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Debt Securities Held-to-maturity -Additional Information (Details) | Sep. 30, 2021 USD ($) score | Jun. 30, 2021 USD ($) | Dec. 31, 2020 USD ($) score | Sep. 30, 2020 USD ($) | Jun. 30, 2020 USD ($) | Dec. 31, 2019 USD ($)
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Debt Securities, Held-to-maturity |  |  |  |  |  |
Amortized cost | $ 85,655,000 |  | $ 92,621,000 |  |  |
Allowance for credit losses | 9,222,000 |  | 10,261,000 |  |  |
Securities in non-performing status | 0 |  | 0 |  |  |
Obligations of Puerto Rico, States and political subdivisions |  |  |  |  |  |
Debt Securities, Held-to-maturity |  |  |  |  |  |
Amortized cost | 74,064,000 |  | 81,029,000 |  |  |
Allowance for credit losses | $ 9,222,000 | $ 10,214,000 | $ 10,261,000 | $ 12,421,000 | $ 12,735,000 | $ 0
Average Credit Score Fico | score | 702 |  | 697 |  |  |
Percentage of nominal value | 66.00% |  | 66.00% |  |  |
Obligations of Puerto Rico, States and political subdivisions | Munis Payable From Real and Personal Property Taxes |  |  |  |  |  |
Debt Securities, Held-to-maturity |  |  |  |  |  |
Amortized cost | $ 30,145,000 |  | $ 35,315,000 |  |  |
Allowance for credit losses | 1,000,000.0 |  | 1,400,000 |  |  |
Obligations of Puerto Rico, States and political subdivisions | Munis Not Guaranteed By Puerto Rico Central Government |  |  |  |  |  |
Debt Securities, Held-to-maturity |  |  |  |  |  |
Amortized cost | 44,000,000 |  | 46,000,000 |  |  |
Allowance for credit losses | $ 8,200,000 |  | $ 8,900,000 |  |  |

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- Definition Amount of allowance for credit loss for debt security measured at amortized cost (held-to-maturity). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aaa) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=121599878&loc=SL82895884-210446 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 13 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919249-210447 + Details
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