Investment Securities (Maturity Dates of Marketable Debt Securities) (Details) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Debt Securities, Available-for-sale [Line Items]
Fair Value	$ 73,225	$ 81,643
Total debt securities available for sale by maturity dates
Debt Securities, Available-for-sale [Line Items]
Fair Value	73,225
Under 1 Year	42,581
1 Year up to 5 Years	30,644
More than 5 Years	0
U.S. Government securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	38,657
Under 1 Year	9,647
1 Year up to 5 Years	29,010
More than 5 Years	0
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	12,042
Under 1 Year	12,042
1 Year up to 5 Years	0
More than 5 Years	0
U.S. mortgage-backed securities
Debt Securities, Available-for-sale [Line Items]
Fair Value	17,358
Under 1 Year	15,724
1 Year up to 5 Years	1,634
More than 5 Years	0
Commercial paper
Debt Securities, Available-for-sale [Line Items]
Fair Value	5,168
Under 1 Year	5,168
1 Year up to 5 Years	0
More than 5 Years	$ 0

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