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INVESTMENT SECURITIES - Investment Securities Available for Sale (Detail) - USD ($) | Sep. 30, 2021 | Dec. 31, 2020
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Schedule of Available-for-sale Securities [Line Items] |  |
Fair value | $ 6,689,479,000 | $ 4,647,019,000
Weighted-average yield | 1.04% | 1.28%
Gross Unrealized loss | $ 65,591,000 | $ 5,517,000
Gross Unrealized gain | 39,896,000 | 68,995,000
Amortized cost | 6,716,331,000 | 4,584,851,000
Allowance for Credit Losses | 1,157,000 | 1,310,000
U S Treasury Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost Due within one year |  | 7,498,000
Gross Unrealized gains Due within one year |  | 9,000
Gross Unrealized losses Due within one year |  | 0
Allowance for Credit Losses Within one year |  | 0
Fair value Due within one year |  | $ 7,507,000
Weighted-average yield Due within one year |  | 1.65%
Amortized cost After 1 to 5 years | 88,234,000 |
Gross Unrealized gains After 1 to 5 years | 0 |
Gross Unrealized losses After 1 to 5 years | 347,000 |
Allowance for Credit Losses After 1 to 5 years | 0 |
Fair value After 1 to 5 years | $ 87,887,000 |
Weighted-average yield After 1 to 5 years | 0.50% |
U.S. government-sponsored agencies obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost Due within one year |  | $ 24,413,000
Gross Unrealized gains Due within one year |  | 273,000
Gross Unrealized losses Due within one year |  | 0
Allowance for Credit Losses Within one year |  | 0
Fair value Due within one year |  | $ 24,686,000
Weighted-average yield Due within one year |  | 1.95%
Amortized cost After 1 to 5 years | $ 1,771,629,000 | $ 691,668,000
Gross Unrealized gains After 1 to 5 years | 565,000 | 911,000
Gross Unrealized losses After 1 to 5 years | 7,896,000 | 290,000
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 1,764,298,000 | $ 692,289,000
Weighted-average yield After 1 to 5 years | 0.60% | 0.57%
Amortized cost After 5 to 10 years | $ 494,941,000 | $ 441,454,000
Gross Unrealized gains After 5 to 10 years | 268,000 | 821,000
Gross Unrealized losses After 5 to 10 years | 7,825,000 | 347,000
Fair value After 5 to 10 years | $ 487,384,000 | $ 441,928,000
Weighted-average yield After 5 to 10 years | 0.86% | 0.83%
Amortized cost After 10 years | $ 16,696,000 | $ 21,413,000
Gross Unrealized gains After 10 years | 243,000 | 0
Gross Unrealized losses After 10 years | 0 | 149,000
Allowance for Credit Losses After 10 years | 0 | 0
Fair value After 10 years | $ 16,939,000 | $ 21,264,000
Weighted-average yield After 10 years | 0.63% | 0.65%
Allowance for Credit Losses After 5 to 10 years | $ 0 | $ 0
Puerto Rico Government obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost After 10 years | 3,680,000 | 3,987,000
Gross Unrealized gains After 10 years | 0 | 0
Gross Unrealized losses After 10 years | 478,000 | 780,000
Allowance for Credit Losses After 10 years | 308,000 | 308,000
Fair value After 10 years | $ 2,894,000 | $ 2,899,000
Weighted-average yield After 10 years | 0.00% | 6.97%
United States And Puerto Rico Government Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value | $ 2,359,402,000 | $ 1,190,573,000
Weighted-average yield | 0.66% | 0.72%
Gross Unrealized loss | $ 16,546,000 | $ 1,566,000
Gross Unrealized gain | 1,076,000 | 2,014,000
Amortized cost | 2,375,180,000 | 1,190,433,000
Allowance for Credit Losses | 308,000 | 308,000
Mortgage Backed Securities [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Fair value | $ 4,329,077,000 | $ 3,455,796,000
Weighted-average yield | 1.24% | 1.47%
Gross Unrealized loss | $ 49,045,000 | $ 3,951,000
Gross Unrealized gain | 38,820,000 | 66,981,000
Amortized cost | 4,340,151,000 | 3,393,768,000
Allowance for Credit Losses | 849,000 | 1,002,000
Mortgage Backed Securities [Member] | FHLMC [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost After 1 to 5 years | 1,507,000 | 75,000
