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Note Regulatory capital requirements (Corporation's risk-based capital and leverage ratios) (Details) - USD ($)
$ in Thousands
Dec. 31, 2018
Dec. 31, 2017
Corporate    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Capital $ 5,354,199 $ 4,985,265
Capital to Risk Weighted Assets 19.54% 19.22%
Common Equity Tier One Capital $ 4,631,511 $ 4,226,519
Common Equity Tier One Capital Ratio 16.90% 16.30%
Tier One Risk Based Capital $ 4,631,511 $ 4,226,519
Tier One Risk Based Capital to Risk Weighted Assets 16.90% 16.30%
Tier One Leverage Capital $ 4,631,511 $ 4,226,519
Tier One Leverage Capital to Average Assets 9.88% 10.02%
Corporate | Capital Adequacy Minimum Requirement Plus Capital Conservation Buffer/Basel III    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Capital Required for Capital Adequacy $ 2,706,117 $ 2,399,052
Capital Required for Capital Adequacy to Risk Weighted Assets 9.875% 9.25%
Common Equity Tier One Capital Required For Capital Adequacy $ 1,746,987 $ 1,491,303
Common Equity Tier 1 Based Capital Minimum Requirement Ratio 6.375% 5.75%
Tier One Risk Based Capital Required for Capital Adequacy $ 2,158,043 $ 1,880,338
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 7.875% 7.25%
Tier One Leverage Capital Required for Capital Adequacy $ 1,875,057 $ 1,687,432
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 4.00% 4.00%
Banco Popular de Puerto Rico    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Capital $ 3,900,536 $ 3,793,268
Capital to Risk Weighted Assets 19.00% 19.73%
Common Equity Tier One Capital $ 3,638,009 $ 3,546,121
Common Equity Tier One Capital Ratio 17.72% 18.44%
Tier One Risk Based Capital $ 3,638,009 $ 3,546,121
Tier One Risk Based Capital to Risk Weighted Assets 17.72% 18.44%
Tier One Leverage Capital $ 3,638,009 $ 3,546,121
Tier One Leverage Capital to Average Assets 9.62% 10.67%
Banco Popular de Puerto Rico | Capital Adequacy Minimum Requirement Plus Capital Conservation Buffer/Basel III    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Capital Required for Capital Adequacy $ 2,027,005 $ 1,778,498
Capital Required for Capital Adequacy to Risk Weighted Assets 9.875% 9.25%
Common Equity Tier One Capital Required For Capital Adequacy $ 1,308,573 $ 1,105,553
Common Equity Tier 1 Based Capital Minimum Requirement Ratio 6.375% 5.75%
Tier One Risk Based Capital Required for Capital Adequacy $ 1,616,473 $ 1,393,958
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 7.875% 7.25%
Tier One Leverage Capital Required for Capital Adequacy $ 1,512,568 $ 1,328,818
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 4.00% 4.00%
PB    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Capital $ 1,148,253 $ 1,083,171
Capital to Risk Weighted Assets 17.82% 17.05%
Common Equity Tier One Capital $ 1,085,829 $ 1,010,232
Common Equity Tier One Capital Ratio 16.85% 15.90%
Tier One Risk Based Capital $ 1,085,829 $ 1,010,232
Tier One Risk Based Capital to Risk Weighted Assets 16.85% 15.90%
Tier One Leverage Capital $ 1,085,829 $ 1,010,232
Tier One Leverage Capital to Average Assets 12.42% 11.69%
PB | Capital Adequacy Minimum Requirement Plus Capital Conservation Buffer/Basel III    
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]    
Capital Required for Capital Adequacy $ 636,450 $ 587,809
Capital Required for Capital Adequacy to Risk Weighted Assets 9.875% 9.25%
Common Equity Tier One Capital Required For Capital Adequacy $ 410,873 $ 365,395
Common Equity Tier 1 Based Capital Minimum Requirement Ratio 6.375% 5.75%
Tier One Risk Based Capital Required for Capital Adequacy $ 507,549 $ 460,715
Tier One Risk Based Capital Required for Capital Adequacy to Risk Weighted Assets 7.875% 7.25%
Tier One Leverage Capital Required for Capital Adequacy $ 349,580 $ 345,681
Tier One Leverage Capital Required for Capital Adequacy to Average Assets 4.00% 4.00%