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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