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Document and Entity Information
Jun. 14, 2022
Cover [Abstract]  
Entity Registrant Name FARMERS & MERCHANTS BANCORP INC
Security Exchange Name NASDAQ
Amendment Flag false
Entity Central Index Key 0000792966
Document Type 8-K
Document Period End Date Jun. 14, 2022
Entity Incorporation State Country Code OH
Entity File Number 001-38084
Entity Tax Identification Number 34-1469491
Entity Address, Address Line One 307 North Defiance Street
Entity Address, City or Town Archbold
Entity Address, State or Province OH
Entity Address, Postal Zip Code 43502
City Area Code (419)
Local Phone Number 446-2501
Written Communications true
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security 12b Title Common Stock, No Par Value
Trading Symbol FMAO
Entity Emerging Growth Company false