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Regulatory capital requirements (Tables)
12 Months Ended
Dec. 31, 2018
Table Text Block  
Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations [Table Text Block]
Actual Capital adequacy minimum requirement (including conservation capital buffer)
(Dollars in thousands)Amount RatioAmountRatio
2018
Total Capital (to Risk-Weighted Assets):
Corporation$5,354,19919.54%$2,706,1179.875%
BPPR3,900,53619.002,027,0059.875
PB1,148,25317.82636,4509.875
Common Equity Tier I Capital (to Risk-Weighted Assets):
Corporation$4,631,51116.90%$1,746,9876.375%
BPPR3,638,00917.721,308,5736.375
PB1,085,82916.85410,8736.375
Tier I Capital (to Risk-Weighted Assets):
Corporation$4,631,51116.90%$2,158,0437.875%
BPPR3,638,00917.721,616,4737.875
PB1,085,82916.85507,5497.875
Tier I Capital (to Average Assets):
Corporation $4,631,5119.88%$1,875,0574%
BPPR3,638,0099.621,512,5684
PB1,085,82912.42349,5804

Actual Capital adequacy minimum requirement (including conservation capital buffer)
(Dollars in thousands)Amount RatioAmountRatio
2017
Total Capital (to Risk-Weighted Assets):
Corporation$4,985,26519.22%$2,399,0529.250%
BPPR3,793,26819.731,778,4989.250
PB1,083,17117.05587,8099.250
Common Equity Tier I Capital (to Risk-Weighted Assets):
Corporation$4,226,51916.30%$1,491,3035.750%
BPPR3,546,12118.441,105,5535.750
PB1,010,23215.90365,3955.750
Tier I Capital (to Risk-Weighted Assets):
Corporation$4,226,51916.30%$1,880,3387.250%
BPPR3,546,12118.441,393,9587.250
PB1,010,23215.90460,7157.250
Tier I Capital (to Average Assets):
Corporation $4,226,51910.02%$1,687,4324%
BPPR3,546,12110.671,328,8184
PB1,010,23211.69345,6814
Schedule Of Minimum Amount And Ratios To Be Categorized As Well Capitalized [Table Text Block]
20182017
(Dollars in thousands)Amount Ratio Amount Ratio
Total Capital (to Risk-Weighted Assets):
BPPR$2,052,66410%$1,922,70010%
PB644,50610635,46910
Common Equity Tier I Capital (to Risk-Weighted Assets):
BPPR$1,334,2316.5%$1,249,7556.5%
PB418,9296.5413,0556.5
Tier I Capital (to Risk-Weighted Assets):
BPPR$1,642,1318%$1,538,1608%
PB515,6058508,3758
Tier I Capital (to Average Assets):
BPPR$1,890,7095%$1,661,0235%
PB436,9755432,1025
Schedule of Basel 3 Requirements [Table Text Block]
Minimum Capital Plus Capital Conservation Buffer
Minimum CapitalWell-Capitalized2018201920202021
Common Equity Tier 1 to Risk-Weighted Assets4.5%6.5%6.375%7.000%7.000%7.000%
Tier 1 Capital to Risk-Weighted Assets6.08.07.8758.5008.5008.500
Total Capital to Risk-Weighted Assets8.010.09.87510.50010.50010.500
Leverage Ratio4.05.0N/AN/AN/AN/A