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Loans and Leases - Portfolio of Loans Held for Investment by Credit Quality Indicator (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
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Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans | [1] | $ 45,681 |  | $ 42,822 |
Multi-Family |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 34,603 |  | 32,236 |
Multi-Family | Pass |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 33,011 |  | 31,220 |
Multi-Family | Special Mention |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 981 |  | 567 |
Multi-Family | Substandard |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 611 |  | 449 |
Commercial Real Estate |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 6,698 |  | 6,836 |
Commercial Real Estate | Pass |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 5,874 |  | 5,884 |
Commercial Real Estate | Special Mention |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 643 |  | 637 |
Commercial Real Estate | Substandard |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 181 |  | 315 |
One-to-Four Family |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 160 |  | 236 |
One-to-Four Family | Pass |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 137 |  | 222 |
One-to-Four Family | Special Mention |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 14 |  | 12 |
One-to-Four Family | Substandard |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 9 |  | 2 |
Acquisition, Development, and Construction |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 209 |  | 90 |
Acquisition, Development, and Construction | Pass |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 204 |  | 68 |
Acquisition, Development, and Construction | Special Mention |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 5 |  | 22 |
Mortgage Receivable |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 41,670 |  | 39,398 |
Mortgage Receivable | Pass |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 39,226 |  | 37,394 |
Mortgage Receivable | Special Mention |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 1,643 |  | 1,238 |
Mortgage Receivable | Substandard |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 801 |  | 766 |
Commercial and Industrial |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans | [3] | 4,006 | [2] | 3,417 | [4]
Commercial and Industrial | Pass |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 3,959 | [2] | 3,388 | [4]
Commercial and Industrial | Special Mention |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 2 | [2] | 3 | [4]
Commercial and Industrial | Substandard |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 45 | [2] | 26 | [4]
Other |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 5 |  | 7 |
Other | Pass |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 5 |  | 7 |
Total Other Loans |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 4,011 |  | 3,424 |
Total Other Loans | Pass |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 3,964 |  | 3,395 |
Total Other Loans | Special Mention |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | 2 |  | 3 |
Total Other Loans | Substandard |  |  |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 45 |  | $ 26 |
[1] | Excludes accrued interest receivable of $199 million and $219 million at December 31, 2021 and December 31, 2020, 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 $3.5 billion and $3.0 billion, respectively, at December 31, 2021 and December 31, 2020, and other C&I loans of $527 million and $393 million, respectively, at December 31, 2021 and December 31, 2020.
[4] | Includes lease financing receivables, all of which were classified as Pass.

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