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INVESTMENT SECURITIES - Available-For-Sale Investments' Fair Value And Gross Unrealized Losses (Detail) - USD ($)
$ in Thousands
Jun. 30, 2019
Dec. 31, 2018
Schedule of Available-for-sale Securities [Line Items]    
Fair Value Less than 12 months $ 3,095 $ 64,559
Unrealized Losses Less than 12 months 1 331
Fair Value 12 months or more 777,105 1,328,036
Unrealized Losses 12 months or more 14,226 39,591
Total Fair Value 780,200 1,392,595
Total Unrealized Losses 14,227 39,922
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 2,899 2,824
Unrealized Losses 12 months or more 1,399 1,361
Total Fair Value 2,899 2,824
Total Unrealized Losses 1,399 1,361
US Treasury and Government [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value Less than 12 months 0 16,669
Unrealized Losses Less than 12 months 0 77
Fair Value 12 months or more 293,853 468,094
Unrealized Losses 12 months or more 1,023 6,004
Total Fair Value 293,853 484,763
Total Unrealized Losses 1,023 6,081
Mortgage Backed Securities [Member] | FNMA [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value Less than 12 months 0 25,079
Unrealized Losses Less than 12 months 0 129
Fair Value 12 months or more 321,593 521,871
Unrealized Losses 12 months or more 4,393 17,048
Total Fair Value 321,593 546,950
Total Unrealized Losses 4,393 17,177
Mortgage Backed Securities [Member] | FHLMC [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value Less than 12 months 0 3,382
Unrealized Losses Less than 12 months 0 32
Fair Value 12 months or more 116,615 263,798
Unrealized Losses 12 months or more 1,832 8,517
Total Fair Value 116,615 267,180
Total Unrealized Losses 1,832 8,549
Mortgage Backed Securities [Member] | GNMA [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value Less than 12 months 0 3,364
Unrealized Losses Less than 12 months 0 15
Fair Value 12 months or more 29,638 57,535
Unrealized Losses 12 months or more 222 1,235
Total Fair Value 29,638 60,899
Total Unrealized Losses 222 1,250
Mortgage Backed Securities [Member] | Collateralized mortgage obligations guaranteed by the FHLMC and GNMA [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Fair Value Less than 12 months 3,095 16,065
Unrealized Losses Less than 12 months 1 78
Fair Value 12 months or more 0 0
Unrealized Losses 12 months or more 0 0
Total Fair Value 3,095 16,065
Total Unrealized Losses 1 78
Mortgage Backed Securities [Member] | Other-mortgage pass-through trust certificates [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 12,507 13,914
Unrealized Losses 12 months or more 5,357 5,426
Total Fair Value 12,507 13,914
Total Unrealized Losses $ 5,357 $ 5,426