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Earnings per Common Share - Calculations of Basic and Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Net income attributable to Pathfinder Bancorp, Inc. $ 2,599 $ 2,950
Dividends per common share (Voting and Series A Non-Voting) $ 0.09 $ 0.09
Warrant dividends $ 11 $ 11
Series A Nonvoting Common Stock [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Dividends per common share (Voting and Series A Non-Voting) $ 124 $ 124
Warrant dividends $ 11 $ 11
Undistributed earnings allocated to participating securities 1,586 1,857
Net income available to common shareholders- Voting $ 586 $ 673
Basic weighted average common shares outstanding- Voting 1,380 1,380
Diluted weighted average common shares outstanding- Voting 1,380 1,380
Earnings per common share- basic $ 0.43 $ 0.49
Earnings per common share - diluted 0.43 0.49
Voting Common Stock [Member]    
Antidilutive Securities Excluded From Computation Of Earnings Per Share [Line Items]    
Dividends per common share (Voting and Series A Non-Voting) $ 416 $ 409
Undistributed earnings allocated to participating securities $ 504 $ 600
Net income available to common shareholders- Voting $ 1,960 $ 2,215
Basic weighted average common shares outstanding- Voting 4,609 4,536
Diluted weighted average common shares outstanding- Voting 4,609 4,536
Earnings per common share- basic $ 0.43 $ 0.49
Earnings per common share - diluted $ 0.43 $ 0.49