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Investment Securities and Fair Value Measurements - Sales and Maturities (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items] |  |  |
Gross Realized Gains | $ 35 | $ 6 |
Gross Realized Losses | (2) | (1) |
Gross Proceeds from Sales | 16,711 | 2,750 | $ 20,900
Gross Proceeds from Maturities | 27,330 | 15,660 | $ 32,819
Corporate bonds |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Gross Realized Gains | 6 | 0 |
Gross Realized Losses | 0 | (1) |
Gross Proceeds from Sales | 4,006 | 2,750 |
Gross Proceeds from Maturities | 5,600 | 11,350 |
Agency securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Gross Realized Gains | 25 | 6 |
Gross Realized Losses | 0 | 0 |
Gross Proceeds from Sales | 7,878 | 0 |
Gross Proceeds from Maturities | 1,900 | 3,625 |
Treasury securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Gross Realized Gains | 4 | 0 |
Gross Realized Losses | (2) | 0 |
Gross Proceeds from Sales | 4,827 | 0 |
Gross Proceeds from Maturities | $ 19,830 | $ 685 |

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- Definition Amount of realized gain on 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://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27357-111563 + Details
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