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Quality of Non-Covered Loans (Excluding PCI Loans and Leases) (Detail) - USD ($) | Mar. 31, 2019 | Dec. 31, 2018 | Mar. 31, 2018
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Non-Covered Loans |  | $ 40,487,430,000 |  | $ 40,133,861,000 |  |
Multi-Family |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Non-Covered Loans |  | 29,932,829,000 |  | 29,883,919,000 |  |
Commercial Real Estate |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Non-Covered Loans |  | 7,079,241,000 |  | 6,998,834,000 |  |
One-to-four family |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Non-Covered Loans |  | 435,686,000 |  | 446,094,000 |  |
Acquisition, development, and construction |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Non-Covered Loans |  | 326,634,000 |  | 407,870,000 |  |
Commercial and Industrial |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Non- Accrual |  | 566,000 |  |  |  | $ 2,900,000
Non-Covered Loans | [2] | 2,705,064,000 | [1] | 2,388,420,000 | [3] |
Other |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Non-Covered Loans |  | 7,976,000 |  | 8,724,000 |  |
Non-Covered Loans |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Past Due |  | 71,104,000 |  | 46,070,000 |  |
Non- Accrual |  | 58,574,000 |  | 45,506,000 |  |
Current |  | 40,416,326,000 |  | 40,087,791,000 |  |
Non-Covered Loans | Financing Receivable, 30-89 Days Past Due |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Past Due |  | 12,530,000 |  | 564,000 |  |
Non-Covered Loans | Multi-Family |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Past Due |  | 6,429,000 |  | 4,220,000 |  |
Non- Accrual |  | 4,070,000 |  | 4,220,000 |  |
Current |  | 29,926,400,000 |  | 29,879,699,000 |  |
Non-Covered Loans | Multi-Family | Financing Receivable, 30-89 Days Past Due |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Past Due |  | 2,359,000 |  |  |  |
Non-Covered Loans | Commercial Real Estate |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Past Due |  | 6,285,000 |  | 3,021,000 |  |
Non- Accrual |  | 3,007,000 |  | 3,021,000 |  |
Current |  | 7,072,956,000 |  | 6,995,813,000 |  |
Non-Covered Loans | Commercial Real Estate | Financing Receivable, 30-89 Days Past Due |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Past Due |  | 3,278,000 |  |  |  |
Non-Covered Loans | One-to-four family |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Past Due |  | 1,646,000 |  | 1,660,000 |  |
Non- Accrual |  | 1,637,000 |  | 1,651,000 |  |
Current |  | 434,040,000 |  | 444,434,000 |  |
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 |  | 9,000 |  | 9,000 |  |
Non-Covered Loans | Acquisition, development, and construction |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Past Due |  | 6,608,000 |  |  |  |
Current |  | 320,026,000 |  | 407,870,000 |  |
Non-Covered Loans | Acquisition, development, and construction | Financing Receivable, 30-89 Days Past Due |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Past Due |  | 6,608,000 |  |  |  |
Non-Covered Loans | Commercial and Industrial |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | [2] | 50,082,000 | [1] | 37,138,000 | [3] |
Non- Accrual | [2] | 49,851,000 | [1] | 36,608,000 | [3] |
Current | [2] | 2,654,982,000 | [1] | 2,351,282,000 | [3] |
Non-Covered Loans | Commercial and Industrial | Financing Receivable, 30-89 Days Past Due |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Past Due | [2] | 231,000 | [1] | 530,000 | [3] |
Non-Covered Loans | Other |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Past Due |  | 54,000 |  | 31,000 |  |
Non- Accrual |  | 9,000 |  | 6,000 |  |
Current |  | 7,922,000 |  | 8,693,000 |  |
Non-Covered Loans | Other | Financing Receivable, 30-89 Days Past Due |  |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |  |
Total Past Due |  | $ 45,000 |  | $ 25,000 |  |
[1] | Includes $33.8 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.
[2] | Includes lease financing receivables, all of which were current.
[3] | Includes $530,000 and $35.5 million of taxi medallion-related loans that were 30 to 89 days past due and 90 days or more past due, respectively.

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