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Balance Sheet Offsetting - Schedule of Assets and Liabilities Subject to an Enforceable Master Netting Arrangement or Repurchase Agreements (Parenthetical) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Interest Rate Swap Agreements
Offsetting Assets And Liabilities [Line Items]
Fair value of investment securities pledged	$ 39.2	$ 34.8
Private Institutions
Offsetting Assets And Liabilities [Line Items]
Fair value of investment securities pledged	167.3	755.9
Government Entities
Offsetting Assets And Liabilities [Line Items]
Fair value of investment securities pledged	$ 0.7	$ 0.8

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- Definition

[Line Items] for Offsetting Assets and Liabilities [Table]

+ References

No definition available.

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- Definition

Fair value of securities pledged as collateral against securities sold under agreement to repurchase.

+ References

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

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