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INVESTMENT SECURITIES - Available-For-Sale Investments' Fair Value And Gross Unrealized Losses (Detail) - USD ($)
$ in Thousands
Sep. 30, 2021
Dec. 31, 2020
Schedule of Available-for-sale Securities [Line Items]    
Fair Value Less than 12 months $ 5,068,253 $ 782,960
Unrealized Losses Less than 12 months 61,848 1,610
Fair Value 12 months or more 89,702 44,465
Unrealized Losses 12 months or more 3,743 3,907
Total Fair Value 5,157,955 827,425
Total Unrealized Losses 65,591 5,517
Puerto Rico Government obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value Less than 12 months 0 0
Unrealized Losses Less than 12 months 0 0
Fair Value 12 months or more 2,894 2,899
Unrealized Losses 12 months or more 478 780
Total Fair Value 2,894 2,899
Total Unrealized Losses 478 780
U.S. Treasury and U.S. government agencies obligations [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value Less than 12 months 2,018,246 425,155
Unrealized Losses Less than 12 months 15,805 621
Fair Value 12 months or more 47,550 23,377
Unrealized Losses 12 months or more 263 165
Total Fair Value 2,065,796 448,532
Total Unrealized Losses 16,068 786
Mortgage Backed Securities [Member] | FNMA [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value Less than 12 months 1,384,133 93,509
Unrealized Losses Less than 12 months 18,063 203
Fair Value 12 months or more 10,582 0
Unrealized Losses 12 months or more 319 0
Total Fair Value 1,394,715 93,509
Total Unrealized Losses 18,382 203
Mortgage Backed Securities [Member] | FHLMC [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value Less than 12 months 1,130,514 89,292
Unrealized Losses Less than 12 months 20,355 159
Fair Value 12 months or more 0 0
Unrealized Losses 12 months or more 0 0
Total Fair Value 1,130,514 89,292
Total Unrealized Losses 20,355 159
Mortgage Backed Securities [Member] | GNMA [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value Less than 12 months 108,272 70,504
Unrealized Losses Less than 12 months 1,573 217
Fair Value 12 months or more 0 0
Unrealized Losses 12 months or more 0 0
Total Fair Value 108,272 70,504
Total Unrealized Losses 1,573 217
Mortgage Backed Securities [Member] | Collateralized mortgage obligations guaranteed by the FHLMC, FNMA and GNMA [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value Less than 12 months 427,088 104,500
Unrealized Losses Less than 12 months 6,052 410
Fair Value 12 months or more 21,102 9,761
Unrealized Losses 12 months or more 397 82
Total Fair Value 448,190 114,261
Total Unrealized Losses 6,449 492
Mortgage Backed Securities [Member] | Private label [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value Less than 12 months 0 0
Unrealized Losses Less than 12 months 0 0
Fair Value 12 months or more 7,574 8,428
Unrealized Losses 12 months or more 2,286 2,880
Total Fair Value 7,574 8,428
Total Unrealized Losses $ 2,286 $ 2,880