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INVESTMENT SECURITIES - Investment Securities Available for Sale (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Mar. 31, 2021
Dec. 31, 2020
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost $ 6,836,842 $ 6,534,503    
Gross unrealized gain 6,358 28,900    
Gross unrealized loss 417,829 108,537    
Allowance for Credit Losses 711 1,105 $ 1,183 $ 1,310
Fair value $ 6,424,660 $ 6,453,761    
Weighted-average yield 1.11% 1.03%    
U.S. Treasury securities [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost Due within one year   $ 149,660    
Gross Unrealized gains Due within one year   59    
Gross Unrealized losses Due within one year   1,233    
Allowance for Credit Losses within one year   0    
Fair value Due within one year   $ 148,486    
Weighted-average yield Due within one year   0.68%    
Amortized cost After 1 to 5 years $ 149,462      
Gross Unrealized gains After 1 to 5 years 0      
Gross Unrealized losses After 1 to 5 years 6,713      
Allowance for Credit Losses After 1 to 5 years 0      
Fair value After 1 to 5 years $ 142,749      
Weighted-average yield After 1 to 5 years 0.68%      
U.S. government-sponsored agencies obigations [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost After 1 to 5 years $ 2,340,512 $ 1,877,181    
Gross Unrealized gains After 1 to 5 years 28 240    
Gross Unrealized losses After 1 to 5 years 122,189 29,555    
Allowance for Credit Losses After 1 to 5 years 0 0    
Fair value After 1 to 5 years $ 2,218,351 $ 1,847,866    
Weighted-average yield After 1 to 5 years 0.77% 0.60%    
Amortized cost After 5 to 10 years $ 239,860 $ 403,785    
Gross Unrealized gains After 5 to 10 years 62 175    
Gross Unrealized losses After 5 to 10 years 19,049 10,856    
Allowance for Credit Losses After 5 to 10 years 0 0    
Fair value After 5 to 10 years $ 220,873 $ 393,104    
Weighted-average yield After 5 to 10 years 0.96% 0.90%    
Amortized cost After 10 years $ 14,775 $ 15,788    
Gross Unrealized gains After 10 years 202 224    
Gross Unrealized losses After 10 years 0 0    
Allowance for Credit Losses After 10 years 0 0    
Fair value After 10 years $ 14,977 $ 16,012    
Weighted-average yield After 10 years 0.88% 0.63%    
Puerto Rico government obligations [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost After 10 years $ 3,498 $ 3,574    
Gross Unrealized gains After 10 years 0 0    
Gross Unrealized losses After 10 years 463 416    
Allowance for Credit Losses After 10 years 308 308    
Fair value After 10 years $ 2,727 $ 2,850    
Weighted-average yield After 10 years 0.00% 0.00%    
Allowance for Credit Losses $ 308 $ 308 308 308
United States And Puerto Rico Government Obligations [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost 2,748,107 2,449,988    
Gross unrealized gain 292 698    
Gross unrealized loss 148,414 42,060    
Allowance for Credit Losses 308 308    
Fair value $ 2,599,677 $ 2,408,318    
Weighted-average yield 0.78% 0.67%    
MBS [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost $ 4,087,735 $ 4,083,515    
Gross unrealized gain 6,066 28,202    
Gross unrealized loss 269,415 66,477    
Allowance for Credit Losses 403 797    
Fair value $ 3,823,983 $ 4,044,443    
Weighted-average yield 1.34% 1.26%    
MBS [Member] | FHLMC [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost After 1 to 5 years $ 6,181 $ 2,811    
Gross Unrealized gains After 1 to 5 years 19 119    
Gross Unrealized losses After 1 to 5 years 11 0    
Allowance for Credit Losses After 1 to 5 years 0 0    
Fair value After 1 to 5 years $ 6,189 $ 2,930    
Weighted-average yield After 1 to 5 years 2.33% 2.65%    
Amortized cost After 5 to 10 years $ 207,503 $ 193,234    
Gross Unrealized gains After 5 to 10 years 207 2,419    
Gross Unrealized losses After 5 to 10 years 7,905 1,122    
Allowance for Credit Losses After 5 to 10 years 0 0    
Fair value After 5 to 10 years $ 199,805 $ 194,531    
Weighted-average yield After 5 to 10 years 1.37% 1.29%    
Amortized cost After 10 years $ 1,221,834 $ 1,240,964    
Gross Unrealized gains After 10 years 194 3,748    
Gross Unrealized losses After 10 years 94,235 23,503    
Allowance for Credit Losses After 10 years 0 0    
Fair value After 10 years $ 1,127,793 $ 1,221,209    
Weighted-average yield After 10 years 1.26% 1.18%    
Amortized cost $ 1,435,518 $ 1,437,009    
Gross unrealized gain 420 6,286    
Gross unrealized loss 102,151 24,625    
Allowance for Credit Losses 0 0    
Fair value $ 1,333,787 $ 1,418,670    
Weighted-average yield 1.28% 1.20%    
