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INVESTMENT SECURITIES (Tables) | 9 Months Ended
--- | ---
Sep. 30, 2021
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block] |
The tables below present qualitative information for significant assets and liabilities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) as of September 30, 2021 and December 31, 2020: |  |
|  | September 30, 2021 |  |
|  | Fair Value |  | Valuation Technique |  | Unobservable Input |  | Range |  | Weighted Average
(Dollars in thousands) |  |  |  | Minimum | Maximum |
Investment securities available-for-sale:
| Private label MBS | $ | 7,574 |  | Discounted cash flows |  | Discount rate |  | 12.7% | 12.7% |  | 12.7%
|  |  |  |  |  |  | Prepayment rate |  | 4.8% | 24.1% |  | 15.8%
|  |  |  |  |  |  | Projected cumulative loss rate |  | 0.2% | 18.6% |  | 9.6%
| Puerto Rico government obligations |  | 2,894 |  | Discounted cash flows |  | Discount rate |  | 6.7% | 6.7% |  | 6.7%
|  |  |  |  |  |  | Projected cumulative loss rate |  | 10.7% | 10.7% |  | 10.7%
|  | December 31, 2020 |  |
|  | Fair Value |  | Valuation Technique |  | Unobservable Input |  | Range |  | Weighted Average
(Dollars in thousands) |  |  |  | Minimum | Maximum |
Investment securities available-for-sale:
| Private label MBS | $ | 8,428 |  | Discounted cash flows |  | Discount rate |  | 12.2% | 12.2% |  | 12.2%
|  |  |  |  |  |  | Prepayment rate |  | 1.2% | 18.8% |  | 12.1%
|  |  |  |  |  |  | Projected cumulative loss rate |  | 2.6% | 22.3% |  | 10.2%
| Puerto Rico government obligations |  | 2,899 |  | Discounted cash flows |  | Discount rate |  | 7.9% | 7.9% |  | 7.9%
|  |  |  |  |  |  | Projected cumulative loss rate |  | 12.4% | 12.4% |  | 12.4%
Debt Securities, Available-for-sale, Allowance for Credit Loss [Table Text Block] | The following table presents a rollforward by major security type for the quarters and nine-month periods ended September 30, 2021 and 2020 of the ACL on debt securities available-for-sale:
| Quarter Ended September 30, 2021
| Private label MBS |  | Puerto Rico Government Obligations |  | Total
(In thousands) |  |  |  |  |  |  |  |
Beginning Balance | $ | 858 |  | $ | 308 |  | $ | 1,166
Provision for credit losses - (benefit) |  | (9) |  |  | - |  |  | (9)
ACL on debt securities available-for-sale | $ | 849 |  | $ | 308 |  | $ | 1,157
| Quarter Ended September 30, 2020
| Private label MBS |  | Puerto Rico Government Obligations |  | Total
(In thousands) |  |  |  |  |  |  |  |
Beginning Balance | $ | 1,323 |  | $ | 308 |  | $ | 1,631
Net charge-offs |  | (245) |  |  | - |  |  | (245)
ACL on debt securities available-for-sale | $ | 1,078 |  | $ | 308 |  | $ | 1,386
| Nine-Month Period Ended September 30, 2021
| Private label MBS |  | Puerto Rico Government Obligations |  | Total
(In thousands) |  |  |  |  |  |  |  |
Beginning Balance | $ | 1,002 |  | $ | 308 |  | $ | 1,310
Provision for credit losses - (benefit) |  | (136) |  |  | - |  |  | (136)
Net charge-offs |  | (17) |  |  | - |  |  | (17)
ACL on debt securities available-for-sale | $ | 849 |  | $ | 308 |  | $ | 1,157
| Nine-Month Period Ended September 30, 2020
| Private label MBS |  | Puerto Rico Government Obligations |  | Total
(In thousands) |  |  |  |  |  |  |  |
Beginning Balance | $ | - |  | $ | - |  | $ | -
Provision for credit losses |  | 1,323 |  |  | 308 |  |  | 1,631
Net charge-offs |  | (245) |  |  | - |  |  | (245)
