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Debt Securities Held-to-maturity -Additional Information (Details) | Sep. 30, 2023 USD ($) score | Jun. 30, 2023 USD ($) | Dec. 31, 2022 USD ($) score | Sep. 30, 2022 USD ($) | Jun. 30, 2022 USD ($) | Dec. 31, 2021 USD ($)
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Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Held to maturity securities | $ 9,004,729,000 |  | $ 9,356,739,000 |  |  |
Allowance for credit losses | 6,057,000 |  | 6,911,000 |  |  |
Obligations of Puerto Rico, States and political subdivisions |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Held to maturity securities | 65,802,000 |  | 65,921,000 |  |  |
Allowance for credit losses | $ 6,057,000 | $ 6,145,000 | $ 6,911,000 | $ 7,210,000 | $ 7,495,000 | $ 8,096,000
Average Credit Score Fico | score | 709 |  | 707 |  |  |
Percentage of nominal value | 67.00% |  | 65.00% |  |  |
Obligations of Puerto Rico, States and political subdivisions | Munis Payable From Real and Personal Property Taxes |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Held to maturity securities | $ 18,820,000 |  | $ 24,660,000 |  |  |
Allowance for credit losses | 200,000 |  | 300,000 |  |  |
Obligations of Puerto Rico, States and political subdivisions | Munis Not Guaranteed By Puerto Rico Central Government |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Held to maturity securities | 40,000,000 |  | 42,000,000 |  |  |
Allowance for credit losses | 5,900,000 |  | 6,600,000 |  |  |
Obligations of Puerto Rico, States and political subdivisions | Munis payable from US treasure securities proceeds |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Held to maturity securities | 7,000,000 |  |  |  |  |
Allowance for credit losses | 0 |  |  |  |  |
Past due |  |  |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |  |  |
Held to maturity securities | $ 0 |  | $ 0 |  |  |

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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 https://asc.fasb.org/extlink&oid=124255953&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 https://asc.fasb.org/extlink&oid=126970911&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 https://asc.fasb.org/extlink&oid=124255206&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 https://asc.fasb.org/extlink&oid=124255953&loc=SL82919249-210447 + Details
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