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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
Jun. 30, 2018
Dec. 31, 2017
Debt Securities, Available-for-sale [Line Items]    
Debt securities available-for-sale, at fair value $ 10,542,010 $ 10,176,923
Gross Unrealized Gains 15,339 25,461
Gross Unrealized Losses 280,083 133,085
Amortized Cost $ 10,806,754 [1] $ 10,284,547 [2]
Weighted Average Yield 2.07% 1.96%
US Treasury Securities    
Debt Securities, Available-for-sale [Line Items]    
Debt securities available-for-sale, at fair value $ 4,976,965 $ 3,928,164
Gross Unrealized Gains 1,007 289
Gross Unrealized Losses 68,405 28,611
Amortized Cost $ 5,044,363 $ 3,956,486
Weighted Average Yield 1.85% 1.46%
US Treasury Securities | Within 1 year    
Debt Securities, Available-for-sale [Line Items]    
Debt securities available-for-sale, at fair value $ 1,273,353 $ 1,110,698
Gross Unrealized Gains 30 8
Gross Unrealized Losses 4,517 2,101
Amortized Cost $ 1,277,840 $ 1,112,791
Weighted Average Yield 1.42% 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 $ 3,314,741 $ 2,523,797
Gross Unrealized Gains 977 0
Gross Unrealized Losses 58,687 26,319
Amortized Cost $ 3,372,451 $ 2,550,116
Weighted Average Yield 1.93% 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 $ 388,871 $ 293,669
Gross Unrealized Gains 0 281
Gross Unrealized Losses 5,201 191
Amortized Cost $ 394,072 $ 293,579
Weighted Average Yield 2.50% 2.24%
Obligations of U.S. Government sponsored entities    
Debt Securities, Available-for-sale [Line Items]    
Debt securities available-for-sale, at fair value $ 531,876 $ 608,933
Gross Unrealized Gains 10 43
Gross Unrealized Losses 5,429 4,336
Amortized Cost $ 537,295 $ 613,226
Weighted Average Yield 1.43% 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 $ 287,822 $ 275,507
Gross Unrealized Gains 10 21
Gross Unrealized Losses 937 818
Amortized Cost $ 288,749 $ 276,304
Weighted Average Yield 1.37% 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 $ 244,054 $ 333,426
Gross Unrealized Gains 0 22
Gross Unrealized Losses 4,492 3,518
Amortized Cost $ 248,546 $ 336,922
Weighted Average Yield 1.50% 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 $ 6,643 $ 6,609
Gross Unrealized Gains 0 0
Gross Unrealized Losses 153 59
Amortized Cost $ 6,796 $ 6,668
Weighted Average Yield 1.76% 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 $ 6,643 $ 6,609
Gross Unrealized Gains 0 0
Gross Unrealized Losses 153 59
Amortized Cost $ 6,796 $ 6,668
Weighted Average Yield 1.76% 2.30%
Collateralized Mortgage Obligations - Federal agencies    
Debt Securities, Available-for-sale [Line Items]    
Debt securities available-for-sale, at fair value $ 809,669 $ 943,753
Gross Unrealized Gains 1,389 3,019
Gross Unrealized Losses 38,783 27,032
Amortized Cost $ 847,063 $ 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 $ 0 $ 40
Gross Unrealized Gains 0 0
Gross Unrealized Losses 0 0
Amortized Cost $ 0 $ 40
Weighted Average Yield 0.00% 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 $ 1,067 $ 17,070
Gross Unrealized Gains 0 173
Gross Unrealized Losses 8 75
Amortized Cost $ 1,075 $ 16,972
Weighted Average Yield 1.93% 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 $ 118,522 $ 35,717
Gross Unrealized Gains 0 57
Gross Unrealized Losses 6,214 526
Amortized Cost $ 124,736 $ 36,186
Weighted Average Yield 1.69% 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 $ 690,080 $ 890,926
Gross Unrealized Gains 1,389 2,789
Gross Unrealized Losses 32,561 26,431
Amortized Cost $ 721,252 $ 914,568
Weighted Average Yield 2.09% 2.01%
Mortgage Backed Securities    
Debt Securities, Available-for-sale [Line Items]    
Debt securities available-for-sale, at fair value $ 4,216,176 $ 4,688,662
Gross Unrealized Gains 12,929 22,097
Gross Unrealized Losses 167,313 73,047
Amortized Cost $ 4,370,560 $ 4,739,612
Weighted Average Yield 2.42% 2.44%
Mortgage Backed Securities | Within 1 year    
Debt Securities, Available-for-sale [Line Items]    
Debt securities available-for-sale, at fair value $ 970 $ 492
Gross Unrealized Gains 8 8
Gross Unrealized Losses 0 0
Amortized Cost $ 962 $ 484
Weighted Average Yield 4.25% 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 $ 6,604 $ 14,594
Gross Unrealized Gains 38 206
Gross Unrealized Losses 202 211
Amortized Cost $ 6,768 $ 14,599
Weighted Average Yield 2.70% 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 $ 325,345 $ 337,786
Gross Unrealized Gains 1,558 2,390
Gross Unrealized Losses 9,239 3,765
Amortized Cost $ 333,026 $ 339,161
Weighted Average Yield 2.24% 2.21%
Mortgage Backed Securities | After 10 years    
Debt Securities, Available-for-sale [Line Items]    
Debt securities available-for-sale, at fair value $ 3,883,257 $ 4,335,790
Gross Unrealized Gains 11,325 19,493
Gross Unrealized Losses 157,872 69,071
Amortized Cost $ 4,029,804 $ 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 $ 681 $ 802
Gross Unrealized Gains 4 13
Gross Unrealized Losses 0 0
Amortized Cost $ 677 $ 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 $ 681 $ 802
Gross Unrealized Gains 4 13
Gross Unrealized Losses 0 0
Amortized Cost $ 677 $ 789
Weighted Average Yield 3.62% 3.62%
[1]
Includes $8.2 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 $7.5 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.