ACL on debt securities available-for-sale | $ | 1,078 |  | $ | 308 |  | $ | 1,386
Debt Securities, Held-to-maturity, Allowance for Credit Loss [Table Text Block] | The following table presents the activity in the ACL for debt securities held to maturity by major security type for the quarters and nine-month periods ended September 30, 2021 and 2020:
|  | Puerto Rico Municipal Bonds
|  | Quarter Ended |  | Quarter Ended
|  | September 30, 2021 |  | September 30, 2020
(In thousands) |  |  |  |  |
Beginning Balance | $ | 10,685 |  | $ | 9,268
Initial allowance on purchases with credit deterioration |  |  |  |  |
| ("PCD") debt securities |  | - |  |  | 1,269
Provision for credit losses - (benefit) |  | (2,368) |  |  | (361)
|  | $ | 8,317 |  | $ | 10,176
|  | Puerto Rico Municipal Bonds
|  | Nine-Month Period Ended |  | Nine-Month Period Ended
|  | September 30, 2021 |  | September 30, 2020
(In thousands) |  |  |  |  |
Beginning Balance | $ | 8,845 |  | $ | -
Impact of adopting CECL |  | - |  |  | 8,134
Initial allowance on purchases with credit deterioration |  |  |  |  |
| ("PCD") debt securities |  | - |  |  | 1,269
Provision for credit losses - (benefit) expense |  | (528) |  |  | 773
|  | $ | 8,317 |  | $ | 10,176
Debt Securities, Held-to-maturity, Credit Quality Indicator [Table Text Block] | The following table summarizes the amortized cost of the Puerto Rico municipal bonds, which are the Corporation’s only debt securities held-to-maturity, as of September 30, 2021 and December 31, 2020 aggregated by credit quality indicator:
|  | Held to Maturity
|  | Puerto Rico Municipal Bonds
|  | September 30, |  | December 31
(In thousands) |  | 2021 |  | 2020
Risk Ratings: |  |  |  |  |  |
Pass |  | $ | 177,805 |  | $ | 189,488
Criticized: |  |  |  |  |  |
Special Mention |  |  | - |  |  | -
Substandard |  |  | - |  |  | -
Doubtful |  |  | - |  |  | -
Loss |  |  | - |  |  | -
Total |  | $ | 177,805 |  | $ | 189,488
Available-for-sale Securities [Member] |
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |
Investments Classified by Contractual Maturity Date [Table Text Block] | The amortized cost, gross unrealized gains and losses recorded in other comprehensive (loss) income, ACL, estimated fair value, and weighted-average yield of investment securities available for sale by contractual maturities as of September 30, 2021 were as follows:
|  |  | September 30, 2021
|  |  | Amortized cost |  |  |  | ACL |  | Fair value |  |
|  | Gross Unrealized |  |  |  | Weighted-
|  |  |  | gains |  | losses |  |  |  | average yield%
(Dollars in thousands) |
U.S. Treasury securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 1 to 5 years | $ | 88,234 |  | $ | - |  | $ | 347 |  | $ | - |  | $ | 87,887 |  | 0.50
U.S. government-sponsored |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| agencies' obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 1 to 5 years |  | 1,771,629 |  |  | 565 |  |  | 7,896 |  |  | - |  |  | 1,764,298 |  | 0.60
| After 5 to 10 years |  | 494,941 |  |  | 268 |  |  | 7,825 |  |  | - |  |  | 487,384 |  | 0.86
| After 10 years |  | 16,696 |  |  | 243 |  |  | - |  |  | - |  |  | 16,939 |  | 0.63
Puerto Rico government obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 10 years (1) |  | 3,680 |  |  | - |  |  | 478 |  |  | 308 |  |  | 2,894 |  | -
