Consolidated Statements of Income - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Interest and dividend income:
Loans, including fees	$ 37,026	$ 35,421
Debt securities:
Taxable	8,312	6,524
Tax-exempt	171	159
Dividends	309	324
Federal funds sold and interest earning deposits	9	79
Total interest and dividend income	45,827	42,507
Interest expense:
Interest on deposits	4,714	8,112
Interest on short-term borrowings	10	148
Interest on long-term borrowings	1,018	1,503
Interest on subordinated loans	1,790	1,101
Total interest expense	7,532	10,864
Net interest income	38,295	31,643
Provision for loan losses	1,022	4,707
Net interest income after provision for loan losses	37,273	26,936
Noninterest income:
Earnings and gain on bank owned life insurance	559	460
Net gains on sales and redemptions of investment securities	37	1,076
Gains (losses) on marketable equity securities	382	(629)
Net gains on sales of loans and foreclosed real estate	313	1,179
Net gains on sales of premises and equipment	201
Insurance agency revenue	1,048	955
Total noninterest income	6,231	6,485
Noninterest expense:
Salaries and employee benefits	14,384	13,468
Building and occupancy	3,121	3,013
Data processing	2,555	2,396
Professional and other services	1,627	1,210
Advertising	1,198	941
FDIC assessments	874	699
Audits and exams	725	507
Insurance agency expense	825	743
Community service activities	220	199
Foreclosed real estate expenses	46	50
Other expenses	1,920	1,854
Total noninterest expenses	27,495	25,080
Income before income taxes	16,009	8,341
Provision for income taxes	3,499	1,295
Net income attributable to noncontrolling interest and Pathfinder Bancorp, Inc.	12,510	7,046
Net income attributable to noncontrolling interest	103	96
Net income attributable to Pathfinder Bancorp, Inc.	$ 12,407	$ 6,950
Dividends per common share (Voting and Series A Non-Voting)	$ 0.28	$ 0.24
Voting Common Stock [Member]
Noninterest expense:
Earnings per common share- basic	2.07	1.17
Earnings per common share - diluted	2.07	1.17
Dividends per common share (Voting and Series A Non-Voting)	1,258
Series A Non voting [Member]
Noninterest expense:
Earnings per common share- basic	2.07
Earnings per common share - diluted	2.07
Voting and Series A Non-Voting [Member]
Noninterest expense:
Dividends per common share (Voting and Series A Non-Voting)	$ 0.28	$ 0.24
Service Charges on Deposit Accounts [Member]
Noninterest income:
Noninterest income	$ 1,464	$ 1,395
Loan Servicing Fees [Member]
Noninterest income:
Noninterest income	246	361
Debit Card Interchange Fees [Member]
Noninterest income:
Noninterest income	923	771
Other Charges, Commissions & Fees [Member]
Noninterest income:
Noninterest income	$ 1,058	$ 917