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Note Debt Securities Available for Sale (Amortized cost, gross unrealized gains and losses, approximate fair value, weighted average yield and contractual maturities of debt securities AFS) (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available-for-sale, at fair value | $ 13,047,617 |  | $ 10,176,923 |
Gross Unrealized Gains | 11,605 |  | 25,461 |
Gross Unrealized Losses | 319,993 |  | 133,085 |
Amortized Cost | $ 13,356,005 | [1] | $ 10,284,547 | [2]
Weighted Average Yield | 2.14% |  | 1.96% |
US Treasury Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available-for-sale, at fair value | $ 7,861,962 |  | $ 3,928,164 |
Gross Unrealized Gains | 25 |  | 289 |
Gross Unrealized Losses | 87,579 |  | 28,611 |
Amortized Cost | $ 7,949,516 |  | $ 3,956,486 |
Weighted Average Yield | 2.04% |  | 1.46% |
US Treasury Securities | Within 1 year |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available-for-sale, at fair value | $ 3,299,348 |  | $ 1,110,698 |
Gross Unrealized Gains | 16 |  | 8 |
Gross Unrealized Losses | 6,510 |  | 2,101 |
Amortized Cost | $ 3,305,842 |  | $ 1,112,791 |
Weighted Average Yield | 1.75% |  | 1.06% |
US Treasury Securities | After 1 and within 5 years |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available-for-sale, at fair value | $ 4,272,064 |  | $ 2,523,797 |
Gross Unrealized Gains | 0 |  | 0 |
Gross Unrealized Losses | 76,258 |  | 26,319 |
Amortized Cost | $ 4,348,322 |  | $ 2,550,116 |
Weighted Average Yield | 2.22% |  | 1.55% |
US Treasury Securities | After 5 to 10 years |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available-for-sale, at fair value | $ 290,550 |  | $ 293,669 |
Gross Unrealized Gains | 9 |  | 281 |
Gross Unrealized Losses | 4,811 |  | 191 |
Amortized Cost | $ 295,352 |  | $ 293,579 |
Weighted Average Yield | 2.64% |  | 2.24% |
Obligations of U.S. Government sponsored entities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available-for-sale, at fair value | $ 403,794 |  | $ 608,933 |
Gross Unrealized Gains | 5 |  | 43 |
Gross Unrealized Losses | 5,085 |  | 4,336 |
Amortized Cost | $ 408,874 |  | $ 613,226 |
Weighted Average Yield | 1.45% |  | 1.38% |
Obligations of U.S. Government sponsored entities | Within 1 year |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available-for-sale, at fair value | $ 218,983 |  | $ 275,507 |
Gross Unrealized Gains | 1 |  | 21 |
Gross Unrealized Losses | 1,081 |  | 818 |
Amortized Cost | $ 220,063 |  | $ 276,304 |
Weighted Average Yield | 1.46% |  | 1.26% |
Obligations of U.S. Government sponsored entities | After 1 and within 5 years |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available-for-sale, at fair value | $ 184,811 |  | $ 333,426 |
Gross Unrealized Gains | 4 |  | 22 |
Gross Unrealized Losses | 4,004 |  | 3,518 |
Amortized Cost | $ 188,811 |  | $ 336,922 |
Weighted Average Yield | 1.45% |  | 1.48% |
Obligations of Puerto Rico, States and political subdivisions |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available-for-sale, at fair value | $ 6,679 |  | $ 6,609 |
Gross Unrealized Gains | 0 |  | 0 |
Gross Unrealized Losses | 182 |  | 59 |
Amortized Cost | $ 6,861 |  | $ 6,668 |
Weighted Average Yield | 1.33% |  | 2.30% |
Obligations of Puerto Rico, States and political subdivisions | After 1 and within 5 years |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available-for-sale, at fair value | $ 6,679 |  | $ 6,609 |
Gross Unrealized Gains | 0 |  | 0 |
Gross Unrealized Losses | 182 |  | 59 |
Amortized Cost | $ 6,861 |  | $ 6,668 |
Weighted Average Yield | 1.33% |  | 2.30% |
Collateralized Mortgage Obligations - Federal agencies |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available-for-sale, at fair value | $ 758,612 |  | $ 943,753 |
Gross Unrealized Gains | 1,208 |  | 3,019 |
Gross Unrealized Losses | 40,715 |  | 27,032 |
Amortized Cost | $ 798,119 |  | $ 967,766 |
Weighted Average Yield | 2.03% |  | 2.03% |
Collateralized Mortgage Obligations - Federal agencies | Within 1 year |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available-for-sale, at fair value |  |  | $ 40 |
Gross Unrealized Gains |  |  | 0 |
