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Short-Term Borrowings and Other Obligations - Lines of Credit (Details) - Line of credit - USD ($) $ in Millions	Sep. 30, 2023	Dec. 31, 2022
Federal home loan bank borrowings
Line of Credit Facility [Line Items]
Lines of credit	$ 1,023.0	$ 711.6
Federal reserve line of credit
Line of Credit Facility [Line Items]
Lines of credit	57.3	58.7
Federal reserve line of credit | Federal Reserve Bank Term Funding Program
Line of Credit Facility [Line Items]
Lines of credit	274.6
Unsecured debt | Federal funds purchased
Line of Credit Facility [Line Items]
Lines of credit	$ 135.0	$ 150.0

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- Definition

Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.19(b),22(b))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

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.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(f))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

+ Details

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Period Type:	duration

X

- Details

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Period Type:

X

- Details

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X

- Details

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X

- Details

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- Details

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- Details

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