Loans and Leases - Quality of Loans Held for Sale (Details) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Financing Receivable, Recorded Investment, Past Due
Total non-accrual loans held for sale	$ 323	$ 164
Loans held for investment \| Multi-family
Financing Receivable, Recorded Investment, Past Due
Total non-accrual loans held for sale	51	0
Loans held for investment \| Commercial real estate
Financing Receivable, Recorded Investment, Past Due
Total non-accrual loans held for sale	215	163
Loans held for investment \| One-to-four family first mortgage
Financing Receivable, Recorded Investment, Past Due
Total non-accrual loans held for sale	57	0
Loans held for investment \| Acquisition, development, and construction
Financing Receivable, Recorded Investment, Past Due
Total non-accrual loans held for sale	$ 0	$ 1

Amortized cost of financing receivable on nonaccrual status. Excludes net investment in lease.

Reference 1: http://fasb.org/us-gaap/role/ref/otherTransitionRef
-Topic 310
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481962/310-10-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph a
-Subparagraph (3)
-Publisher SEC

Reference 3: http://www.xbrl.org/2003/role/disclosureRef
-Name Regulation S-K (SK)
-Number 229
-Section 1405
-Paragraph a
-Subparagraph (2)
-Publisher SEC

Reference 4: http://www.xbrl.org/2003/role/disclosureRef
-Topic 326
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 16
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147479319/326-20-50-16

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