Investment Securities (Maturity Dates of Marketable Debt Securities) (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Market Value	$ 89,239	$ 83,445
Under 1 Year	51,632
1 Year up to 5 Years	37,607
More than 5 Years	0
U.S. Government securities
Debt Securities, Available-for-sale [Line Items]
Market Value	11,412
Under 1 Year	9,068
1 Year up to 5 Years	2,344
More than 5 Years	0
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Market Value	58,481
Under 1 Year	28,863
1 Year up to 5 Years	29,618
More than 5 Years	0
U.S. mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Market Value	5,759
Under 1 Year	114
1 Year up to 5 Years	5,645
More than 5 Years	0
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Market Value	13,587
Under 1 Year	13,587
1 Year up to 5 Years	0
More than 5 Years	$ 0

Fair value of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), with single maturity date and allocated without single maturity date, maturing in second through fifth fiscal year following current fiscal year. Excludes interim and annual periods when interim periods are reported from current statement of financial position date (rolling approach).

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