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Debt Securities Available for Sale - Debt securities available- for-sale - Additional Information (Details) - USD ($) | 9 Months Ended |
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Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Debt Securities, Available-for-sale |  |  |
Gross Unrealized Losses | $ 5,356,000 |  | $ 39,817,000
US Treasury Securities |  |  |
Debt Securities, Available-for-sale |  |  |
Proceeds from sale of debt securities available-for-sale | $ 5,000,000 | $ 99,000,000 |

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- Definition Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale. + References No definition available. + Details
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- Definition Amount of cash inflow from sale of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118954083&loc=d3e26853-111562 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3151-108585 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 12 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=118932676&loc=d3e3179-108585 + Details
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- Details
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