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DEBT SECURITIES - Available-for-Sale Investments Classified by Contractual Maturity Date (Details) - USD ($)
$ in Thousands
Mar. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Dec. 31, 2023
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost $ 4,788,924 $ 5,125,408    
Gross Unrealized Gains 1,590 183    
Gross Unrealized Losses 477,114 559,768    
Allowance for Credit Losses 516 521 $ 442 $ 511
Fair value $ 4,312,884 $ 4,565,302    
Weighted-average yield 1.46% 1.45%    
Interest receivable $ 63,777 $ 71,881    
Available-for-Sale Securities [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Interest receivable 9,000 9,600    
Federal Home Loan Bank Borrowings [Member] | Asset Pledged as Collateral [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost 528,200 533,700    
Fair value 467,400 466,100    
U.S. Treasury securities [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost Due within one year 19,960 59,992    
Gross Unrealized Gains Due within one year 0 0    
Gross Unrealized Losses Due within one year 348 803    
Allowance for Credit Losses within one year 0 0    
Fair value Due within one year $ 19,612 $ 59,189    
Weighted-average yield Due within one year 0.65% 0.75%    
U.S. GSE's obligations [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost Due within one year $ 1,015,466 $ 1,090,678    
Gross Unrealized Gains Due within one year 0 0    
Gross Unrealized Losses Due within one year 17,837 22,826    
Allowance for Credit Losses within one year 0 0    
Fair value Due within one year $ 997,629 $ 1,067,852    
Weighted-average yield Due within one year 0.72% 0.79%    
Amortized cost After 1 to 5 years $ 692,123 $ 817,835    
Gross Unrealized Gains After 1 to 5 years 32 39    
Gross Unrealized Losses After 1 to 5 years 38,962 53,195    
Allowance for Credit Losses After 1 to 5 years 0 0    
Fair value After 1 to 5 years $ 653,193 $ 764,679    
Weighted-average yield After 1 to 5 years 0.98% 0.96%    
Amortized cost After 10 years $ 7,584 $ 7,835    
Gross Unrealized Gains After 10 years 0 0    
Gross Unrealized Losses After 10 years 35 35    
Allowance for Credit Losses After 10 years 0 0    
Fair value After 10 years $ 7,549 $ 7,800    
Weighted-average yield After 10 years 4.69% 4.73%    
Puerto Rico government obligations [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost After 10 years $ 2,899 $ 2,951    
Gross Unrealized Gains After 10 years 0 0    
Gross Unrealized Losses After 10 years 960 986    
Allowance for Credit Losses After 10 years 340 345    
Fair value After 10 years $ 1,599 $ 1,620    
Weighted-average yield After 10 years 0.00% 0.00%    
Allowance for Credit Losses $ 340 $ 345 326 395
United States And Puerto Rico Government Obligations [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost 1,738,032 1,979,291    
Gross Unrealized Gains 32 39    
Gross Unrealized Losses 58,142 77,845    
Allowance for Credit Losses 340 345    
Fair value $ 1,679,582 $ 1,901,140    
Weighted-average yield 0.84% 0.87%    
Residential MBS [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost $ 2,821,461 $ 2,922,124    
Gross Unrealized Gains 1,457 131    
Gross Unrealized Losses 380,857 440,826    
Allowance for Credit Losses 176 176    
Fair value $ 2,441,885 $ 2,481,253    
Weighted-average yield 1.79% 1.79%    
Residential MBS [Member] | Freddie Mac (FHLMC) certificates [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost After 1 to 5 years $ 12,881 $ 14,477    
Gross Unrealized Gains After 1 to 5 years 0 0    
Gross Unrealized Losses After 1 to 5 years 346 460    
Allowance for Credit Losses After 1 to 5 years 0 0    
