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DEBT SECURITIES - Investment Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost $ 6,669,190 $ 6,534,503
Gross Unrealized Gain 2,738 28,900
Gross Unrealized Loss 590,132 108,537
Allowance for Credit Losses 676 1,105
Fair value $ 6,081,120 $ 6,453,761
Weighted-average yield 1.17% 1.03%
U.S. Treasury securities [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost After 1 to 5 years $ 149,262 $ 149,660
Gross Unrealized Gains After 1 to 5 years 0 59
Gross Unrealized Losses After 1 to 5 years 7,915 1,233
Allowance for Credit Losses After 1 to 5 years 0 0
Fair value After 1 to 5 years $ 141,347 $ 148,486
Weighted-average yield After 1 to 5 years 0.68% 0.68%
U.S. government-sponsored agencies obigations [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost After 1 to 5 years $ 2,352,787 $ 1,877,181
Gross Unrealized Gains After 1 to 5 years 24 240
Gross Unrealized Losses After 1 to 5 years 152,520 29,555
Allowance for Credit Losses After 1 to 5 years 0 0
Fair value After 1 to 5 years $ 2,200,291 $ 1,847,866
Weighted-average yield After 1 to 5 years 0.79% 0.60%
Amortized cost After 5 to 10 years $ 227,548 $ 403,785
Gross Unrealized Gains After 5 to 10 years 65 175
Gross Unrealized Losses After 5 to 10 years 24,168 10,856
Allowance for Credit Losses After 5 to 10 years 0 0
Fair value After 5 to 10 years $ 203,445 $ 393,104
Weighted-average yield After 5 to 10 years 0.96% 0.90%
Amortized cost After 10 years $ 14,184 $ 15,788
Gross Unrealized Gains After 10 years 217 224
Gross Unrealized Losses After 10 years 0 0
Allowance for Credit Losses After 10 years 0 0
Fair value After 10 years $ 14,401 $ 16,012
Weighted-average yield After 10 years 2.04% 0.63%
Puerto Rico government obligations [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost After 10 years $ 3,441 $ 3,574
Gross Unrealized Gains After 10 years 0 0
Gross Unrealized Losses After 10 years 246 416
Allowance for Credit Losses After 10 years 386 308
Fair value After 10 years $ 2,809 $ 2,850
Weighted-average yield After 10 years 0.00% 0.00%
United States And Puerto Rico Government Obligations [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost $ 2,747,222 $ 2,449,988
Gross Unrealized Gain 306 698
Gross Unrealized Loss 184,849 42,060
Allowance for Credit Losses 386 308
Fair value $ 2,562,293 $ 2,408,318
Weighted-average yield 0.81% 0.67%
MBS [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost $ 3,920,968 $ 4,083,515
Gross Unrealized Gain 2,432 28,202
Gross Unrealized Loss 405,283 66,477
Allowance for Credit Losses 290 797
Fair value $ 3,517,827 $ 4,044,443
Weighted-average yield 1.43% 1.26%
MBS [Member] | FHLMC [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost After 1 to 5 years $ 5,347 $ 2,811
Gross Unrealized Gains After 1 to 5 years 1 119
Gross Unrealized Losses After 1 to 5 years 76 0
Allowance for Credit Losses After 1 to 5 years 0 0
Fair value After 1 to 5 years $ 5,272 $ 2,930
Weighted-average yield After 1 to 5 years 2.33% 2.65%
Amortized cost After 5 to 10 years $ 203,549 $ 193,234
Gross Unrealized Gains After 5 to 10 years 52 2,419
Gross Unrealized Losses After 5 to 10 years 9,852 1,122
Allowance for Credit Losses After 5 to 10 years 0 0
Fair value After 5 to 10 years $ 193,749 $ 194,531
Weighted-average yield After 5 to 10 years 1.44% 1.29%
Amortized cost After 10 years $ 1,175,621 $ 1,240,964
Gross Unrealized Gains After 10 years 9 3,748
Gross Unrealized Losses After 10 years 144,500 23,503
Allowance for Credit Losses After 10 years 0 0
Fair value After 10 years $ 1,031,130 $ 1,221,209
Weighted-average yield After 10 years 1.33% 1.18%
Amortized cost $ 1,384,517 $ 1,437,009
Gross Unrealized Gain 62 6,286
Gross Unrealized Loss 154,428 24,625
Allowance for Credit Losses 0 0
Fair value $ 1,230,151 $ 1,418,670
Weighted-average yield 1.35% 1.20%
MBS [Member] | GNMA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost Due within one year $ 6 $ 2
Gross Unrealized Gains Due within one year 0 0
Gross Unrealized Losses Due within one year 0 0
Allowance for Credit Losses within one year 0 0
Fair value Due within one year $ 6 $ 2
Weighted-average yield Due within one year 1.95% 1.32%
Amortized cost After 1 to 5 years $ 20,088 $ 16,714
Gross Unrealized Gains After 1 to 5 years 130 572
Gross Unrealized Losses After 1 to 5 years 329 0
Allowance for Credit Losses After 1 to 5 years 0 0
Fair value After 1 to 5 years $ 19,889 $ 17,286
Weighted-average yield After 1 to 5 years 2.04% 2.90%
Amortized cost After 5 to 10 years $ 42,090 $ 27,271
Gross Unrealized Gains After 5 to 10 years 0 80
Gross Unrealized Losses After 5 to 10 years 2,369 139
Allowance for Credit Losses After 5 to 10 years 0 0
Fair value After 5 to 10 years $ 39,721 $ 27,212
Weighted-average yield After 5 to 10 years 1.07% 0.51%
