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Loans and Leases - Composition of Loan and Lease Portfolio (Details) - USD ($) $ in Millions | Sep. 30, 2022 | Dec. 31, 2021 | Sep. 30, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans | [1] | $ 48,933 |  | $ 45,681 |  |  |
Non-Covered Loans, Percentage | [1] | 100.00% |  | 100.00% |  |  |
Net deferred loan origination costs |  | $ 51 |  | $ 57 |  |  |
Allowance for loan and lease losses |  | (218) |  | (199) |  | $ (202) | $ (194)
Total loans and leases, net |  | 48,766 |  | 45,539 |  |  |
Multi-Family |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 37,179 |  | $ 34,603 |  |  |
Non-Covered Loans, Percentage |  | 75.98% |  | 75.75% |  |  |
Commercial Real Estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 6,603 |  | $ 6,698 |  |  |
Non-Covered Loans, Percentage |  | 13.49% |  | 14.66% |  |  |
One-to-Four Family |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 123 |  | $ 160 |  |  |
Non-Covered Loans, Percentage |  | 0.25% |  | 0.35% |  |  |
Acquisition, Development, and Construction |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 203 |  | $ 209 |  |  |
Non-Covered Loans, Percentage |  | 0.41% |  | 0.46% |  |  |
Mortgage Receivable |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans | [1] | $ 44,108 |  | $ 41,670 |  |  |
Non-Covered Loans, Percentage | [1] | 90.13% |  | 91.22% |  |  |
Allowance for loan and lease losses |  | $ (208) |  | $ (178) |  | $ (177) | $ (176)
Commercial and Industrial |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans | [3] | $ 4,819 | [2] | $ 4,006 | [4] |  |
Non-Covered Loans, Percentage | [3] | 9.86% |  | 8.77% |  |  |
Commercial and Industrial | Other Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 3,122 |  | $ 2,236 |  |  |
Non-Covered Loans, Percentage |  | 6.38% |  | 4.89% |  |  |
Lease Financing, Unearned Income |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 1,697 |  | $ 1,770 |  |  |
Non-Covered Loans, Percentage |  | 3.48% |  | 3.88% |  |  |
Other |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 6 |  | $ 5 |  |  |
Non-Covered Loans, Percentage |  | 0.01% |  | 0.01% |  |  |
Total Other Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 4,825 |  | $ 4,011 |  |  |
Total Other Loans | Other Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 4,825 |  | $ 4,011 |  |  |
Non-Covered Loans, Percentage |  | 9.87% |  | 8.78% |  |  |
[1] | Excludes accrued interest receivable of $203 million and $199 million at September 30, 2022 and December 31, 2021, respectively, which is included in other assets in the Consolidated Statements of Condition.
[2] | Includes lease financing receivables, all of which were classified as Pass.
[3] | Includes specialty finance loans and leases of $4.2 billion and $3.5 billion, respectively, at September 30, 2022 and December 31, 2021, and other C&I loans of $577 million and $527 million, respectively, at September 30, 2022 and December 31, 2021.
[4] | Includes lease financing receivables, all of which were classified as Pass.

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