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Securities - Additional Information (Details) - USD ($)	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2013
Investment [Line Items]
Available-for-sale securities transferred to held-to-maturity securities		$ 12,700,000	$ 536,000,000
Unrealized net loss on securities reclassified from available-for-sale to held-to-maturity, Gross		(209,000)	$ (13,300,000)
Debt securities, available-for-sale, realized gain (loss)	$ (108,000)	0
Equity investments	102,037,000	$ 101,155,000
Corporate debt securities
Investment [Line Items]
Amortized cost	62,900,000
Fair value	58,800,000
State, municipal and sovereign debt obligations
Investment [Line Items]
Amortized cost	83,200,000
Fair value	78,200,000
Asset-backed securities
Investment [Line Items]
Amortized cost	296,200,000
Fair value	$ 276,900,000

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Equity Investments

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Other Comprehensive Income Reclassification Adjustment For Held To Maturity Transferred From Available For Sale Securities Before Tax

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Securities Transferred From Available For Sale To Held To Maturity

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Amortized cost, before allowance for credit loss, of investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27161-111563

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
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-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=d3e27232-111563

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Fair value of investment in debt security measured at amortized cost (held-to-maturity) and investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 5A
-Subparagraph (a)
-URI https://asc.fasb.org/extlink&oid=126970911&loc=SL120269820-111563

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-Name Accounting Standards Codification
-Topic 320
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Amount of realized gain (loss) on investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale).

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
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-Section 50
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-Subparagraph (a)
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