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Fair Value of Financial Instruments - Rollforward of Level 3 Assets Measured on Recurring Basis (Details) - Fair Value, Recurring Measurements [Member] - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022		Jun. 30, 2021
Fair Value Assets Measured On Recurring Basis Unobservable Input Reconciliation [Line Items]
Level 3 assets, beginning of period		$ 10,689	$ 4,177	$ 3,596	[1]	$ 2,047	[1]
Net unrealized gains (losses) included in other comprehensive income		108		106	[1]
Realized gains (losses) and accretion (amortization) recognized in earnings		7	(150)	(200)	[1]	(234)	[1]
Purchases		1,588	999	7,491	[1]	999	[1]
Settlements		(1,400)	(2,190)	(1,400)	[1]	(2,190)	[1]
Transfers into Level 3			500	1,399	[1]	2,714	[1]
Transfers out of Level 3		(9,358)		(9,358)	[1]
Level 3 assets, end of period	[1]	$ 1,634	$ 3,336	$ 1,634		$ 3,336
[1] Activities for investments that enter and exit Level 3 in different quarters within the same fiscal year are not eliminated until the full year amounts are presented.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of gain (loss) recognized in income from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of gain (loss) recognized in other comprehensive income (OCI) from asset measured at fair value on recurring basis using unobservable input (level 3).

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Amount of purchases of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of settlement of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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Amount of transfer of financial instrument classified as an asset into level 3 of the fair value hierarchy.

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Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy.

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Fair value of financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing.

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