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Allowance for Credit Losses on Loans and Leases - Schedule of Activity in the Allowance for Loan and Lease Losses (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable, Allowance for Credit Losses |  |  |
Balance, beginning of period | $ 992 | $ 393 | $ 199
Charge-offs | (938) | (223) | (7)
Recoveries | 46 | 15 | 11
Provision for (recovery of) credit losses on loans and leases | 1,101 | 794 | 139
Adjustment for Purchased PCD Loans |  | 13 | 51
Balance, end of period | 1,201 | 992 | 393
Loans held for investment | Multi-family |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |
Balance, beginning of period | 307 | 178 | 159
Charge-offs | (308) | (119) | (1)
Recoveries | 5 | 0 | 0
Provision for (recovery of) credit losses on loans and leases | 635 | 248 | 11
Adjustment for Purchased PCD Loans |  | 0 | 9
Balance, end of period | 639 | 307 | 178
Loans held for investment | Commercial real estate |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |
Balance, beginning of period | 366 | 47 | 17
Charge-offs | (462) | (56) | (4)
Recoveries | 8 | 0 | 4
Provision for (recovery of) credit losses on loans and leases | 348 | 375 | 12
Adjustment for Purchased PCD Loans |  | 0 | 18
Balance, end of period | 260 | 366 | 47
Loans held for investment | One-to-four family first mortgage |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |
Balance, beginning of period | 47 | 46 | 0
Charge-offs | (8) | (4) | 0
Recoveries | 5 | 0 | 0
Provision for (recovery of) credit losses on loans and leases | (5) | 5 | 29
Adjustment for Purchased PCD Loans |  | 0 | 17
Balance, end of period | 39 | 47 | 46
Loans held for investment | Acquisition, development, and construction |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |
Balance, beginning of period | 36 | 20 | 3
Charge-offs | (4) | 0 | 0
Recoveries | 0 | 0 | 0
Provision for (recovery of) credit losses on loans and leases | 12 | 16 | 10
Adjustment for Purchased PCD Loans |  | 0 | 7
Balance, end of period | 44 | 36 | 20
Other loans held for investment |  |  |
Financing Receivable, Allowance for Credit Losses |  |  |
Balance, beginning of period | 236 | 102 | 20
Charge-offs | (156) | (44) | (2)
Recoveries | 28 | 15 | 7
Provision for (recovery of) credit losses on loans and leases | 111 | 150 | 77
Adjustment for Purchased PCD Loans |  | 13 | 0
Balance, end of period | $ 219 | $ 236 | $ 102

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- Definition Amount excluding accrued interest, of allowance for credit loss on financing receivable. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479344/326-20-45-1 + Details
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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/2003/role/disclosureRef -Name Regulation S-K (SK) -Number 229 -Section 1405 -Paragraph c -Publisher SEC Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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- Definition Amount, excluding accrued interest, of increase in allowance for credit loss on financing receivable from recovery. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (e) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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- Definition Amount, excluding accrued interest, of decrease in allowance for credit loss on financing receivable from writeoff. Excludes net investment in lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 6 -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-6 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 326 -SubTopic 20 -Name Accounting Standards Codification -Section 50 -Paragraph 13 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147479319/326-20-50-13 + Details
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