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Debt Securities Held-to-maturity -Additional Information (Details) | Mar. 31, 2024 USD ($) score | Dec. 31, 2023 USD ($) score | Mar. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
--- | --- | --- | --- | ---
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Held to maturity securities | $ 8,697,641,000 | $ 8,852,825,000 |  |
Allowance for credit losses | 5,731,000 | 5,780,000 |  |
Obligations of Puerto Rico, States and political subdivisions |  |  |  |
Schedule of Held-to-maturity Securities [Line Items] |  |  |  |
Held to maturity securities | 61,712,000 | 65,408,000 |  |
Allowance for credit losses | $ 5,731,000 | $ 5,780,000 | $ 6,792,000 | $ 6,911,000
Average Credit Score Fico | score | 708 | 708 |  |
Percentage of nominal value | 68.00% | 67.00% |  |
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 | $ 15,520,000 | $ 18,820,000 |  |
Allowance for credit losses | 200,000 | 200,000 |  |
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 | 39,000,000 | 40,000,000 |  |
Allowance for credit losses | 5,600,000 | 5,600,000 |  |
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 | 7,000,000 |  |
Allowance for credit losses | 0 | 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 -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 5 -Subparagraph (aaa) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481800/320-10-50-5 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147479344/326-20-45-1 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (f) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479319/326-20-50-13 + Details
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