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Debt Securities Held-to-maturity - Credit quality indicators (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
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Debt securities held to maturity credit quality indicator |  |
Held to maturity securities | $ 85,655 | $ 92,621
Obligations of Puerto Rico, States and political subdivisions |  |
Debt securities held to maturity credit quality indicator |  |
Held to maturity securities | 74,064 | 81,029
Obligations of Puerto Rico, States and political subdivisions | Munis Payable From Real and Personal Property Taxes |  |
Debt securities held to maturity credit quality indicator |  |
Held to maturity securities | 30,145 | 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 |  |
Held to maturity securities | 16,345 | 35,315
Pass | Obligations of Puerto Rico, States and political subdivisions | Munis Payable From Real and Personal Property Taxes |  |
Debt securities held to maturity credit quality indicator |  |
Held to maturity securities | $ 13,800 | $ 0

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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=121553693&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=121645371&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(6)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 + Details
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