Document and Entity Information - shares	9 Months Ended
	Sep. 30, 2018	Dec. 21, 2018
Document And Entity Information [Abstract]
Entity Registrant Name	Rhinebeck Bancorp, Inc.
Entity Central Index Key	0001751783
Trading Symbol	rbkb
Entity Current Reporting Status	Yes
Current Fiscal Year End Date	--12-31
Entity Filer Category	Non-accelerated Filer
Entity Common Stock, Shares Outstanding		100
Document Type	10-Q
Document Period End Date	Sep. 30, 2018
Amendment Flag	false
Document Fiscal Year Focus	2018
Document Fiscal Period Focus	Q3
Entity Small Business	true
Entity Emerging Growth Company	true
Entity Ex Transition Period	false