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Document and Entity Information - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2024
Feb. 21, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Period End Date Dec. 31, 2024    
Document Fiscal Year Focus 2024    
Document Fiscal Period Focus FY    
Trading Symbol FMAO    
Entity Registrant Name FARMERS & MERCHANTS BANCORP, INC.    
Entity Central Index Key 0000792966    
Current Fiscal Year End Date --12-31    
Entity Well-known Seasoned Issuer No    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Entity Filer Category Accelerated Filer    
Entity Small Business false    
Entity Emerging Growth Company false    
Entity Shell Company false    
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, Postal Zip Code 43502    
City Area Code 419    
Local Phone Number 446-2501    
Entity Incorporation, State or Country Code OH    
Document Annual Report true    
Document Transition Report false    
ICFR Auditor Attestation Flag true    
Entity Interactive Data Current Yes    
Entity Address, State or Province OH    
Title of 12(b) Security Common Stock, No Par Value    
Security Exchange Name NASDAQ    
Entity Common Stock, Shares Outstanding   13,700,311  
Entity Public Float     $ 292,595,026
Auditor Name Forvis Mazars, LLP    
Auditor Location Fort Wayne, Indiana    
Auditor Firm ID 686    
Auditor Opinion [Text Block]

Opinion on the Consolidated Financial Statements

We have audited the accompanying consolidated balance sheets of Farmers and Merchants Bancorp, Inc. (the “Company”) as of December 31, 2024 and 2023, the related consolidated statements of income, comprehensive income (loss), changes to stockholders’ equity, and cash flows for each of the years in the three-year period ended December 31, 2024, and the related notes (collectively referred to as the “financial statements”). In our opinion, the consolidated financial statements referred to above present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the years in the three-year period ended December 31, 2024, in conformity with accounting principles generally accepted in the United States of America.

We also have audited, in accordance with the standards of the Public Company Accounting Oversight Board (United States) (“PCAOB”), the Company’s internal control over financial reporting as of December 31, 2024, based on criteria established in Internal Control – Integrated Framework (2013) issued by the Committee of Sponsoring Organizations of the Treadway Commission and our report dated February 26, 2025, expressed an unqualified opinion thereon.

    
Documents Incorporated by Reference

Part III of Form 10-K – Portions of the definitive Proxy Statement for the 2025 Annual Meeting of Shareholders of Farmers & Merchants Bancorp, Inc.

    
Document Fin Stmt Error Correction true    
Document Financial Statement Restatement Recovery Analysis [Flag] false