MBS [Member] | GNMA [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost Due within one year $ 7 $ 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 $ 7 $ 2    
Weighted-average yield Due within one year 1.70% 1.32%    
Amortized cost After 1 to 5 years $ 22,699 $ 16,714    
Gross Unrealized gains After 1 to 5 years 201 572    
Gross Unrealized losses After 1 to 5 years 265 0    
Allowance for Credit Losses After 1 to 5 years 0 0    
Fair value After 1 to 5 years $ 22,635 $ 17,286    
Weighted-average yield After 1 to 5 years 2.05% 2.90%    
Amortized cost After 5 to 10 years $ 27,524 $ 27,271    
Gross Unrealized gains After 5 to 10 years 0 80    
Gross Unrealized losses After 5 to 10 years 1,097 139    
Allowance for Credit Losses After 5 to 10 years 0 0    
Fair value After 5 to 10 years $ 26,427 $ 27,212    
Weighted-average yield After 5 to 10 years 0.68% 0.51%    
Amortized cost After 10 years $ 297,566 $ 338,927    
Gross Unrealized gains After 10 years 3,595 7,091    
Gross Unrealized losses After 10 years 11,611 2,174    
Allowance for Credit Losses After 10 years 0 0    
Fair value After 10 years $ 289,550 $ 343,844    
Weighted-average yield After 10 years 1.69% 1.45%    
Amortized cost $ 347,796 $ 382,914    
Gross unrealized gain 3,796 7,743    
Gross unrealized loss 12,973 2,313    
Allowance for Credit Losses 0 0    
Fair value $ 338,619 $ 388,344    
Weighted-average yield 1.64% 1.45%    
MBS [Member] | FNMA [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost Due within one year $ 4,935 $ 4,975    
Gross Unrealized gains Due within one year 0 21    
Gross Unrealized losses Due within one year 6 0    
Allowance for Credit Losses within one year 0 0    
Fair value Due within one year $ 4,929 $ 4,996    
Weighted-average yield Due within one year 1.92% 2.03%    
Amortized cost After 1 to 5 years $ 16,108 $ 21,337    
Gross Unrealized gains After 1 to 5 years 194 424    
Gross Unrealized losses After 1 to 5 years 38 0    
Allowance for Credit Losses After 1 to 5 years 0 0    
Fair value After 1 to 5 years $ 16,264 $ 21,761    
Weighted-average yield After 1 to 5 years 2.85% 2.87%    
Amortized cost After 5 to 10 years $ 388,664 $ 298,771    
Gross Unrealized gains After 5 to 10 years 185 4,387    
Gross Unrealized losses After 5 to 10 years 14,483 1,917    
Allowance for Credit Losses After 5 to 10 years 0 0    
Fair value After 5 to 10 years $ 374,366 $ 301,241    
Weighted-average yield After 5 to 10 years 1.49% 1.41%    
Amortized cost After 10 years $ 1,382,595 $ 1,389,381    
Gross Unrealized gains After 10 years 1,339 8,953    
Gross Unrealized losses After 10 years 97,180 21,747    
Allowance for Credit Losses After 10 years 0 0    
Fair value After 10 years $ 1,286,754 $ 1,376,587    
Weighted-average yield After 10 years 1.31% 1.21%    
Amortized cost $ 1,792,302 $ 1,714,464    
Gross unrealized gain 1,718 13,785    
Gross unrealized loss 111,707 23,664    
Allowance for Credit Losses 0 0    
Fair value $ 1,682,313 $ 1,704,585    
Weighted-average yield 1.36% 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 1.12%      
Amortized cost After 1 to 5 years $ 35,157 $ 24,007    
Gross Unrealized gains After 1 to 5 years 50 1    
Gross Unrealized losses After 1 to 5 years 2,008 778    
Allowance for Credit Losses After 1 to 5 years 0 0    
Fair value After 1 to 5 years $ 33,199 $ 23,230    
Weighted-average yield After 1 to 5 years 1.25% 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 $ 467,368 $ 500,811    
Gross Unrealized gains After 10 years 82 290    
Gross Unrealized losses After 10 years 38,373 13,134    
Allowance for Credit Losses After 10 years 0 0    
Fair value After 10 years $ 429,077 $ 487,967    
Weighted-average yield After 10 years 1.21% 1.23%    
Amortized cost $ 502,593 $ 539,134    
Gross unrealized gain 132 388    
Gross unrealized loss 40,381 13,912    
Allowance for Credit Losses 0 0    
Fair value $ 462,344 $ 525,610    
Weighted-average yield 1.22% 1.22%    
MBS [Member] | Private label [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost After 10 years $ 9,526 $ 9,994    
Gross Unrealized gains After 10 years 0 0    
Gross Unrealized losses After 10 years 2,203 1,963    
Allowance for Credit Losses After 10 years 403 797    
Fair value After 10 years $ 6,920 $ 7,234    
Weighted-average yield After 10 years 2.96% 2.21%    
Gross unrealized loss $ 2,600      
Allowance for Credit Losses 403 $ 797 $ 875 $ 1,002
Fair value $ 6,900      
Weighted-average yield 2.96%      
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%