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Investment Securities and Fair Value Measurements - Schedule of Sales, Calls and Maturities (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Gross Realized Gains |  |  | $ 6 | $ 33
Gross Realized Losses |  |  | 0 | 0
Gross Proceeds from Sales |  |  | 42,198 | 13,942
Gross Proceeds from Maturities |  |  | 26,750 | 7,750
Interest income, net of amortization and accretion of premium and discount | $ 100 | $ 100 | 100 | 200
Corporate bonds |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Gross Realized Gains |  |  |  | 5
Gross Realized Losses |  |  |  | 0
Gross Proceeds from Sales |  |  |  | 4,006
Gross Proceeds from Maturities |  |  |  | 4,000
Agency securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Gross Realized Gains |  |  | 0 | 24
Gross Realized Losses |  |  | 0 | 0
Gross Proceeds from Sales |  |  | 0 | 7,878
Gross Proceeds from Maturities |  |  | 5,250 | 1,250
Treasury securities |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |
Gross Realized Gains |  |  | 6 | 4
Gross Realized Losses |  |  | 0 | 0
Gross Proceeds from Sales |  |  | 42,198 | 2,058
Gross Proceeds from Maturities |  |  | $ 21,500 | $ 2,500

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