Amortized cost After 10 years $ 261,681 $ 338,927
Gross Unrealized Gains After 10 years 1,434 7,091
Gross Unrealized Losses After 10 years 18,926 2,174
Allowance for Credit Losses After 10 years 0 0
Fair value After 10 years $ 244,189 $ 343,844
Weighted-average yield After 10 years 2.01% 1.45%
Amortized cost $ 323,865 $ 382,914
Gross Unrealized Gain 1,564 7,743
Gross Unrealized Loss 21,624 2,313
Allowance for Credit Losses 0 0
Fair value $ 303,805 $ 388,344
Weighted-average yield 1.89% 1.45%
MBS [Member] | FNMA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost Due within one year $ 2,099 $ 4,975
Gross Unrealized Gains Due within one year 0 21
Gross Unrealized Losses Due within one year 2 0
Allowance for Credit Losses within one year 0 0
Fair value Due within one year $ 2,097 $ 4,996
Weighted-average yield Due within one year 2.41% 2.03%
Amortized cost After 1 to 5 years $ 15,905 $ 21,337
Gross Unrealized Gains After 1 to 5 years 161 424
Gross Unrealized Losses After 1 to 5 years 44 0
Allowance for Credit Losses After 1 to 5 years 0 0
Fair value After 1 to 5 years $ 16,022 $ 21,761
Weighted-average yield After 1 to 5 years 2.87% 2.87%
Amortized cost After 5 to 10 years $ 379,705 $ 298,771
Gross Unrealized Gains After 5 to 10 years 51 4,387
Gross Unrealized Losses After 5 to 10 years 19,210 1,917
Allowance for Credit Losses After 5 to 10 years 0 0
Fair value After 5 to 10 years $ 360,546 $ 301,241
Weighted-average yield After 5 to 10 years 1.51% 1.41%
Amortized cost After 10 years $ 1,325,053 $ 1,389,381
Gross Unrealized Gains After 10 years 591 8,953
Gross Unrealized Losses After 10 years 145,356 21,747
Allowance for Credit Losses After 10 years 0 0
Fair value After 10 years $ 1,180,288 $ 1,376,587
Weighted-average yield After 10 years 1.38% 1.21%
Amortized cost $ 1,722,762 $ 1,714,464
Gross Unrealized Gain 803 13,785
Gross Unrealized Loss 164,612 23,664
Allowance for Credit Losses 0 0
Fair value $ 1,558,953 $ 1,704,585
Weighted-average yield 1.42% 1.27%
MBS [Member] | Collateralized mortgage obligations guaranteed by FHLMC, FNMA and GNMA [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost Due within one year $ 68  
Gross Unrealized Gains Due within one year 0  
Gross Unrealized Losses Due within one year 0  
Allowance for Credit Losses within one year 0  
Fair value Due within one year $ 68  
Weighted-average yield Due within one year 2.54%  
Amortized cost After 1 to 5 years $ 33,228 $ 24,007
Gross Unrealized Gains After 1 to 5 years 3 1
Gross Unrealized Losses After 1 to 5 years 3,253 778
Allowance for Credit Losses After 1 to 5 years 0 0
Fair value After 1 to 5 years $ 29,978 $ 23,230
Weighted-average yield After 1 to 5 years 1.70% 1.31%
Amortized cost After 5 to 10 years   $ 14,316
Gross Unrealized Gains After 5 to 10 years   97
Gross Unrealized Losses After 5 to 10 years   0
Allowance for Credit Losses After 5 to 10 years   0
Fair value After 5 to 10 years   $ 14,413
Weighted-average yield After 5 to 10 years   0.76%
Amortized cost After 10 years $ 447,341 $ 500,811
Gross Unrealized Gains After 10 years 0 290
Gross Unrealized Losses After 10 years 58,840 13,134
Allowance for Credit Losses After 10 years 0 0
Fair value After 10 years $ 388,501 $ 487,967
Weighted-average yield After 10 years 1.27% 1.23%
Amortized cost $ 480,637 $ 539,134
Gross Unrealized Gain 3 388
Gross Unrealized Loss 62,093 13,912
Allowance for Credit Losses 0 0
Fair value $ 418,547 $ 525,610
Weighted-average yield 1.30% 1.22%
MBS [Member] | Private label [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost After 10 years $ 9,187 $ 9,994
Gross Unrealized Gains After 10 years 0 0
Gross Unrealized Losses After 10 years 2,526 1,963
Allowance for Credit Losses After 10 years 290 797
Fair value After 10 years $ 6,371 $ 7,234
Weighted-average yield After 10 years 4.42% 2.21%
Gross Unrealized Loss $ 2,800  
Allowance for Credit Losses 300 $ 800
Fair value $ 6,400  
Weighted-average yield 4.42%  
Other Debt Obligations [Member]    
Schedule Of Available For Sale Securities [Line Items]    
Amortized cost Due within one year $ 1,000 500
Gross Unrealized Gains Due within one year 0 0
Gross Unrealized Losses Due within one year 0 0
Allowance for Credit Losses within one year 0 0
Fair value Due within one year $ 1,000 $ 500
Weighted-average yield Due within one year 0.78% 0.72%
Amortized cost After 1 to 5 years   $ 500
Gross Unrealized Gains After 1 to 5 years   0
Gross Unrealized Losses After 1 to 5 years   0
Allowance for Credit Losses After 1 to 5 years   0
Fair value After 1 to 5 years   $ 500
Weighted-average yield After 1 to 5 years   0.84%
Amortized cost   $ 1,000
Gross Unrealized Gain   0
Gross Unrealized Loss   0
Allowance for Credit Losses   0
Fair value   $ 1,000
Weighted-average yield   0.78%