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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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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

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-Publisher FASB
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-SubTopic 10
-Section 50
-Paragraph 9
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