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Debt Securities Held-to-maturity - Debt securities held-to-maturity-Additional Information (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
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Debt Securities, Held-to-maturity |  |
Amortized Cost | $ 97,707 | $ 101,575
Obligations of Puerto Rico, States and political subdivisions |  |
Debt Securities, Held-to-maturity |  |
Amortized Cost | 85,598 | $ 89,459
Obligations of Puerto Rico, States and political subdivisions | Munis Payable From Real and Personal Property Taxes |  |
Debt Securities, Held-to-maturity |  |
Amortized Cost | 40,000 |
Obligations of Puerto Rico, States and political subdivisions | Munis Not Guaranteed By Puerto Rico Central Government |  |
Debt Securities, Held-to-maturity |  |
Amortized Cost | $ 46,000 |

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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=109979856&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=82897076&loc=d3e27232-111563 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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