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Loans and Leases - Quality of Loans Held for Investment (Details) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Loans Receivable |  | $ 42,767,551 | $ 41,844,019
Multi-Family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Loans Receivable |  | 32,100,281 | 31,158,672
Commercial Real Estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Loans Receivable |  | 6,884,667 | 7,081,910
One-to-Four Family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Loans Receivable |  | 274,095 | 380,361
Acquisition, Development, and Construction |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Loans Receivable |  | 86,007 | 200,596
Commercial and Industrial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Non- Accrual Loans |  | 5,700 |
Total Loans Receivable | [1],[2] | 3,416,040 | 3,014,378
Other |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Loans Receivable |  | 6,461 | 8,102
Non-Covered Loans |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans |  | 50,480 | 64,963
Non- Accrual Loans |  | 45,351 | 61,243
Current Loans |  | 42,717,071 | 41,779,056
Total Loans Receivable |  | 42,767,551 | 41,844,019
Non-Covered Loans | Financing Receivable, 30-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans |  | 5,129 | 3,720
Non-Covered Loans | Multi-Family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans |  | 4,446 | 6,538
Non- Accrual Loans |  | 4,068 | 5,407
Current Loans |  | 32,095,835 | 31,152,134
Total Loans Receivable |  | 32,100,281 | 31,158,672
Non-Covered Loans | Multi-Family | Financing Receivable, 30-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans |  | 378 | 1,131
Non-Covered Loans | Commercial Real Estate |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans |  | 15,290 | 17,375
Non- Accrual Loans |  | 12,673 | 14,830
Current Loans |  | 6,869,377 | 7,064,535
Total Loans Receivable |  | 6,884,667 | 7,081,910
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 |  | 2,617 | 2,545
Non-Covered Loans | One-to-Four Family |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans |  | 3,784 | 1,730
Non- Accrual Loans |  | 1,706 | 1,730
Current Loans |  | 270,311 | 378,631
Total Loans Receivable |  | 274,095 | 380,361
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 |  | 2,078 |
Non-Covered Loans | Acquisition, Development, and Construction |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Current Loans |  | 86,007 | 200,596
Total Loans Receivable |  | 86,007 | 200,596
Non-Covered Loans | Commercial and Industrial |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans |  | 26,902 | 39,024
Non- Accrual Loans |  | 26,902 | 39,024
Current Loans |  | 3,389,138 | 2,975,354
Total Loans Receivable |  | 3,416,040 | 3,014,378
Non-Covered Loans | Other |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans |  | 58 | 296
Non- Accrual Loans |  | 2 | 252
Current Loans |  | 6,403 | 7,806
Total Loans Receivable |  | 6,461 | 8,102
Non-Covered Loans | Other | Financing Receivable, 30-89 Days Past Due |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |
Total Past Due Loans |  | $ 56 | $ 44
[1] | Includes lease financing receivables, all of which were classified as Pass
[2] | Includes specialty finance loans and leases of $3.1 billion and $2.6 billion, respectively, at September 30, 2020 and December 31, 2019, and other C&I loans of $394.3 million and $420.1 million, respectively, at September 30, 2020 and December 31, 2019.

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