United States and Puerto Rico |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| government obligations |  | 2,375,180 |  |  | 1,076 |  |  | 16,546 |  |  | 308 |  |  | 2,359,402 |  | 0.66
Mortgage-backed securities ("MBS"): |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Freddie Mac (“FHLMC”) certificates: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 1 to 5 years |  | 1,507 |  |  | 69 |  |  | - |  |  | - |  |  | 1,576 |  | 2.25
| After 5 to 10 years |  | 133,601 |  |  | 3,023 |  |  | 232 |  |  | - |  |  | 136,392 |  | 1.57
| After 10 years |  | 1,364,820 |  |  | 5,902 |  |  | 20,123 |  |  | - |  |  | 1,350,599 |  | 1.15
|  |  |  | 1,499,928 |  |  | 8,994 |  |  | 20,355 |  |  | - |  |  | 1,488,567 |  | 1.18
Ginnie Mae (“GNMA”) certificates: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Due within one year |  | 3 |  |  | - |  |  | - |  |  | - |  |  | 3 |  | 1.79
| After 1 to 5 years |  | 18,823 |  |  | 772 |  |  | - |  |  | - |  |  | 19,595 |  | 2.91
| After 5 to 10 years |  | 30,149 |  |  | 158 |  |  | 119 |  |  | - |  |  | 30,188 |  | 0.49
| After 10 years |  | 380,890 |  |  | 9,941 |  |  | 1,454 |  |  | - |  |  | 389,377 |  | 1.35
|  |  |  | 429,865 |  |  | 10,871 |  |  | 1,573 |  |  | - |  |  | 439,163 |  | 1.36
Fannie Mae (“FNMA”) certificates: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Due within one year |  | 5,014 |  |  | 40 |  |  | - |  |  | - |  |  | 5,054 |  | 2.07
| After 1 to 5 years |  | 21,646 |  |  | 559 |  |  | - |  |  | - |  |  | 22,205 |  | 2.85
| After 5 to 10 years |  | 239,743 |  |  | 4,515 |  |  | 528 |  |  | - |  |  | 243,730 |  | 1.43
| After 10 years |  | 1,547,907 |  |  | 13,111 |  |  | 17,854 |  |  | - |  |  | 1,543,164 |  | 1.22
|  | 1,814,310 |  |  | 18,225 |  |  | 18,382 |  |  | - |  |  | 1,814,153 |  | 1.27
Collateralized mortgage obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| issued or guaranteed by the FHLMC, |  |  |  |  | ` |  |  |  |  |  |  |  |  |  |  |
| FNMA and GNMA: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 1 to 5 years |  | 272 |  |  | - |  |  | - |  |  | - |  |  | 272 |  | 0.75
| After 5 to 10 years |  | 40,202 |  |  | 114 |  |  | 494 |  |  | - |  |  | 39,822 |  | 1.09
| After 10 years |  | 544,865 |  |  | 616 |  |  | 5,955 |  |  | - |  |  | 539,526 |  | 1.20
|  |  |  | 585,339 |  |  | 730 |  |  | 6,449 |  |  | - |  |  | 579,620 |  | 1.19
Private label: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 10 years |  | 10,709 |  |  | - |  |  | 2,286 |  |  | 849 |  |  | 7,574 |  | 2.12
Total MBS |  | 4,340,151 |  |  | 38,820 |  |  | 49,045 |  |  | 849 |  |  | 4,329,077 |  | 1.24
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Due within one year |  | 500 |  |  | - |  |  | - |  |  | - |  |  | 500 |  | 0.72
| After 1 to 5 years |  | 500 |  |  | - |  |  | - |  |  | - |  |  | 500 |  | 0.84
|  |  | 1,000 |  |  | - |  |  | - |  |  | - |  |  | 1,000 |  | 0.78
Total investment securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| available for sale | $ | 6,716,331 |  | $ | 39,896 |  | $ | 65,591 |  | $ | 1,157 |  | $ | 6,689,479 |  | 1.04
(1) | Consist of a residential pass-through MBS issued by the Puerto Rico Housing Finance Authority (“PRHFA”) that is collateralized by certain second mortgages originated under a program launched by the Puerto Rico government in 2010. During the second quarter of 2021, the Corporation placed this instrument in nonaccrual status based on the delinquency status of the underlying second mortgage loans collateral.
