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Note Fair value measurement (Assets and liabilities measured at fair value on a recurring basis) (Detail) - USD ($)
$ in Thousands
Sep. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Dec. 31, 2016
Assets          
Debt securities available-for-sale, at fair value $ 13,047,617   $ 10,176,923    
Trading account debt securities, excluding derivatives 37,731   33,926    
Mortgage servicing rights 162,779   168,031 $ 180,157 $ 196,889
Liabilities          
Contingent consideration   $ (171,000) (165,000)    
US Treasury Securities          
Assets          
Debt securities available-for-sale, at fair value 7,861,962   3,928,164    
Obligations of U.S. Government sponsored entities          
Assets          
Debt securities available-for-sale, at fair value 403,794   608,933    
Obligations of Puerto Rico, States and political subdivisions          
Assets          
Debt securities available-for-sale, at fair value 6,679   6,609    
Collateralized Mortgage Obligations - Federal agencies          
Assets          
Debt securities available-for-sale, at fair value 758,612   943,753    
Mortgage Backed Securities          
Assets          
Debt securities available-for-sale, at fair value 4,016,013   4,688,662    
Other          
Assets          
Debt securities available-for-sale, at fair value 557   802    
Level 1          
Assets          
Debt securities available-for-sale, at fair value 2,496,517 [1]   503,385    
Trading account debt securities, excluding derivatives 5,183 [1]   261    
Mortgage servicing rights 0   0    
Derivatives 0   0    
Liabilities          
Derivatives 0   0    
Contingent consideration     0    
Level 2          
Assets          
Debt securities available-for-sale, at fair value 10,549,837 [1]   9,672,250    
Trading account debt securities, excluding derivatives 31,363 [1]   32,384    
Mortgage servicing rights 0   0    
Derivatives 18,977   16,719    
Liabilities          
Derivatives (16,554)   (14,431)    
Contingent consideration     0    
Level 3          
Assets          
Debt securities available-for-sale, at fair value 1,263 [1]   1,288    
Trading account debt securities, excluding derivatives 1,185 [1]   1,101    
Mortgage servicing rights 162,779   168,031    
Derivatives 0   0    
Liabilities          
Derivatives 0   0    
Contingent consideration     (164,858)    
Fair Value, Measurements, Recurring          
Assets          
Debt securities available-for-sale, at fair value 13,047,617   10,176,923    
Trading account debt securities, excluding derivatives 37,731   33,746    
Mortgage servicing rights 162,779   168,031    
Equity securities at fair value 14,154   11,076    
Derivatives 18,977   16,719    
Total 13,281,258   10,406,495    
Liabilities          
Derivatives (16,554)   (14,431)    
Contingent consideration     (164,858)    
Total (16,554)   (179,289)    
Fair Value, Measurements, Recurring | US Treasury Securities          
Assets          
Debt securities available-for-sale, at fair value 7,861,962   3,928,164    
Trading account debt securities, excluding derivatives 5,183   261    
Fair Value, Measurements, Recurring | Obligations of U.S. Government sponsored entities          
Assets          
Debt securities available-for-sale, at fair value 403,794   608,933    
Fair Value, Measurements, Recurring | Obligations of Puerto Rico, States and political subdivisions          
Assets          
Debt securities available-for-sale, at fair value 6,679   6,609    
Trading account debt securities, excluding derivatives 143   159    
Fair Value, Measurements, Recurring | Collateralized Mortgage Obligations - Federal agencies          
Assets          
Debt securities available-for-sale, at fair value 758,612   943,753    
Fair Value, Measurements, Recurring | Mortgage Backed Securities          
Assets          
Debt securities available-for-sale, at fair value 4,016,013   4,688,662    
Trading account debt securities, excluding derivatives 28,237   29,280    
Fair Value, Measurements, Recurring | Other          
Assets          
Debt securities available-for-sale, at fair value 557   802    
Trading account debt securities, excluding derivatives 3,476   3,517    
Fair Value, Measurements, Recurring | Collateralized Mortgage Obligations          
Assets          
Trading account debt securities, excluding derivatives 692   529    
Fair Value, Measurements, Recurring | Level 1          
Assets          
Debt securities available-for-sale, at fair value 2,496,517   503,385    
Trading account debt securities, excluding derivatives 5,183   261    
Mortgage servicing rights 0   0    
Equity securities at fair value 0   0    
Derivatives 0   0    
Total 2,501,700   503,646    
Liabilities          
Derivatives 0   0    
Contingent consideration     0    
Total 0   0    
Fair Value, Measurements, Recurring | Level 1 | US Treasury Securities          
Assets          
Debt securities available-for-sale, at fair value 2,496,517   503,385    
Trading account debt securities, excluding derivatives 5,183   261    
Fair Value, Measurements, Recurring | Level 1 | Obligations of U.S. Government sponsored entities          
Assets          
