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Loans and Leases - Quality of Non-Covered Loans (Excluding PCI Loans and Leases) (Detail) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | $ 7,018,522 |
Non-Covered Loans | 42,235,977 | $ 41,844,019
Multi-Family |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-Covered Loans | 31,271,073 | 31,158,672
Commercial Real Estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-Covered Loans | 7,034,720 | 7,081,910
One-to-four family |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-Covered Loans | 352,301 | 380,361
Acquisition, development, and construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-Covered Loans | 130,675 | 200,596
Commercial and Industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non- Accrual | 566,000 |
Non-Covered Loans | 3,437,694 | 3,014,378
Other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-Covered Loans | 9,514 | 8,102
Non-Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 52,110 | 64,963
Non- Accrual | 49,282 | 61,243
Current | 42,183,867 | 41,779,056
Non-Covered Loans | Financing Receivable, 30-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 2,828 | 3,720
Non-Covered Loans | Multi-Family |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 6,921 | 6,538
Non- Accrual | 4,242 | 5,407
Current | 31,264,152 | 31,152,134
Non-Covered Loans | Multi-Family | Financing Receivable, 30-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 2,679 | 1,131
Non-Covered Loans | Commercial Real Estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 16,198 | 17,375
Non- Accrual | 16,101 | 14,830
Current |  | 7,064,535
Non-Covered Loans | Commercial Real Estate | Financing Receivable, 30-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 97 | 2,545
Non-Covered Loans | One-to-four family |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,721 | 1,730
Non- Accrual | 1,721 | 1,730
Current | 350,580 | 378,631
Non-Covered Loans | Acquisition, development, and construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 130,675 | 200,596
Non-Covered Loans | Commercial and Industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 27,098 | 39,024
Non- Accrual | 27,060 | 39,024
Current | 3,410,596 | 2,975,354
Non-Covered Loans | Commercial and Industrial | Financing Receivable, 30-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 38 | 0
Non-Covered Loans | Other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 172 | 296
Non- Accrual | 158 | 252
Current | 9,342 | 7,806
Non-Covered Loans | Other | Financing Receivable, 30-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 14 | $ 44

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