The amortized cost, gross unrealized gains and losses recorded in other comprehensive income (loss), ACL, estimated fair value, and weighted-average yield of investment securities available for sale by contractual maturities as of December 31, 2020 were as follows:
|  |  | December 31, 2020
|  |  | Amortized cost |  | Gross Unrealized |  | ACL |  | Fair value |  |
|  |  |  |  |  |  | Weighted-
|  |  |  | gains |  | losses |  |  |  | average yield%
(Dollars in thousands)
U.S. Treasury securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Due within one year | $ | 7,498 |  | $ | 9 |  | $ | - |  | $ | - |  | $ | 7,507 |  | 1.65
U.S. government-sponsored |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| agencies' obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Due within one year |  | 24,413 |  |  | 273 |  |  | - |  |  | - |  |  | 24,686 |  | 1.95
| After 1 to 5 years |  | 691,668 |  |  | 911 |  |  | 290 |  |  | - |  |  | 692,289 |  | 0.57
| After 5 to 10 years |  | 441,454 |  |  | 821 |  |  | 347 |  |  | - |  |  | 441,928 |  | 0.83
| After 10 years |  | 21,413 |  |  | - |  |  | 149 |  |  | - |  |  | 21,264 |  | 0.65
Puerto Rico government obligations: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 10 years (1) |  | 3,987 |  |  | - |  |  | 780 |  |  | 308 |  |  | 2,899 |  | 6.97
United States and Puerto Rico |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| government obligations |  | 1,190,433 |  |  | 2,014 |  |  | 1,566 |  |  | 308 |  |  | 1,190,573 |  | 0.72
MBS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FHLMC certificates: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 1 to 5 years |  | 75 |  |  | 8 |  |  | - |  |  | - |  |  | 83 |  | 4.86
| After 5 to 10 years |  | 60,773 |  |  | 2,850 |  |  | - |  |  | - |  |  | 63,623 |  | 2.15
| After 10 years |  | 1,070,984 |  |  | 15,340 |  |  | 159 |  |  | - |  |  | 1,086,165 |  | 1.38
|  |  |  | 1,131,832 |  |  | 18,198 |  |  | 159 |  |  | - |  |  | 1,149,871 |  | 1.42
GNMA certificates: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Due within one year |  | 1 |  |  | - |  |  | - |  |  | - |  |  | 1 |  | 1.93
| After 1 to 5 years |  | 26,918 |  |  | 1,080 |  |  | - |  |  | - |  |  | 27,998 |  | 2.91
| After 5 to 10 years |  | 40,727 |  |  | 128 |  |  | 69 |  |  | - |  |  | 40,786 |  | 0.42
| After 10 years |  | 614,584 |  |  | 16,271 |  |  | 148 |  |  | - |  |  | 630,707 |  | 1.27
|  |  |  | 682,230 |  |  | 17,479 |  |  | 217 |  |  | - |  |  | 699,492 |  | 1.29
FNMA certificates: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 1 to 5 years |  | 24,812 |  |  | 891 |  |  | - |  |  | - |  |  | 25,703 |  | 2.81
| After 5 to 10 years |  | 110,832 |  |  | 5,783 |  |  | - |  |  | - |  |  | 116,615 |  | 2.13
| After 10 years |  | 1,154,707 |  |  | 23,459 |  |  | 203 |  |  | - |  |  | 1,177,963 |  | 1.53
|  |  |  | 1,290,351 |  |  | 30,133 |  |  | 203 |  |  | - |  |  | 1,320,281 |  | 1.61
Collateralized mortgage obligations issued or |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| guaranteed by the FHLMC, FNMA |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| and GNMA: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 1 to 5 years |  | 538 |  |  | - |  |  | 1 |  |  | - |  |  | 537 |  | 0.81
| After 5 to 10 years |  | 18,438 |  |  | 152 |  |  | - |  |  | - |  |  | 18,590 |  | 0.80
| After 10 years |  | 258,069 |  |  | 1,019 |  |  | 491 |  |  | - |  |  | 258,597 |  | 1.56
|  |  |  | 277,045 |  |  | 1,171 |  |  | 492 |  |  | - |  |  | 277,724 |  | 1.51
Private label: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 10 years |  | 12,310 |  |  | - |  |  | 2,880 |  |  | 1,002 |  |  | 8,428 |  | 2.25
Total MBS |  | 3,393,768 |  |  | 66,981 |  |  | 3,951 |  |  | 1,002 |  |  | 3,455,796 |  | 1.47
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| After 1 to 5 years |  | 650 |  |  | - |  |  | - |  |  | - |  |  | 650 |  | 2.94
Total investment securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| available for sale | $ | 4,584,851 |  | $ | 68,995 |  | $ | 5,517 |  | $ | 1,310 |  | $ | 4,647,019 |  | 1.28
(1) | Consist of a residential pass-through MBS issued by the PRHFA that is collateralized by certain second mortgages originated under a program launched by the Puerto Rico government in 2010.
