Investments - Schedule of Available-for-sale Securities in Continuous Unrealized Loss Position (Details) $ in Thousands	Dec. 31, 2021 USD ($) security	Dec. 31, 2020 USD ($) security
Debt Securities, Available-for-sale [Line Items]
Less than or equal to one year, fair value	$ 344,073	$ 16,603
Less than or equal to one year, gross unrealized losses	$ (4,403)	$ (60)
Less than or equal to one year, number of securities \| security	762	49
More than one year, fair value	$ 25,110	$ 18,929
More than one year, gross unrealized loss	$ (2,707)	$ (2,099)
More than one year, number of securities \| security	102	11
U.S. Treasury securities and obligations of U.S. government authorities and agencies
Debt Securities, Available-for-sale [Line Items]
Less than or equal to one year, fair value	$ 216,378	$ 15,323
Less than or equal to one year, gross unrealized losses	$ (2,827)	$ (58)
Less than or equal to one year, number of securities \| security	324	41
More than one year, fair value	$ 11,920	$ 2
More than one year, gross unrealized loss	$ (370)	$ 0
More than one year, number of securities \| security	47	2
Obligations of state and political subdivisions
Debt Securities, Available-for-sale [Line Items]
Less than or equal to one year, fair value	$ 17,190	$ 379
Less than or equal to one year, gross unrealized losses	$ (275)	$ (1)
Less than or equal to one year, number of securities \| security	64	5
More than one year, fair value	$ 1,152	$ 0
More than one year, gross unrealized loss	$ (38)	$ 0
More than one year, number of securities \| security	5	0
Corporate securities
Debt Securities, Available-for-sale [Line Items]
Less than or equal to one year, fair value	$ 99,434	$ 901
Less than or equal to one year, gross unrealized losses	$ (1,159)	$ (1)
Less than or equal to one year, number of securities \| security	326	3
More than one year, fair value	$ 9,722	$ 0
More than one year, gross unrealized loss	$ (237)	$ 0
More than one year, number of securities \| security	45	0
Asset backed securities
Debt Securities, Available-for-sale [Line Items]
Less than or equal to one year, fair value	$ 7,454	$ 0
Less than or equal to one year, gross unrealized losses	$ (84)	$ 0
Less than or equal to one year, number of securities \| security	38	0
More than one year, fair value	$ 2,316	$ 18,927
More than one year, gross unrealized loss	$ (2,062)	$ (2,099)
More than one year, number of securities \| security	5	9
Certificates of deposit
Debt Securities, Available-for-sale [Line Items]
Less than or equal to one year, fair value	$ 1,339
Less than or equal to one year, gross unrealized losses	$ 0
Less than or equal to one year, number of securities \| security	2
More than one year, fair value	$ 0
More than one year, gross unrealized loss	$ 0
More than one year, number of securities \| security	0
Obligations of foreign governments
Debt Securities, Available-for-sale [Line Items]
Less than or equal to one year, fair value	$ 2,278
Less than or equal to one year, gross unrealized losses	$ (58)
Less than or equal to one year, number of securities \| security	8
More than one year, fair value	$ 0
More than one year, gross unrealized loss	$ 0
More than one year, number of securities \| security	0

Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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-Name Accounting Standards Codification
-Topic 326
-SubTopic 30
-Section 50
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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Amount of accumulated unrealized loss on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
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