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Note Fair value measurement (Assets and liabilities measured at fair value on a recurring basis) (Detail) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Assets        
Debt securities available-for-sale, at fair value $ 13,542,695 $ 13,300,184    
Trading account debt securities, excluding derivatives 39,217 37,787    
Mortgage servicing rights 167,813 169,777 $ 166,281 $ 168,031
Level 1        
Assets        
Debt securities available-for-sale, at fair value [1] 2,476,890 2,719,740    
Trading account debt securities, excluding derivatives [1] 6,764 6,278    
Mortgage servicing rights 0 0    
Derivatives 0 0    
Liabilities        
Derivatives 0 0    
Level 2        
Assets        
Debt securities available-for-sale, at fair value [1] 11,064,570 10,579,211    
Trading account debt securities, excluding derivatives [1] 31,337 30,370    
Mortgage servicing rights 0 0    
Derivatives 14,843 13,603    
Liabilities        
Derivatives (12,770) (12,320)    
Level 3        
Assets        
Debt securities available-for-sale, at fair value [1] 1,235 1,233    
Trading account debt securities, excluding derivatives [1] 1,116 1,139    
Mortgage servicing rights 167,813 169,777    
Derivatives 0 0    
Liabilities        
Derivatives 0 0    
Recurring        
Assets        
Debt securities available-for-sale, at fair value 13,542,695 13,300,184    
Trading account debt securities, excluding derivatives 39,217 37,787    
Equity securities at fair value 17,658 13,296    
Mortgage servicing rights 167,813 169,777    
Derivatives 14,843 13,603    
Total 13,782,226 13,534,647    
Liabilities        
Derivatives (12,770) (12,320)    
Total (12,770) (12,320)    
Recurring | US Treasury Securities        
Assets        
Debt securities available-for-sale, at fair value 8,031,487 8,272,196    
Trading account debt securities, excluding derivatives 6,764 6,278    
Recurring | Obligations of U.S. Government sponsored entities        
Assets        
Debt securities available-for-sale, at fair value 264,671 333,309    
Recurring | Obligations of Puerto Rico, States and political subdivisions        
Assets        
Debt securities available-for-sale, at fair value 6,809 6,742    
Trading account debt securities, excluding derivatives 129 134    
Recurring | Collateralized Mortgage Obligations - Federal agencies        
Assets        
Debt securities available-for-sale, at fair value 701,766 728,671    
Recurring | Mortgage Backed Securities        
Assets        
Debt securities available-for-sale, at fair value 4,537,524 3,958,778    
Trading account debt securities, excluding derivatives 28,229 27,257    
Recurring | Other        
Assets        
Debt securities available-for-sale, at fair value 438 488    
Trading account debt securities, excluding derivatives 3,453 3,459    
Recurring | CMO        
Assets        
Trading account debt securities, excluding derivatives 642 659    
Recurring | Level 1        
Assets        
Debt securities available-for-sale, at fair value 2,476,890 2,719,740    
Trading account debt securities, excluding derivatives 6,764 6,278    
Equity securities at fair value 0 0    
Mortgage servicing rights 0 0    
Derivatives 0 0    
Total 2,483,654 2,726,018    
Liabilities        
Derivatives 0 0    
Total 0 0    
Recurring | Level 1 | US Treasury Securities        
Assets        
Debt securities available-for-sale, at fair value 2,476,890 2,719,740    
Trading account debt securities, excluding derivatives 6,764 6,278    
Recurring | Level 1 | Obligations of U.S. Government sponsored entities        
Assets        
Debt securities available-for-sale, at fair value 0 0    
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    
Recurring | Level 1 | Collateralized Mortgage Obligations - Federal agencies        
Assets        
Debt securities available-for-sale, at fair value 0 0    
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    
Recurring | Level 1 | Other        
Assets        
Debt securities available-for-sale, at fair value 0 0    
Trading account debt securities, excluding derivatives 0 0    
Recurring | Level 1 | CMO        
Assets        
Trading account debt securities, excluding derivatives 0 0    
Recurring | Level 2        
Assets        
Debt securities available-for-sale, at fair value 11,064,570 10,579,211    
Trading account debt securities, excluding derivatives 31,337 30,370    
Equity securities at fair value 17,658 13,296    
Mortgage servicing rights 0 0    
Derivatives 14,843 13,603    
Total 11,128,408 10,636,480    
Liabilities        
Derivatives (12,770) (12,320)    
Total (12,770) (12,320)    
Recurring | Level 2 | US Treasury Securities        
Assets        
Debt securities available-for-sale, at fair value 5,554,597 5,552,456    
Trading account debt securities, excluding derivatives 0 0    
Recurring | Level 2 | Obligations of U.S. Government sponsored entities        
Assets        
Debt securities available-for-sale, at fair value 264,671 333,309    
Recurring | Level 2 | Obligations of Puerto Rico, States and political subdivisions        
Assets        
Debt securities available-for-sale, at fair value 6,809 6,742    
Trading account debt securities, excluding derivatives 129 134    
Recurring | Level 2 | Collateralized Mortgage Obligations - Federal agencies        
Assets        
Debt securities available-for-sale, at fair value 701,766 728,671    
Recurring | Level 2 | Mortgage Backed Securities        
Assets        
Debt securities available-for-sale, at fair value 4,536,289 3,957,545    
Trading account debt securities, excluding derivatives 28,186 27,214    
Recurring | Level 2 | Other        
Assets        
Debt securities available-for-sale, at fair value 438 488    
Trading account debt securities, excluding derivatives 2,975 2,974    
Recurring | Level 2 | CMO        
Assets        
Trading account debt securities, excluding derivatives 47 48    
Recurring | Level 3        
Assets        
Debt securities available-for-sale, at fair value 1,235 1,233    
Trading account debt securities, excluding derivatives 1,116 1,139    
Equity securities at fair value 0 0    
Mortgage servicing rights 167,813 169,777    
Derivatives 0 0    
Total 170,164 172,149    
Liabilities        
Derivatives 0 0    
Total 0 0    
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    
Recurring | Level 3 | Obligations of U.S. Government sponsored entities        
Assets        
Debt securities available-for-sale, at fair value 0 0    
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    
Recurring | Level 3 | Collateralized Mortgage Obligations - Federal agencies        
Assets        
Debt securities available-for-sale, at fair value 0 0    
Recurring | Level 3 | Mortgage Backed Securities        
Assets        
Debt securities available-for-sale, at fair value 1,235 1,233    
Trading account debt securities, excluding derivatives 43 43    
Recurring | Level 3 | Other        
Assets        
Debt securities available-for-sale, at fair value 0 0    
Trading account debt securities, excluding derivatives 478 485    
Recurring | Level 3 | CMO        
Assets        
Trading account debt securities, excluding derivatives $ 595 $ 611    
[1]

Refer to Note 24 to the C onsolidated F inancial S tatements for the fair value by class of financial asset and its hierarchy level.