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INVESTMENT SECURITIES - Available-For-Sale Investments' Fair Value And Gross Unrealized Losses (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]    
Fair Value Less than 12 months $ 4,099,363 $ 4,601,661
Unrealized Losses Less than 12 months 229,335 76,269
Fair Value 12 months or more 2,087,934 1,008,607
Unrealized Losses 12 months or more 188,494 32,268
Total Fair Value 6,187,297 5,610,268
Total Unrealized Losses 417,829 108,537
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 2,727 2,850
Unrealized Losses 12 months or more 463 416
Total Fair Value 2,727 2,850
Total Unrealized Losses 463 416
Puerto Rico government obligations [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Unrealized Losses 12 months or more 300 300
U.S. Treasury and U.S. government agencies obligations    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value Less than 12 months 1,717,041 1,717,340
Unrealized Losses Less than 12 months 80,078 25,401
Fair Value 12 months or more 854,995 606,179
Unrealized Losses 12 months or more 67,873 16,243
Total Fair Value 2,572,036 2,323,519
Total Unrealized Losses 147,951 41,644
MBS [Member] | FNMA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value Less than 12 months 1,053,447 1,237,701
Unrealized Losses Less than 12 months 60,002 19,843
Fair Value 12 months or more 548,419 112,559
Unrealized Losses 12 months or more 51,705 3,821
Total Fair Value 1,601,866 1,350,260
Total Unrealized Losses 111,707 23,664
MBS [Member] | FHLMC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value Less than 12 months 824,433 986,345
Unrealized Losses Less than 12 months 53,859 16,144
Fair Value 12 months or more 479,664 221,896
Unrealized Losses 12 months or more 48,292 8,481
Total Fair Value 1,304,097 1,208,241
Total Unrealized Losses 102,151 24,625
MBS [Member] | GNMA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Fair Value Less than 12 months 198,644 194,271
Unrealized Losses Less than 12 months 7,247 1,329
Fair Value 12 months or more 63,924 41,233
Unrealized Losses 12 months or more 5,726 984
Total Fair Value 262,568 235,504
Total Unrealized Losses 12,973 2,313
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 305,798 466,004
Unrealized Losses Less than 12 months 28,149 13,552
Fair Value 12 months or more 131,285 16,656
Unrealized Losses 12 months or more 12,232 360
Total Fair Value 437,083 482,660
Total Unrealized Losses 40,381 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 6,920 7,234
Unrealized Losses 12 months or more 2,203 1,963
Total Fair Value 6,920 7,234
Total Unrealized Losses 2,203 1,963
MBS [Member] | Private label [Member] | Financial Asset Acquired with Credit Deterioration [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Unrealized Losses 12 months or more $ 400 $ 800