Gross Unrealized Losses |  |  | 0 |
Amortized Cost |  |  | $ 40 |
Weighted Average Yield |  |  | 2.60% |
Collateralized Mortgage Obligations - Federal agencies | After 1 and within 5 years |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available-for-sale, at fair value | $ 898 |  | $ 17,070 |
Gross Unrealized Gains | 0 |  | 173 |
Gross Unrealized Losses | 8 |  | 75 |
Amortized Cost | $ 906 |  | $ 16,972 |
Weighted Average Yield | 1.92% |  | 2.90% |
Collateralized Mortgage Obligations - Federal agencies | After 5 to 10 years |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available-for-sale, at fair value | $ 109,457 |  | $ 35,717 |
Gross Unrealized Gains | 0 |  | 57 |
Gross Unrealized Losses | 6,397 |  | 526 |
Amortized Cost | $ 115,854 |  | $ 36,186 |
Weighted Average Yield | 1.67% |  | 2.31% |
Collateralized Mortgage Obligations - Federal agencies | After 10 years |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available-for-sale, at fair value | $ 648,257 |  | $ 890,926 |
Gross Unrealized Gains | 1,208 |  | 2,789 |
Gross Unrealized Losses | 34,310 |  | 26,431 |
Amortized Cost | $ 681,359 |  | $ 914,568 |
Weighted Average Yield | 2.10% |  | 2.01% |
Mortgage Backed Securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available-for-sale, at fair value | $ 4,016,013 |  | $ 4,688,662 |
Gross Unrealized Gains | 10,366 |  | 22,097 |
Gross Unrealized Losses | 186,432 |  | 73,047 |
Amortized Cost | $ 4,192,079 |  | $ 4,739,612 |
Weighted Average Yield | 2.41% |  | 2.44% |
Mortgage Backed Securities | Within 1 year |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available-for-sale, at fair value | $ 890 |  | $ 492 |
Gross Unrealized Gains | 11 |  | 8 |
Gross Unrealized Losses | 0 |  | 0 |
Amortized Cost | $ 879 |  | $ 484 |
Weighted Average Yield | 4.46% |  | 4.23% |
Mortgage Backed Securities | After 1 and within 5 years |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available-for-sale, at fair value | $ 4,623 |  | $ 14,594 |
Gross Unrealized Gains | 23 |  | 206 |
Gross Unrealized Losses | 148 |  | 211 |
Amortized Cost | $ 4,748 |  | $ 14,599 |
Weighted Average Yield | 2.31% |  | 3.50% |
Mortgage Backed Securities | After 5 to 10 years |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available-for-sale, at fair value | $ 340,820 |  | $ 337,786 |
Gross Unrealized Gains | 949 |  | 2,390 |
Gross Unrealized Losses | 11,726 |  | 3,765 |
Amortized Cost | $ 351,597 |  | $ 339,161 |
Weighted Average Yield | 2.21% |  | 2.21% |
Mortgage Backed Securities | After 10 years |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available-for-sale, at fair value | $ 3,669,680 |  | $ 4,335,790 |
Gross Unrealized Gains | 9,383 |  | 19,493 |
Gross Unrealized Losses | 174,558 |  | 69,071 |
Amortized Cost | $ 3,834,855 |  | $ 4,385,368 |
Weighted Average Yield | 2.43% |  | 2.46% |
Other |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available-for-sale, at fair value | $ 557 |  | $ 802 |
Gross Unrealized Gains | 1 |  | 13 |
Gross Unrealized Losses | 0 |  | 0 |
Amortized Cost | $ 556 |  | $ 789 |
Weighted Average Yield | 3.62% |  | 3.62% |
Other | After 5 to 10 years |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Debt securities available-for-sale, at fair value | $ 557 |  | $ 802 |
Gross Unrealized Gains | 1 |  | 13 |
Gross Unrealized Losses | 0 |  | 0 |
Amortized Cost | $ 556 |  | $ 789 |
Weighted Average Yield | 3.62% |  | 3.62% |
[1] | Includes $8.5 billion pledged to secure public and trust deposits, assets sold under agreements to repurchase, credit facilities and loan servicing agreements that the secured parties are not permitted to sell or repledge the collateral, of which $7.6 billion serve as collateral for public funds.
[2] | Includes $6.6 billion pledged to secure public and trust deposits, assets sold under agreements to repurchase, credit facilities and loan servicing agreements that the secured parties are not permitted to sell or repledge the collateral, of which $5.6 billion serve as collateral for public funds.

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- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 + Details
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