Consolidated Statements of Comprehensive (Loss) Income (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Consolidated Statements of Comprehensive Income [Abstract]
Net Income	$ 3,288	$ 3,024	$ 6,283	$ 5,216
Retirement Plans:
Retirement plan net losses recognized in plan expenses	1	26	1	53
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax, Total	1	26	1	53
Unrealized holding (losses) gains on available-for-sale securities:
Unrealized holding (losses) gains arising during the period	(6,172)	597	(11,953)	963
Reclassification adjustment for net gains included in net income	(26)	0	(25)	0
Net unrealized (losses) gains on available-for-sale securities	(6,198)	597	(11,978)	963
Derivatives and hedging activities:
Unrealized holding gains arising during the period	321	93	971	327
Net unrealized gains on derivatives and hedging activities	321	93	971	327
Accretion of net unrealized loss on securities transferred to held-to-maturity	0	6	0	13
Other comprehensive (loss) income, before tax	(5,876)	722	(11,006)	1,356
Tax effect	1,535	(189)	2,875	(355)
Other comprehensive (loss) income, net of tax	(4,341)	533	(8,131)	1,001
Comprehensive (loss) income	(1,053)	3,557	(1,848)	6,217
Comprehensive income, attributable to noncontrolling interest	16	15	61	53
Comprehensive (loss) income attributable to Pathfinder Bancorp, Inc.	(1,069)	3,542	(1,909)	6,164
Tax Effect Allocated to Each Component of Other Comprehensive Income (Loss)
Retirement plan net losses recognized in plan expenses	0	(7)	0	(15)
Unrealized holding gains (losses) on available-for-sale securities arising during the period	1,613	(156)	3,123	(251)
Reclassification adjustment for net gains included in net income	6	0	6	0
Unrealized gains on derivatives and hedging arising during the period	(84)	(24)	(254)	(85)
Accretion of net unrealized loss on securities transferred to held-to-maturity	0	(2)	0	(4)
Income tax effect related to other comprehensive income (loss)	$ 1,535	$ (189)	$ 2,875	$ (355)