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Premises and equipment - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Property, Plant and Equipment [Line Items]      
Depreciation, Depletion and Amortization $ 47.1us-gaap_DepreciationDepletionAndAmortization $ 48.2us-gaap_DepreciationDepletionAndAmortization $ 46.7us-gaap_DepreciationDepletionAndAmortization
Occupancy Expense 23.8bpop_OccupancyExpense 24.8bpop_OccupancyExpense 24.2bpop_OccupancyExpense
Equipment Communications And Other Operating Expenses 23.3bpop_EquipmentCommunicationsAndOtherOperatingExpenses 23.4bpop_EquipmentCommunicationsAndOtherOperatingExpenses 22.5bpop_EquipmentCommunicationsAndOtherOperatingExpenses
Rental Income $ 28.1bpop_RentalIncome $ 26.6bpop_RentalIncome $ 22.9bpop_RentalIncome