Gross Unrealized gains After 1 to 5 years | 69,000 | 8,000
Gross Unrealized losses After 1 to 5 years | 0 | 0
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 1,576,000 | $ 83,000
Weighted-average yield After 1 to 5 years | 2.25% | 4.86%
Amortized cost After 5 to 10 years | $ 133,601,000 | $ 60,773,000
Gross Unrealized gains After 5 to 10 years | 3,023,000 | 2,850,000
Gross Unrealized losses After 5 to 10 years | 232,000 | 0
Fair value After 5 to 10 years | $ 136,392,000 | $ 63,623,000
Weighted-average yield After 5 to 10 years | 1.57% | 2.15%
Amortized cost After 10 years | $ 1,364,820,000 | $ 1,070,984,000
Gross Unrealized gains After 10 years | 5,902,000 | 15,340,000
Gross Unrealized losses After 10 years | 20,123,000 | 159,000
Allowance for Credit Losses After 10 years | 0 | 0
Fair value After 10 years | $ 1,350,599,000 | $ 1,086,165,000
Weighted-average yield After 10 years | 1.15% | 1.38%
Fair value | $ 1,488,567,000 | $ 1,149,871,000
Weighted-average yield | 1.18% | 1.42%
Gross Unrealized loss | $ 20,355,000 | $ 159,000
Gross Unrealized gain | 8,994,000 | 18,198,000
Amortized cost | 1,499,928,000 | 1,131,832,000
Allowance for Credit Losses After 5 to 10 years | 0 | 0
Allowance for Credit Losses | 0 | 0
Mortgage Backed Securities [Member] | GNMA [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost Due within one year | 3,000 | 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 | $ 3,000 | $ 1,000
Weighted-average yield Due within one year | 1.79% | 1.93%
Amortized cost After 1 to 5 years | $ 18,823,000 | $ 26,918,000
Gross Unrealized gains After 1 to 5 years | 772,000 | 1,080,000
Gross Unrealized losses After 1 to 5 years | 0 | 0
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 19,595,000 | $ 27,998,000
Weighted-average yield After 1 to 5 years | 2.91% | 2.91%
Amortized cost After 5 to 10 years | $ 30,149,000 | $ 40,727,000
Gross Unrealized gains After 5 to 10 years | 158,000 | 128,000
Gross Unrealized losses After 5 to 10 years | 119,000 | 69,000
Fair value After 5 to 10 years | $ 30,188,000 | $ 40,786,000
Weighted-average yield After 5 to 10 years | 0.49% | 0.42%
Amortized cost After 10 years | $ 380,890,000 | $ 614,584,000
Gross Unrealized gains After 10 years | 9,941,000 | 16,271,000
Gross Unrealized losses After 10 years | 1,454,000 | 148,000
Allowance for Credit Losses After 10 years | 0 | 0
Fair value After 10 years | $ 389,377,000 | $ 630,707,000
Weighted-average yield After 10 years | 1.35% | 1.27%
Fair value | $ 439,163,000 | $ 699,492,000
Weighted-average yield | 1.36% | 1.29%
Gross Unrealized loss | $ 1,573,000 | $ 217,000
Gross Unrealized gain | 10,871,000 | 17,479,000
Amortized cost | 429,865,000 | 682,230,000
Allowance for Credit Losses After 5 to 10 years | 0 | 0
Allowance for Credit Losses | 0 | 0
Mortgage Backed Securities [Member] | FNMA [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost Due within one year | 5,014,000 |
Gross Unrealized gains Due within one year | 40,000 |
Gross Unrealized losses Due within one year | 0 |
Allowance for Credit Losses Within one year | 0 |
Fair value Due within one year | $ 5,054,000 |
Weighted-average yield Due within one year | 2.07% |
Amortized cost After 1 to 5 years | $ 21,646,000 | 24,812,000
Gross Unrealized gains After 1 to 5 years | 559,000 | 891,000
Gross Unrealized losses After 1 to 5 years | 0 | 0
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 22,205,000 | $ 25,703,000
Weighted-average yield After 1 to 5 years | 2.85% | 2.81%
Amortized cost After 5 to 10 years | $ 239,743,000 | $ 110,832,000
Gross Unrealized gains After 5 to 10 years | 4,515,000 | 5,783,000
Gross Unrealized losses After 5 to 10 years | 528,000 | 0
Fair value After 5 to 10 years | $ 243,730,000 | $ 116,615,000
Weighted-average yield After 5 to 10 years | 1.43% | 2.13%
Amortized cost After 10 years | $ 1,547,907,000 | $ 1,154,707,000