Schedule Of Unrealized Loss On Investments [Table Text Block] | The following tables show the fair value and gross unrealized losses of the Corporation’s available-for-sale investment securities, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, as of September 30, 2021 and December 31, 2020. The tables also include debt securities for which an ACL was recorded.
|  | As of September 30, 2021
|  | Less than 12 months |  | 12 months or more |  | Total
|  |  |  | Unrealized |  |  |  | Unrealized |  |  |  | Unrealized
|  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses
(In thousands) |  |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Puerto Rico-government obligations | $ | - |  | $ | - |  | $ | 2,894 |  | $ | 478 |  | $ | 2,894 |  | $ | 478
U.S. Treasury and U.S. government |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
agenciesʼ obligations |  | 2,018,246 |  |  | 15,805 |  |  | 47,550 |  |  | 263 |  |  | 2,065,796 |  |  | 16,068
MBS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FNMA |  | 1,384,133 |  |  | 18,063 |  |  | 10,582 |  |  | 319 |  |  | 1,394,715 |  |  | 18,382
FHLMC |  | 1,130,514 |  |  | 20,355 |  |  | - |  |  | - |  |  | 1,130,514 |  |  | 20,355
GNMA |  | 108,272 |  |  | 1,573 |  |  | - |  |  | - |  |  | 108,272 |  |  | 1,573
Collateralized mortgage obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
issued or guaranteed by the |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FHLMC, FNMA and GNMA |  | 427,088 |  |  | 6,052 |  |  | 21,102 |  |  | 397 |  |  | 448,190 |  |  | 6,449
Private label MBS |  | - |  |  | - |  |  | 7,574 |  |  | 2,286 |  |  | 7,574 |  |  | 2,286
|  | $ | 5,068,253 |  | $ | 61,848 |  | $ | 89,702 |  | $ | 3,743 |  | $ | 5,157,955 |  | $ | 65,591
|  | As of December 31, 2020
|  | Less than 12 months |  | 12 months or more |  | Total
|  |  |  | Unrealized |  |  |  | Unrealized |  |  |  | Unrealized
|  | Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses
(In thousands) |  |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Puerto Rico-government obligations | $ | - |  | $ | - |  | $ | 2,899 |  | $ | 780 |  | $ | 2,899 |  | $ | 780
U.S. Treasury and U.S. government |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
agenciesʼ obligations |  | 425,155 |  |  | 621 |  |  | 23,377 |  |  | 165 |  |  | 448,532 |  |  | 786
MBS: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FNMA |  | 93,509 |  |  | 203 |  |  | - |  |  | - |  |  | 93,509 |  |  | 203
FHLMC |  | 89,292 |  |  | 159 |  |  | - |  |  | - |  |  | 89,292 |  |  | 159
GNMA |  | 70,504 |  |  | 217 |  |  | - |  |  | - |  |  | 70,504 |  |  | 217
Collateralized mortgage obligations |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
issued or guaranteed by the |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
FHLMC, FNMA and GNMA |  | 104,500 |  |  | 410 |  |  | 9,761 |  |  | 82 |  |  | 114,261 |  |  | 492
Private label MBS |  | - |  |  | - |  |  | 8,428 |  |  | 2,880 |  |  | 8,428 |  |  | 2,880
| $ | 782,960 |  | $ | 1,610 |  | $ | 44,465 |  | $ | 3,907 |  | $ | 827,425 |  | $ | 5,517
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Table Text Block] | The Corporation determined the ACL for private label MBS based on a risk-adjusted discounted cash flow methodology that considers the structure and terms of the instruments. The Corporation utilized probability of default (“PDs”) and loss given default (“LGDs”) that considered, among other things, historical payment performance, loan-to-value attributes and relevant current and forward-looking macroeconomic variables, such as regional unemployment rates and the housing price index. Under this approach, all future cash flows (interest and principal) from the underlying collateral loans, adjusted by prepayments and the PDs and LGDs, were discounted at the effective interest rate as of the reporting date. Significant assumptions in the valuation of the private label MBS were as follows:
