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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.

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