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Loans and Leases - Portfolio of Loans Held for Investment by Credit Quality Indicator (Details) - USD ($) $ in Millions | Mar. 31, 2022 | Dec. 31, 2021
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Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans | [1] | $ 46,703 |  | $ 45,681 |
Multi-Family |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 35,751 |  | 34,603 |
Multi-Family | Pass |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 34,087 |  | 33,011 |
Multi-Family | Special Mention |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 998 |  | 981 |
Multi-Family | Substandard |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 666 |  | 611 |
Commercial Real Estate |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 6,701 |  | 6,698 |
Commercial Real Estate | Pass |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 5,951 |  | 5,874 |
Commercial Real Estate | Special Mention |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 577 |  | 643 |
Commercial Real Estate | Substandard |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 173 |  | 181 |
One-to-Four Family |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 145 |  | 160 |
One-to-Four Family | Pass |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 122 |  | 137 |
One-to-Four Family | Special Mention |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 23 |  | 14 |
One-to-Four Family | Substandard |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  |  |  | 9 |
Acquisition, Development, and Construction |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 237 |  | 209 |
Acquisition, Development, and Construction | Pass |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 233 |  | 204 |
Acquisition, Development, and Construction | Special Mention |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 4 |  | 5 |
Mortgage Receivable |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans | [1] | 42,834 |  | 41,670 |
Mortgage Receivable | Pass |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 40,393 |  | 39,226 |
Mortgage Receivable | Special Mention |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 1,602 |  | 1,643 |
Mortgage Receivable | Substandard |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 839 |  | 801 |
Commercial and Industrial |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans | [3] | 3,863 | [2] | 4,006 | [4]
Commercial and Industrial | Pass |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 3,858 | [2] | 3,959 | [4]
Commercial and Industrial | Special Mention |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans | [4] |  |  | 2 |
Commercial and Industrial | Substandard |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 5 | [2] | 45 | [4]
Other |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 6 |  | 5 |
Other | Pass |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 6 |  | 5 |
Total Other Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 3,869 |  | 4,011 |
Total Other Loans | Pass |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 3,864 |  | 3,964 |
Total Other Loans | Special Mention |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  |  |  | 2 |
Total Other Loans | Substandard |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 5 |  | $ 45 |
[1] | Excludes accrued interest receivable of $200 million and $199 million at March 31, 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 $3.3 billion and $3.5 billion, respectively, at March 31, 2022 and December 31, 2021, and other C&I loans of $548 million and $527 million, respectively, at March 31, 2022 and December 31, 2021.
[4] | Includes lease financing receivables, all of which were classified as Pass.

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