Fair value After 1 to 5 years $ 12,535 $ 14,017    
Weighted-average yield After 1 to 5 years 2.14% 2.14%    
Amortized cost After 5 to 10 years $ 116,041 $ 122,548    
Gross Unrealized Gains After 5 to 10 years 0 0    
Gross Unrealized Losses After 5 to 10 years 8,184 9,977    
Allowance for Credit Losses After 5 to 10 years 0 0    
Fair value After 5 to 10 years $ 107,857 $ 112,571    
Weighted-average yield After 5 to 10 years 1.52% 1.52%    
Amortized cost After 10 years $ 912,039 $ 936,531    
Gross Unrealized Gains After 10 years 341 25    
Gross Unrealized Losses After 10 years 147,069 168,691    
Allowance for Credit Losses After 10 years 0 0    
Fair value After 10 years $ 765,311 $ 767,865    
Weighted-average yield After 10 years 1.52% 1.51%    
Amortized cost $ 1,040,961 $ 1,073,556    
Gross Unrealized Gains 341 25    
Gross Unrealized Losses 155,599 179,128    
Allowance for Credit Losses 0 0    
Fair value $ 885,703 $ 894,453    
Weighted-average yield 1.53% 1.52%    
Residential MBS [Member] | Ginnie Mae (GNMA) certificates [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost Due within one year $ 392 $ 881    
Gross Unrealized Gains Due within one year 0 0    
Gross Unrealized Losses Due within one year 2 6    
Allowance for Credit Losses within one year 0 0    
Fair value Due within one year $ 390 $ 875    
Weighted-average yield Due within one year 2.46% 2.68%    
Amortized cost After 1 to 5 years $ 6,889 $ 8,025    
Gross Unrealized Gains After 1 to 5 years 0 0    
Gross Unrealized Losses After 1 to 5 years 267 350    
Allowance for Credit Losses After 1 to 5 years 0 0    
Fair value After 1 to 5 years $ 6,622 $ 7,675    
Weighted-average yield After 1 to 5 years 0.72% 0.71%    
Amortized cost After 5 to 10 years $ 64,042 $ 67,181    
Gross Unrealized Gains After 5 to 10 years 3 0    
Gross Unrealized Losses After 5 to 10 years 5,001 6,125    
Allowance for Credit Losses After 5 to 10 years 0 0    
Fair value After 5 to 10 years $ 59,044 $ 61,056    
Weighted-average yield After 5 to 10 years 1.84% 1.86%    
Amortized cost After 10 years $ 139,482 $ 142,330    
Gross Unrealized Gains After 10 years 49 16    
Gross Unrealized Losses After 10 years 19,576 22,041    
Allowance for Credit Losses After 10 years 0 0    
Fair value After 10 years $ 119,955 $ 120,305    
Weighted-average yield After 10 years 2.78% 2.78%    
Amortized cost $ 210,805 $ 218,417    
Gross Unrealized Gains 52 16    
Gross Unrealized Losses 24,846 28,522    
Allowance for Credit Losses 0 0    
Fair value $ 186,011 $ 189,911    
Weighted-average yield 2.43% 2.42%    
Residential MBS [Member] | Fannie Mae (FNMA) certificates [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost After 1 to 5 years $ 19,453 $ 21,921    
Gross Unrealized Gains After 1 to 5 years 0 0    
Gross Unrealized Losses After 1 to 5 years 521 689    
Allowance for Credit Losses After 1 to 5 years 0 0    
Fair value After 1 to 5 years $ 18,932 $ 21,232    
Weighted-average yield After 1 to 5 years 2.13% 2.13%    
Amortized cost After 5 to 10 years $ 232,359 $ 244,966    
Gross Unrealized Gains After 5 to 10 years 8 0    
Gross Unrealized Losses After 5 to 10 years 15,249 18,874    
Allowance for Credit Losses After 5 to 10 years 0 0    
Fair value After 5 to 10 years $ 217,118 $ 226,092    
Weighted-average yield After 5 to 10 years 1.75% 1.74%    
Amortized cost After 10 years $ 950,195 $ 979,366    
Gross Unrealized Gains After 10 years 432 16    
Gross Unrealized Losses After 10 years 135,749 159,560    
Allowance for Credit Losses After 10 years 0 0    
Fair value After 10 years $ 814,878 $ 819,822    
Weighted-average yield After 10 years 1.50% 1.51%    
