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Note Debt Securities Available for Sale (AFS debt securities in a continuous unrealized loss position) (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Fair Value | $ 6,864,155 | $ 4,498,383
Less than 12 months Gross Unrealized Losses | 95,566 | 30,555
12 months or more Fair Value | 5,293,951 | 4,651,571
12 months or more Gross Unrealized Losses | 224,427 | 102,530
Total Fair Value | 12,158,106 | 9,149,954
Total Gross Unrealized Losses | 319,993 | 133,085
US Treasury Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Fair Value | 5,699,061 | 2,608,473
Less than 12 months Gross Unrealized Losses | 57,506 | 14,749
12 months or more Fair Value | 1,617,265 | 1,027,066
12 months or more Gross Unrealized Losses | 30,073 | 13,862
Total Fair Value | 7,316,326 | 3,635,539
Total Gross Unrealized Losses | 87,579 | 28,611
Obligations of U.S. Government sponsored entities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Fair Value | 62,347 | 214,670
Less than 12 months Gross Unrealized Losses | 135 | 1,108
12 months or more Fair Value | 340,364 | 376,807
12 months or more Gross Unrealized Losses | 4,950 | 3,228
Total Fair Value | 402,711 | 591,477
Total Gross Unrealized Losses | 5,085 | 4,336
Obligations of Puerto Rico, States and political subdivisions |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Fair Value | 6,679 | 6,609
Less than 12 months Gross Unrealized Losses | 182 | 59
12 months or more Fair Value | 0 | 0
12 months or more Gross Unrealized Losses | 0 | 0
Total Fair Value | 6,679 | 6,609
Total Gross Unrealized Losses | 182 | 59
Collateralized Mortgage Obligations - Federal agencies |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Fair Value | 122,520 | 153,336
Less than 12 months Gross Unrealized Losses | 2,481 | 2,110
12 months or more Fair Value | 576,298 | 595,339
12 months or more Gross Unrealized Losses | 38,234 | 24,922
Total Fair Value | 698,818 | 748,675
Total Gross Unrealized Losses | 40,715 | 27,032
Mortgage Backed Securities |  |
Debt Securities, Available-for-sale [Line Items] |  |
Less than 12 months Fair Value | 973,548 | 1,515,295
Less than 12 months Gross Unrealized Losses | 35,262 | 12,529
12 months or more Fair Value | 2,760,024 | 2,652,359
12 months or more Gross Unrealized Losses | 151,170 | 60,518
Total Fair Value | 3,733,572 | 4,167,654
Total Gross Unrealized Losses | $ 186,432 | $ 73,047

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months. + References No definition available. + Details
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- Definition Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer. + References No definition available. + Details
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