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Loans and Leases - Portfolio of Loans Held for Investment by Credit Quality Indicator (Details) - USD ($) $ in Thousands | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans | [1] | $ 42,821,790 | $ 41,844,019
Multi-Family |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 32,236,385 | 31,158,672
Multi-Family | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 31,220,071 | 30,903,657
Multi-Family | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 566,756 | 239,664
Multi-Family | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 449,558 | 15,351
Commercial Real Estate |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 6,835,763 | 7,081,910
Commercial Real Estate | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 5,884,244 | 6,902,218
Commercial Real Estate | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 637,101 | 104,648
Commercial Real Estate | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 314,418 | 75,044
One-to-Four Family |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 235,989 | 380,361
One-to-Four Family | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 221,861 | 377,883
One-to-Four Family | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 12,436 | 748
One-to-Four Family | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 1,692 | 1,730
Acquisition, Development, and Construction |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 89,790 | 200,596
Acquisition, Development, and Construction | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 68,233 | 158,751
Acquisition, Development, and Construction | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 21,557 | 41,456
Acquisition, Development, and Construction | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  |  | 389
Mortgage Receivable |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans | [1] | 39,397,927 | 38,821,539
Mortgage Receivable | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 37,394,409 | 38,342,509
Mortgage Receivable | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 1,237,850 | 386,516
Mortgage Receivable | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 765,668 | 92,514
Commercial and Industrial |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans | [2],[3] | 3,417,343 | 3,014,378
Commercial and Industrial | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans | [3] | 3,388,293 | 2,960,557
Commercial and Industrial | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans | [3] | 2,842 | 1,588
Commercial and Industrial | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans | [3] | 26,208 | 52,233
Other |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 6,520 | 8,102
Other | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 6,507 | 7,850
Other | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 13 | 252
Total Other Loans |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 3,423,863 | 3,022,480
Total Other Loans | Pass |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 3,394,800 | 2,968,407
Total Other Loans | Special Mention |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | 2,842 | 1,588
Total Other Loans | Substandard |  |  |
Financing Receivable, Recorded Investment [Line Items] |  |  |
Non-Covered Loans |  | $ 26,221 | $ 52,485
[1] | Excludes accrued interest receivable of $219.1 million and $116.9 million at December 31, 2020 and December 31, 2019, respectively, which is included in other assets in the Consolidated Statements of Condition.
[2] | Includes specialty finance loans and leases of $3.0 billion and $2.6 billion, respectively, at December 31, 2020 and December 31, 2019, and other C&I loans of $393.3 million and $420.1 million, respectively, at December 31, 2020 and December 31, 2019.
[3] | Includes lease financing receivables, all of which were classified as Pass.

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