Corp Consolidated
Interest Income	35,576,000	36,792,000
Service charges on deposits	1,133,000	1,191,000
Investment services and insurance income	944,000	669,000
Mortgage banking income, net	4,646,000	6,154,000
Title insurance income	2,074,000	1,978,000
Other operating income	2,509,000	2,218,000
Total income	46,882,000	49,002,000
Interest Expense	4,302,000	5,728,000
Provision for loan losses	2,821,000	3,300,000
Salaries and benefits	18,487,000	16,484,000
Other operating expenses	14,853,000	13,455,000
Total expense	34,821,000	38,967,000
Income before income taxes	12,061,000	10,035,000
Income tax expense (benefit)	1,323,000	1,142,000
Net income		8,893,000
Net income attributable to noncontrolling interest		105,000
Net Income attributable to F & M Bank Corp.	10,738,000	8,788,000
Total assets	1,219,342,000	966,930,000
Goodwill	$ 3,082,000	$ 2,884,000