Gross Unrealized gains After 10 years | 13,111,000 | 23,459,000
Gross Unrealized losses After 10 years | 17,854,000 | 203,000
Allowance for Credit Losses After 10 years | 0 | 0
Fair value After 10 years | $ 1,543,164,000 | $ 1,177,963,000
Weighted-average yield After 10 years | 1.22% | 1.53%
Fair value | $ 1,814,153,000 | $ 1,320,281,000
Weighted-average yield | 1.27% | 1.61%
Gross Unrealized loss | $ 18,382,000 | $ 203,000
Gross Unrealized gain | 18,225,000 | 30,133,000
Amortized cost | 1,814,310,000 | 1,290,351,000
Allowance for Credit Losses After 5 to 10 years | 0 | 0
Allowance for Credit Losses | 0 | 0
Mortgage Backed Securities [Member] | Collateralized mortgage obligations guaranteed by the FHLMC, FNMA and GNMA [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost After 1 to 5 years | 272,000 | 538,000
Gross Unrealized gains After 1 to 5 years | 0 | 0
Gross Unrealized losses After 1 to 5 years | 0 | 1,000
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 272,000 | $ 537,000
Weighted-average yield After 1 to 5 years | 0.75% | 0.81%
Amortized cost After 5 to 10 years | $ 40,202,000 | $ 18,438,000
Gross Unrealized gains After 5 to 10 years | 114,000 | 152,000
Gross Unrealized losses After 5 to 10 years | 494,000 | 0
Fair value After 5 to 10 years | $ 39,822,000 | $ 18,590,000
Weighted-average yield After 5 to 10 years | 1.09% | 0.80%
Amortized cost After 10 years | $ 544,865,000 | $ 258,069,000
Gross Unrealized gains After 10 years | 616,000 | 1,019,000
Gross Unrealized losses After 10 years | 5,955,000 | 491,000
Allowance for Credit Losses After 10 years | 0 | 0
Fair value After 10 years | $ 539,526,000 | $ 258,597,000
Weighted-average yield After 10 years | 1.20% | 1.56%
Fair value | $ 579,620,000 | $ 277,724,000
Weighted-average yield | 1.19% | 1.51%
Gross Unrealized loss | $ 6,449,000 | $ 492,000
Gross Unrealized gain | 730,000 | 1,171,000
Amortized cost | 585,339,000 | 277,045,000
Allowance for Credit Losses After 5 to 10 years | 0 | 0
Allowance for Credit Losses | 0 | 0
Mortgage Backed Securities [Member] | Private label [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost After 10 years | 10,709,000 | 12,310,000
Gross Unrealized gains After 10 years | 0 | 0
Gross Unrealized losses After 10 years | 2,286,000 | 2,880,000
Allowance for Credit Losses After 10 years | 849,000 | 1,002,000
Fair value After 10 years | $ 7,574,000 | $ 8,428,000
Weighted-average yield After 10 years | 2.12% | 2.25%
Fair value | $ 7,600,000 |
Weighted-average yield | 2.12% |
Gross Unrealized loss | $ 3,100,000 |
Allowance for Credit Losses | 800,000 | $ 1,000,000.0
Other Debt Obligations [Member] |  |
Schedule of Available-for-sale Securities [Line Items] |  |
Amortized cost Due within one year | 500,000 |
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 | $ 500,000 |
Weighted-average yield Due within one year | 0.72% |
Amortized cost After 1 to 5 years | $ 500,000 | 650,000
Gross Unrealized gains After 1 to 5 years | 0 | 0
Gross Unrealized losses After 1 to 5 years | 0 | 0
Allowance for Credit Losses After 1 to 5 years | 0 | 0
Fair value After 1 to 5 years | $ 500,000 | $ 650,000
Weighted-average yield After 1 to 5 years | 0.84% | 2.94%
Fair value | $ 1,000,000 |
Weighted-average yield | 0.78% |
Gross Unrealized loss | $ 0 |
Gross Unrealized gain | 0 |
Amortized cost | 1,000,000 |
Allowance for Credit Losses | $ 0 |

X
- Definition Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. This represents single maturity date and allocated without single maturity date, maturing in sixth fiscal year through tenth fiscal year following latest fiscal year. Excludes interim and annual periods when interim period is reported on rolling approach, from latest statement of financial position date. + References No definition available. + Details
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