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Commitments and Credit Risk - Lines of Credit (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Commitments and Credit Risk
Letters of credit outstanding, amount	$ 16.5	$ 16.7
Commercial lines of credit
Commitments and Credit Risk
Letters of credit outstanding, amount	1,000.0	1,800.0
Open-end consumer lines of credit
Commitments and Credit Risk
Letters of credit outstanding, amount	$ 204.0	$ 199.2

X

- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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

X

- 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/2003/role/disclosureRef
-Topic 810
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
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-Publisher FASB
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Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
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-Topic 810
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-URI https://asc.fasb.org//1943274/2147481203/810-10-50-3

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 810
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-Section 45
-Paragraph 25
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-URI https://asc.fasb.org//1943274/2147481231/810-10-45-25

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-Topic 860
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-Name Accounting Standards Codification
-Section 50
-Paragraph 1A
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-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481420/860-30-50-1A

Reference 7: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
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-Paragraph 1A
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Period Type:	duration

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

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Namespace Prefix:
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Balance Type:
Period Type: