Nature of Operations (Details) $ in Millions		3 Months Ended
	Jan. 13, 2021 USD ($) shares	Mar. 31, 2021 shares	Mar. 31, 2022 facility Office	Jul. 31, 2020
Related Party Transaction [Line Items]
Number of common stocks sold	1,477,575	1,477,575
Exchange ratio of shares	0.9980
Gross offering proceeds from sale of stocks | $	$ 14.8
Net proceeds from sale | $	$ 13.2
Number of full-service office | Office			7
Number of drive-thru facility | facility			1
Seneca-Cayuga Bancorp, Inc. (the "Holding Company")
Related Party Transaction [Line Items]
Number of common stocks sold		109,450
ESOP shares committed to be released (in shares)	109,450
Seneca Falls Savings Bank, MHC (the "Mutual Holding Company") | Seneca-Cayuga Bancorp, Inc. (the "Holding Company")
Related Party Transaction [Line Items]
Percentage of holding				60.10%