Debt securities available-for-sale, at fair value 0   0    
Fair Value, Measurements, Recurring | Level 1 | Obligations of Puerto Rico, States and political subdivisions          
Assets          
Debt securities available-for-sale, at fair value 0   0    
Trading account debt securities, excluding derivatives 0   0    
Fair Value, Measurements, Recurring | Level 1 | Collateralized Mortgage Obligations - Federal agencies          
Assets          
Debt securities available-for-sale, at fair value 0   0    
Fair Value, Measurements, Recurring | Level 1 | Mortgage Backed Securities          
Assets          
Debt securities available-for-sale, at fair value 0   0    
Trading account debt securities, excluding derivatives 0   0    
Fair Value, Measurements, Recurring | Level 1 | Other          
Assets          
Debt securities available-for-sale, at fair value 0   0    
Trading account debt securities, excluding derivatives 0   0    
Fair Value, Measurements, Recurring | Level 1 | Collateralized Mortgage Obligations          
Assets          
Trading account debt securities, excluding derivatives 0   0    
Fair Value, Measurements, Recurring | Level 2          
Assets          
Debt securities available-for-sale, at fair value 10,549,837   9,672,250    
Trading account debt securities, excluding derivatives 31,363   32,384    
Mortgage servicing rights 0   0    
Equity securities at fair value 14,154   11,076    
Derivatives 18,977   16,719    
Total 10,614,331   9,732,429    
Liabilities          
Derivatives (16,554)   (14,431)    
Contingent consideration     0    
Total (16,554)   (14,431)    
Fair Value, Measurements, Recurring | Level 2 | US Treasury Securities          
Assets          
Debt securities available-for-sale, at fair value 5,365,445   3,424,779    
Trading account debt securities, excluding derivatives 0   0    
Fair Value, Measurements, Recurring | Level 2 | Obligations of U.S. Government sponsored entities          
Assets          
Debt securities available-for-sale, at fair value 403,794   608,933    
Fair Value, Measurements, Recurring | Level 2 | Obligations of Puerto Rico, States and political subdivisions          
Assets          
Debt securities available-for-sale, at fair value 6,679   6,609    
Trading account debt securities, excluding derivatives 143   159    
Fair Value, Measurements, Recurring | Level 2 | Collateralized Mortgage Obligations - Federal agencies          
Assets          
Debt securities available-for-sale, at fair value 758,612   943,753    
Fair Value, Measurements, Recurring | Level 2 | Mortgage Backed Securities          
Assets          
Debt securities available-for-sale, at fair value 4,014,750   4,687,374    
Trading account debt securities, excluding derivatives 28,194   29,237    
Fair Value, Measurements, Recurring | Level 2 | Other          
Assets          
Debt securities available-for-sale, at fair value 557   802    
Trading account debt securities, excluding derivatives 2,978   2,988    
Fair Value, Measurements, Recurring | Level 2 | Collateralized Mortgage Obligations          
Assets          
Trading account debt securities, excluding derivatives 48   0    
Fair Value, Measurements, Recurring | Level 3          
Assets          
Debt securities available-for-sale, at fair value 1,263   1,288    
Trading account debt securities, excluding derivatives 1,185   1,101    
Mortgage servicing rights 162,779   168,031    
Equity securities at fair value 0   0    
Derivatives 0   0    
Total 165,227   170,420    
Liabilities          
Derivatives 0   0    
Contingent consideration     (164,858)    
Total 0   (164,858)    
Fair Value, Measurements, Recurring | Level 3 | US Treasury Securities          
Assets          
Debt securities available-for-sale, at fair value 0   0    
Trading account debt securities, excluding derivatives 0   0    
Fair Value, Measurements, Recurring | Level 3 | Obligations of U.S. Government sponsored entities          
Assets          
Debt securities available-for-sale, at fair value 0   0    
Fair Value, Measurements, Recurring | Level 3 | Obligations of Puerto Rico, States and political subdivisions          
Assets          
Debt securities available-for-sale, at fair value 0   0    
Trading account debt securities, excluding derivatives 0   0    
Fair Value, Measurements, Recurring | Level 3 | Collateralized Mortgage Obligations - Federal agencies          
Assets          
Debt securities available-for-sale, at fair value 0   0    
Fair Value, Measurements, Recurring | Level 3 | Mortgage Backed Securities          
Assets          
Debt securities available-for-sale, at fair value 1,263   1,288    
Trading account debt securities, excluding derivatives 43   43    
Fair Value, Measurements, Recurring | Level 3 | Other          
Assets          
Debt securities available-for-sale, at fair value 0   0    
Trading account debt securities, excluding derivatives 498   529    
Fair Value, Measurements, Recurring | Level 3 | Collateralized Mortgage Obligations          
Assets          
Trading account debt securities, excluding derivatives $ 644   $ 529    
[1]
Refer to Note 25 to the Consolidated Financial Statements for the fair value by class of financial asset and its hierarchy level.