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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
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