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DEBT SECURITIES - Available-For-Sale Investments' Fair Value And Gross Unrealized Losses (Detail) - USD ($) $ in Thousands | Dec. 31, 2022 | Dec. 31, 2021
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Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value Less than 12 months | $ 1,115,192 | $ 4,601,661
Unrealized Losses Less than 12 months | 125,343 | 76,269
Fair Value 12 months or more | 4,447,686 | 1,008,607
Unrealized Losses 12 months or more | 673,123 | 32,268
Total Fair Value | 5,562,878 | 5,610,268
Total Unrealized Losses | 798,466 | 108,537
Allowance for Credit Losses | 458 | 1,105
U.S. Treasury and U.S. government agencies obligations [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value Less than 12 months | 298,313 | 1,717,340
Unrealized Losses Less than 12 months | 18,057 | 25,401
Fair Value 12 months or more | 2,174,724 | 606,179
Unrealized Losses 12 months or more | 231,357 | 16,243
Total Fair Value | 2,473,037 | 2,323,519
Total Unrealized Losses | 249,414 | 41,644
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 | 2,201 | 2,850
Unrealized Losses 12 months or more | 755 | 416
Total Fair Value | 2,201 | 2,850
Total Unrealized Losses | 755 | 416
Allowance for Credit Losses | 400 | 300
MBS [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Allowance for Credit Losses | 83 | 797
MBS [Member] | Private label [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Allowance for Credit Losses | 100 | 800
MBS [Member] | FHLMC [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value Less than 12 months | 263,184 | 986,345
Unrealized Losses Less than 12 months | 45,776 | 16,144
Fair Value 12 months or more | 831,637 | 221,896
Unrealized Losses 12 months or more | 160,012 | 8,481
Total Fair Value | 1,094,821 | 1,208,241
Total Unrealized Losses | 205,788 | 24,625
MBS [Member] | GNMA [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value Less than 12 months | 74,829 | 194,271
Unrealized Losses Less than 12 months | 3,433 | 1,329
Fair Value 12 months or more | 179,854 | 41,233
Unrealized Losses 12 months or more | 28,167 | 984
Total Fair Value | 254,683 | 235,504
Total Unrealized Losses | 31,600 | 2,313
MBS [Member] | FNMA [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value Less than 12 months | 424,178 | 1,237,701
Unrealized Losses Less than 12 months | 51,289 | 19,843
Fair Value 12 months or more | 938,625 | 112,559
Unrealized Losses 12 months or more | 172,860 | 3,821
Total Fair Value | 1,362,803 | 1,350,260
Total Unrealized Losses | 224,149 | 23,664
MBS [Member] | Collateralized mortgage obligations guaranteed by FHLMC, FNMA and GNMA [Member] |  |
Schedule Of Available For Sale Securities [Line Items] |  |
Fair Value Less than 12 months | 54,688 | 466,004
Unrealized Losses Less than 12 months | 6,788 | 13,552
Fair Value 12 months or more | 314,851 | 16,656
Unrealized Losses 12 months or more | 77,946 | 360
Total Fair Value | 369,539 | 482,660
Total Unrealized Losses | 84,734 | 13,912
MBS [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 | 5,794 | 7,234
Unrealized Losses 12 months or more | 2,026 | 1,963
Total Fair Value | 5,794 | 7,234
Total Unrealized Losses | $ 2,026 | $ 1,963

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