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Employee benefits - Information Popular Inc. shares of common stock held by the plans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Defined Benefit Plan, Plan Assets at Fair Value, Valuation Techniques and Inputs [Abstract] |  |
Shares of Popular, Inc. common stock | 156,444 | 152,804
Fair value of shares of Popular, Inc. common stock | $ 9,191 | $ 7,215
Dividends paid on shares of Popular, Inc. common stock held by the plan | $ 177 | $ 151

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