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Borrowings under Repurchase Agreements (Details) $ in Millions	6 Months Ended
	Jun. 30, 2023 USD ($) counterparties	Dec. 31, 2022 USD ($) counterparties
Repurchase Agreements [Line Items]
Number of Counterparties with Outstanding Repurchase Agreements | counterparties	18	16
Pledged Assets, Unsettled		$ 33.0
Securities Sold under Agreements to Repurchase, Fair Value of Collateral	$ 900.0	882.0
Minimum
Repurchase Agreements [Line Items]
Repurchase Agreements Maturity	30 days
Maximum
Repurchase Agreements [Line Items]
Repurchase Agreements Maturity	364 days
Repurchase Agreements [Member]
Repurchase Agreements [Line Items]
Cash Collateral (Received) Pledged	$ 11.7	$ 10.3

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Number of counterparties with outstanding repurchase agreements at period end.

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The carrying amount as of the date of the latest financial statement presented of securities which are owned but transferred to serve as collateral for repurchase agreements which have been sold prior to period end but remain unsettled at the balance sheet date.

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[Line Items] for Repurchase Agreements [Table]

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Repurchase Agreements Maturity

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(1))
-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
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-Publisher FASB
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Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Topic 230
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482913/230-10-50-8

Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Topic 942
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Fair value of securities pledged as collateral against securities sold under agreement to repurchase.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 20
-Name Accounting Standards Codification
-Section 55
-Paragraph 12
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-URI https://asc.fasb.org//1943274/2147483444/210-20-55-12

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