Amortized cost $ 1,202,007 $ 1,246,253    
Gross Unrealized Gains 440 16    
Gross Unrealized Losses 151,519 179,123    
Allowance for Credit Losses 0 0    
Fair value $ 1,050,928 $ 1,067,146    
Weighted-average yield 1.56% 1.56%    
Residential MBS [Member] | Collateralized mortgage obligations ("CMOs") issued or guaranteed by FHLMC, FNMA and GNMA [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost After 10 years $ 361,783 $ 377,812    
Gross Unrealized Gains After 10 years 624 74    
Gross Unrealized Losses After 10 years 47,198 52,338    
Allowance for Credit Losses After 10 years 0 0    
Fair value After 10 years $ 315,209 $ 325,548    
Weighted-average yield After 10 years 2.82% 2.88%    
Residential MBS [Member] | Private label [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost After 5 to 10 years $ 5,905 $ 4,886    
Gross Unrealized Gains After 5 to 10 years 0 0    
Gross Unrealized Losses After 5 to 10 years 1,695 1,430    
Allowance for Credit Losses After 5 to 10 years 176 57    
Fair value After 5 to 10 years $ 4,034 $ 3,399    
Weighted-average yield After 5 to 10 years 6.60% 6.69%    
Amortized cost After 10 years   $ 1,200    
Gross Unrealized Gains After 10 years   0    
Gross Unrealized Losses After 10 years   285    
Allowance for Credit Losses After 10 years   119    
Fair value After 10 years   $ 796    
Weighted-average yield After 10 years   6.32%    
Amortized cost   $ 6,086    
Gross Unrealized Gains   0    
Gross Unrealized Losses   1,715    
Allowance for Credit Losses $ 176 176 $ 116 $ 116
Fair value   $ 4,195    
Weighted-average yield   6.62%    
Commercial Mortgage Backed Securities [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost After 1 to 5 years 33,658 $ 33,835    
Gross Unrealized Gains After 1 to 5 years 13 13    
Gross Unrealized Losses After 1 to 5 years 1,893 2,286    
Allowance for Credit Losses After 1 to 5 years 0 0    
Fair value After 1 to 5 years $ 31,778 $ 31,562    
Weighted-average yield After 1 to 5 years 2.56% 2.59%    
Amortized cost After 5 to 10 years $ 10,549 $ 10,621    
Gross Unrealized Gains After 5 to 10 years 0 0    
Gross Unrealized Losses After 5 to 10 years 1,413 1,653    
Allowance for Credit Losses After 5 to 10 years 0 0    
Fair value After 5 to 10 years $ 9,136 $ 8,968    
Weighted-average yield After 5 to 10 years 1.67% 1.67%    
Amortized cost After 10 years $ 184,224 $ 178,537    
Gross Unrealized Gains After 10 years 88 0    
Gross Unrealized Losses After 10 years 34,809 37,158    
Allowance for Credit Losses After 10 years 0 0    
Fair value After 10 years $ 149,503 $ 141,379    
Weighted-average yield After 10 years 2.21% 2.06%    
Amortized cost $ 228,431 $ 222,993    
Gross Unrealized Gains 101 13    
Gross Unrealized Losses 38,115 41,097    
Allowance for Credit Losses 0 0    
Fair value $ 190,417 $ 181,909    
Weighted-average yield 2.23% 2.12%    
Mortgage Backed Securities [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost $ 3,049,892 $ 3,145,117    
Gross Unrealized Gains 1,558 144    
Gross Unrealized Losses 418,972 481,923    
Allowance for Credit Losses 176 176    
Fair value $ 2,632,302 $ 2,663,162    
Weighted-average yield 1.82% 1.82%    
Other Debt Obligations [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost Due within one year $ 1,000 $ 1,000    
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 $ 1,000    
Weighted-average yield Due within one year 2.31% 2.32%    
Uninsured Portion Of Government Deposits [Member] | Asset Pledged as Collateral [Member]        
Schedule Of Available For Sale Securities [Line Items]        
Amortized cost $ 3,100,000 $ 3,300,000    
Fair value $ 2,800,000 $ 3,000,000