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Earnings per Common Share - Calculations of Basic and Diluted Earnings per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Earnings Per Share [Abstract]    
Net income attributable to Pathfinder Bancorp, Inc. $ 1,690 $ 514
Convertible preferred stock dividends 69  
Warrant dividends 8  
Undistributed earnings allocated to participating securities 290  
Net income available to common shareholders $ 1,323 $ 514
Basic weighted average common shares outstanding (in shares) 4,607 4,244
Effect of assumed exercise of stock options and unvested restricted stock units (in shares)   64
Diluted weighted average common shares outstanding (in shares) 4,607 4,308
Earnings per common share - basic $ 0.29 $ 0.12
Earnings per common share - diluted $ 0.29 $ 0.12