10. Business Segments (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Interest Income	$ 9,532	$ 8,743
Service charges on deposits	386	366
Investment services and insurance income	151	197
Mortgage banking income, net	530	520
Title insurance income	276	256
Expenses:
Interest Expense	1,498	979
Provision for loan losses	1,450	680
Income tax expense	79	379
Net income (loss)	1,264	1,961
Total Assets	780,037		$ 780,253
Goodwill	2,884		$ 2,884
F&M Bank Member
Interest Income	9,501	8,704
Service charges on deposits	386	366
Investment services and insurance income	0	0
Mortgage banking income, net	0	0
Title insurance income	0	0
Other operating income	444	393
Total income	10,331	9,463
Expenses:
Interest Expense	1,500	981
Provision for loan losses	1,450	680
Salary and benefit expense	3,290	3,297
Other operating expenses	2,754	2,176
Total expense	8,994	7,134
Income (loss) before income taxes	1,337	2,329
Income tax expense	47	141
Net income (loss)	1,290	2,188
Net (income) loss attributable to noncontrolling interest	0	0
Net income attributable to F & M Bank Corp.	1,290	2,188
Total Assets	763,585	731,512
Goodwill	2,670	2,670
F&M Mortgage
Interest Income	25	29
Service charges on deposits	0	0
Investment services and insurance income	0	0
Mortgage banking income, net	530	520
Title insurance income	0	61
Other operating income	0	1
Total income	555	611
Expenses:
Interest Expense	26	23
Provision for loan losses	0	0
Salary and benefit expense	430	414
Other operating expenses	173	212
Total expense	629	649
Income (loss) before income taxes	(74)	(38)
Income tax expense	0	0
Net income (loss)	(74)	(38)
Net (income) loss attributable to noncontrolling interest	(22)	11
Net income attributable to F & M Bank Corp.	(52)	(27)
Total Assets	6,744	8,552
Goodwill	47	65
TEB Life/FMFS
Interest Income	34	35
Service charges on deposits	0	0
Investment services and insurance income	152	203
Mortgage banking income, net	0	0
Title insurance income	0	0
Other operating income	0	0
Total income	186	238
Expenses:
Interest Expense	0	0
Provision for loan losses	0	0
Salary and benefit expense	81	146
Other operating expenses	13	10
Total expense	94	156
Income (loss) before income taxes	92	82
Income tax expense	13	15
Net income (loss)	79	67
Net (income) loss attributable to noncontrolling interest	0	0
Net income attributable to F & M Bank Corp.	79	67
Total Assets	7,487	6,972
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	276	195
Other operating income	0	0
Total income	276	195
Expenses:
Interest Expense	0	0
Provision for loan losses	0	0
Salary and benefit expense	222	166
Other operating expenses	62	48
Total expense	284	214
Income (loss) before income taxes	(8)	(19)
Income tax expense	0	0
Net income (loss)	(8)	(19)
Net (income) loss attributable to noncontrolling interest	(2)	0
Net income attributable to F & M Bank Corp.	(6)	(19)
Total Assets	769	574
Goodwill	3	57
Parent Only
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	0	0
Other operating income	2	0
Total income	2	0
Expenses:
Interest Expense	0	0
Provision for loan losses	0	0
Salary and benefit expense	0	0
Other operating expenses	6	14
Total expense	6	14
Income (loss) before income taxes	(4)	(14)
Income tax expense	19	223
Net income (loss)	(23)	(237)
Net (income) loss attributable to noncontrolling interest	2	0
Net income attributable to F & M Bank Corp.	(25)	(237)
Total Assets	91,635	91,591
Goodwill	164	164
Eliminations
Interest Income	(28)	(25)
Service charges on deposits	0	0
Investment services and insurance income	(1)	(6)
Mortgage banking income, net	0	0
Title insurance income	0	0
Other operating income	0	0
Total income	(29)	(31)
Expenses:
Interest Expense	(28)	(25)
Provision for loan losses	0	0
Salary and benefit expense	0	0
Other operating expenses	(1)	(6)
Total expense	(29)	(31)
Income (loss) before income taxes	0	0
Income tax expense	0	0
Net income (loss)	0	0
Net (income) loss attributable to noncontrolling interest	0	0
Net income attributable to F & M Bank Corp.	0	0
Total Assets	(90,183)	(110,213)
Goodwill	0	0
F&M Bank Corp Consolidated
Interest Income	9,532	8,743
Service charges on deposits	386	366
Investment services and insurance income	151	197
Mortgage banking income, net	530	520
Title insurance income	276	256
Other operating income	446	394
Total income	11,321	10,476
Expenses:
Interest Expense	1,498	979
Provision for loan losses	1,450	680
Salary and benefit expense	4,023	4,023
Other operating expenses	3,007	2,454
Total expense	9,978	8,136
Income (loss) before income taxes	1,343	2,340
Income tax expense	79	379
Net income (loss)	1,264	1,961
Net (income) loss attributable to noncontrolling interest	(22)	11
Net income attributable to F & M Bank Corp.	1,286	1,972
Total Assets	780,037	728,988
Goodwill	$ 2,884	$ 2,956