| As of |  | As of
| September 30, 2021 |  | December 31, 2020
| Weighted |  | Range |  | Weighted |  | Range
| Average |  | Minimum |  | Maximum |  | Average |  | Minimum |  | Maximum
Discount rate | 12.7% |  | 12.7% |  | 12.7% |  | 12.2% |  | 12.2% |  | 12.2%
Prepayment rate | 15.8% |  | 4.8% |  | 24.1% |  | 12.1% |  | 1.2% |  | 18.8%
Projected Cumulative Loss Rate | 9.6% |  | 0.2% |  | 18.6% |  | 10.2% |  | 2.6% |  | 22.3%
Held-to-maturity Securities [Member] |
Other Than Temporary Impairment Credit Losses Recognized In Earnings [Line Items] |
Investments Classified by Contractual Maturity Date [Table Text Block] | The amortized cost, gross unrecognized gains and losses, estimated fair value, ACL, weighted-average yield and contractual maturities of investment securities held to maturity as of September 30, 2021 and December 31, 2020 were as follows:
|  | September 30, 2021
|  | Amortized cost |  |  |  |  | Fair value |  | ACL |  |
|  |  |  | Gross Unrecognized |  |  |  |
|  |  | Gains |  | Losses |  |  |  | Weighted- average yield%
(Dollars in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Puerto Rico municipal bonds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Due within one year | $ | 2,993 |  |  | $ | 8 |  | $ | 19 |  | $ | 2,982 |  | $ | 59 |  | 5.39
| After 1 to 5 years |  | 14,667 |  |  |  | 615 |  |  | 178 |  |  | 15,104 |  |  | 268 |  | 2.36
| After 5 to 10 years |  | 90,377 |  |  |  | 1,939 |  |  | 1,470 |  |  | 90,846 |  |  | 3,013 |  | 4.26
| After 10 years |  | 69,768 |  |  |  | - |  |  | 8,262 |  |  | 61,506 |  |  | 4,977 |  | 4.07
Total investment securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| held to maturity | $ | 177,805 |  |  | $ | 2,562 |  | $ | 9,929 |  | $ | 170,438 |  | $ | 8,317 |  | 4.05
|  | December 31, 2020
|  | Amortized cost |  |  |  | Fair value |  | ACL |  |
|  |  | Gross Unrecognized |  |  |  |
|  | Gains |  | Losses |  |  |  | Weighted- average yield%
(Dollars in thousands) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Puerto Rico municipal bonds: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| Due within one year | $ | 556 |  | $ | 7 |  | $ | - |  | $ | 563 |  | $ | - |  | 5.41
| After 1 to 5 years |  | 17,297 |  |  | 561 |  |  | 305 |  |  | 17,553 |  |  | 576 |  | 3.00
| After 5 to 10 years |  | 88,394 |  |  | 1,388 |  |  | 3,146 |  |  | 86,636 |  |  | 4,401 |  | 4.66
| After 10 years |  | 83,241 |  |  | - |  |  | 14,187 |  |  | 69,054 |  |  | 3,868 |  | 3.57
Total investment securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
| held to maturity | $ | 189,488 |  | $ | 1,956 |  | $ | 17,638 |  | $ | 173,806 |  | $ | 8,845 |  | 4.03
Schedule Of Unrealized Loss On Investments [Table Text Block] | The following tables show the Corporation’s held-to-maturity investments’ fair value and gross unrecognized losses, aggregated by investment category and length of time that individual securities had been in a continuous unrecognized loss position, as of September 30, 2021 and December 31, 2020, including debt securities for which an ACL was recorded:
| As of September 30, 2021
| Less than 12 months |  | 12 months or more |  | Total
|  |  | Unrecognized |  |  |  | Unrecognized |  |  |  | Unrecognized
| Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses
(In thousands) |  |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Puerto Rico municipal bonds | $ | - |  | $ | - |  | $ | 117,787 |  | $ | 9,929 |  | $ | 117,787 |  | $ | 9,929
| As of December 31, 2020
| Less than 12 months |  | 12 months or more |  | Total
|  |  | Unrecognized |  |  |  | Unrecognized |  |  |  | Unrecognized
| Fair Value |  | Losses |  | Fair Value |  | Losses |  | Fair Value |  | Losses
(In thousands) |  |
Debt securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Puerto Rico municipal bonds | $ | 28,252 |  | $ | 1,611 |  | $ | 116,216 |  | $ | 16,027 |  | $ | 144,468 |  | $ | 17,638

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