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Loans and Leases - Composition of Loan and Lease Portfolio (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Dec. 31, 2019
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 43,631 |  | $ 42,822 |  |  |
Non-Covered Loans, Percentage |  | 100.00% |  | 100.00% |  |  |
Net deferred loan origination costs |  | $ 56 |  | $ 62 |  |  |
Allowance for credit losses loans and leases |  | (200) |  | (194) |  | $ (188) | $ (148)
Total loans and leases held for investment, net |  | 43,487 |  | 42,690 |  |  |
Loans held for sale | [1] |  |  | 117 |  |  |
Total loans and leases held for investment and held for sale, net |  | 43,487 |  | 42,807 |  |  |
Multi-Family |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 32,838 |  | $ 32,236 |  |  |
Non-Covered Loans, Percentage |  | 75.27% |  | 75.28% |  |  |
Commercial Real Estate |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 6,715 |  | $ 6,836 |  |  |
Non-Covered Loans, Percentage |  | 15.39% |  | 15.96% |  |  |
One-to-Four Family |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 170 |  | $ 236 |  |  |
Non-Covered Loans, Percentage |  | 0.39% |  | 0.55% |  |  |
Acquisition, Development, and Construction |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 198 |  | $ 90 |  |  |
Non-Covered Loans, Percentage |  | 0.45% |  | 0.21% |  |  |
Mortgage Receivable |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans | [2] | $ 39,921 |  | $ 39,398 |  |  |
Non-Covered Loans, Percentage | [2] | 91.50% |  | 92.00% |  |  |
Allowance for credit losses loans and leases |  | $ (177) |  | $ (176) |  | $ (171) | $ (123)
Commercial and Industrial |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans | [4] | $ 3,704 | [3] | $ 3,417 | [5] |  |
Non-Covered Loans, Percentage | [4] | 8.49% |  | 7.98% |  |  |
Commercial and Industrial | Other Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 1,936 |  | $ 1,682 |  |  |
Non-Covered Loans, Percentage |  | 4.44% |  | 3.93% |  |  |
Lease Financing, Unearned Income |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 1,768 |  | $ 1,735 |  |  |
Non-Covered Loans, Percentage |  | 4.05% |  | 4.05% |  |  |
Other |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 6 |  | $ 7 |  |  |
Non-Covered Loans, Percentage |  | 0.01% |  | 0.02% |  |  |
Total Other Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans |  | $ 3,710 |  | $ 3,424 |  |  |
Total Other Loans | Other Loans |  |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |  |
Non-Covered Loans | [2] | $ 3,710 |  | $ 3,424 |  |  |
Non-Covered Loans, Percentage | [2] | 8.50% |  | 8.00% |  |  |
[1] | Includes deferred loan origination fees of $2 million at December 31, 2020.
[2] | Excludes accrued interest receivable of $207 million and $219 million at September 30, 2021 and December 31, 2020, respectively, which is included in other assets in the Consolidated Statements of Condition.
[3] | Includes lease financing receivables, all of which were classified as Pass.
[4] | 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.
[5] | Includes lease financing receivables, all of which were classified as Pass.

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