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Loans and Leases - Performance of Loans Modified in Last 12 Months (Details) $ in Millions	Dec. 31, 2023 USD ($)
Financing Receivable, Modified [Line Items]
Total	$ 27
Current
Financing Receivable, Modified [Line Items]
Total	8
Loans 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Total	10
90+ Past Due
Financing Receivable, Modified [Line Items]
Total	9
Mortgage Loans | One-to-four family first mortgage
Financing Receivable, Modified [Line Items]
Total	11
Mortgage Loans | One-to-four family first mortgage | Current
Financing Receivable, Modified [Line Items]
Total	3
Mortgage Loans | One-to-four family first mortgage | Loans 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Total	0
Mortgage Loans | One-to-four family first mortgage | 90+ Past Due
Financing Receivable, Modified [Line Items]
Total	8
Mortgage Loans | Commercial real estate
Financing Receivable, Modified [Line Items]
Total	1
Mortgage Loans | Commercial real estate | Current
Financing Receivable, Modified [Line Items]
Total	1
Mortgage Loans | Commercial real estate | Loans 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Total	0
Mortgage Loans | Commercial real estate | 90+ Past Due
Financing Receivable, Modified [Line Items]
Total	0
Other Loans: | Commercial and industrial
Financing Receivable, Modified [Line Items]
Total	13
Other Loans: | Commercial and industrial | Current
Financing Receivable, Modified [Line Items]
Total	3
Other Loans: | Commercial and industrial | Loans 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Total	9
Other Loans: | Commercial and industrial | 90+ Past Due
Financing Receivable, Modified [Line Items]
Total	1
Other Loans: | Other
Financing Receivable, Modified [Line Items]
Total	2
Other Loans: | Other | Current
Financing Receivable, Modified [Line Items]
Total	1
Other Loans: | Other | Loans 30-89 Days Past Due
Financing Receivable, Modified [Line Items]
Total	1
Other Loans: | Other | 90+ Past Due
Financing Receivable, Modified [Line Items]
Total	$ 0

X

- Definition

Amortized cost excluding accrued interest, of financing receivable 12 months after modification for debtor experiencing financial difficulty.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(3)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-42

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- Definition

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+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-42

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Subparagraph (a)(2)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-42

Reference 3: http://www.xbrl.org/2003/role/exampleRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 55
-Paragraph 12A
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481933/310-10-55-12A

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 33
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-33

Reference 5: http://www.xbrl.org/2003/role/disclosureRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 34
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481962/310-10-50-34

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