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Loans and Leases - Quality of Loans Held for Investment (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Loans Receivable |  | $ 43,631 |  | $ 42,822 |  |
Multi-Family |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Loans Receivable |  | 32,838 |  | 32,236 |  |
Commercial Real Estate |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Loans Receivable |  | 6,715 |  | 6,836 |  |
One-to-Four Family |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Loans Receivable |  | 170 |  | 236 |  |
Acquisition, Development, and Construction |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Loans Receivable |  | 198 |  | 90 |  |
Commercial and Industrial |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Non- Accrual Loans |  |  |  |  |  | $ 6
Total Loans Receivable | [2] | 3,704 | [1] | 3,417 | [3] |
Other |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Loans Receivable |  | 6 |  | 7 |  |
Non-Covered Loans |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Past Due Loans |  | 475 |  | 54 |  |
Non- Accrual Loans |  | 28 |  | 38 |  |
Current Loans |  | 43,156 |  | 42,768 |  |
Total Loans Receivable |  | 43,631 |  | 42,822 |  |
Non-Covered Loans | Financing Receivable, 30-89 Days Past Due |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Past Due Loans |  | 447 |  | 16 |  |
Non-Covered Loans | Multi-Family |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Past Due Loans |  | 434 |  | 8 |  |
Non- Accrual Loans |  | 8 |  | 4 |  |
Current Loans |  | 32,404 |  | 32,228 |  |
Total Loans Receivable |  | 32,838 |  | 32,236 |  |
Non-Covered Loans | Multi-Family | Financing Receivable, 30-89 Days Past Due |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Past Due Loans |  | 426 |  | 4 |  |
Non-Covered Loans | Commercial Real Estate |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Past Due Loans |  | 23 |  | 22 |  |
Non- Accrual Loans |  | 12 |  | 12 |  |
Current Loans |  | 6,692 |  | 6,814 |  |
Total Loans Receivable |  | 6,715 |  | 6,836 |  |
Non-Covered Loans | Commercial Real Estate | Financing Receivable, 30-89 Days Past Due |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Past Due Loans |  | 11 |  | 10 |  |
Non-Covered Loans | One-to-Four Family |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Past Due Loans |  | 11 |  | 4 |  |
Non- Accrual Loans |  | 1 |  | 2 |  |
Current Loans |  | 159 |  | 232 |  |
Total Loans Receivable |  | 170 |  | 236 |  |
Non-Covered Loans | One-to-Four Family | Financing Receivable, 30-89 Days Past Due |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Past Due Loans |  | 10 |  | 2 |  |
Non-Covered Loans | Acquisition, Development, and Construction |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Current Loans |  | 198 |  | 90 |  |
Total Loans Receivable |  | 198 |  | 90 |  |
Non-Covered Loans | Commercial and Industrial |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Past Due Loans |  | 7 | [4],[5] | 20 | [6],[7] |
Non- Accrual Loans |  | 7 | [4],[5] | 20 | [6],[7] |
Current Loans |  | 3,697 | [4],[5] | 3,397 | [6],[7] |
Total Loans Receivable |  | 3,704 | [4],[5] | 3,417 | [6],[7] |
Non-Covered Loans | Other |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Current Loans |  | 6 |  | 7 |  |
Total Loans Receivable |  | $ 6 |  | $ 7 |  |
[1] | Includes lease financing receivables, all of which were classified as Pass.
[2] | Includes specialty finance loans and leases of $3.1 billion and $3.0 billion, respectively, at September 30, 2021 and December 31, 2020, and other C&I loans of $561 million and $393 million, respectively, at September 30, 2021 and December 31, 2020.
[3] | Includes lease financing receivables, all of which were classified as Pass.
[4] | Includes $7 million of taxi medallion-related loans that were 90 days or more past due. There were no taxi medallion-related loans that were 30 to 89 days past due.
[5] | Includes lease financing receivables, all of which were current.
[6] | Includes $19 million of taxi medallion-related loans that were 90 days or more past due. There were no taxi medallion-related loans that were 30 to 89 days past due.
[7] | Includes lease financing receivables, all of which were current.

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