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Debt Securities Held-to-maturity - Credit quality indicators (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
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Debt securities held to maturity credit quality indicator |  |
Debt securities held-to-maturity | $ 93,163 | $ 97,662
Obligations of Puerto Rico, States and political subdivisions |  |
Debt securities held to maturity credit quality indicator |  |
Debt securities held-to-maturity | 81,067 | $ 85,556
Obligations of Puerto Rico, States and political subdivisions | Munis Payable From Real and Personal Property Taxes |  |
Debt securities held to maturity credit quality indicator |  |
Debt securities held-to-maturity | 35,315 |
Watch | Obligations of Puerto Rico, States and political subdivisions | Munis Payable From Real and Personal Property Taxes |  |
Debt securities held to maturity credit quality indicator |  |
Debt securities held-to-maturity | 20,585 |
Special Mention | Obligations of Puerto Rico, States and political subdivisions | Munis Payable From Real and Personal Property Taxes |  |
Debt securities held to maturity credit quality indicator |  |
Debt securities held-to-maturity | $ 14,730 |

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- Definition Amount of investment in 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 320 -SubTopic 10 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26610-111562 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118939692&loc=d3e27232-111563 + Details
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