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Quality of Non-Covered Loans (Excluding PCI Loans and Leases) (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | $ 7,064,535 |
Non-Covered Loans | 41,844,019 | $ 40,133,861
Financing Receivable, 30-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 530,000,000
Multi-Family |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-Covered Loans | 31,158,672 | 29,883,919
Multi-Family | Financing Receivable, 30-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,131 |
Commercial Real Estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-Covered Loans | 7,081,910 | 6,998,834
One-to-four family |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-Covered Loans | 380,361 | 446,094
Acquisition, development, and construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-Covered Loans | 200,596 | 407,870
Commercial and Industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non- Accrual | 194,000,000 |
Non-Covered Loans | 3,014,378 | 2,388,420
Other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Non-Covered Loans | 8,102 | 8,724
Non-Covered Loans |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 64,963 | 46,070
Non- Accrual | 61,243 | 45,506
Current | 41,779,056 | 40,087,791
Non-Covered Loans | Financing Receivable, 30-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 3,720 | 564
Non-Covered Loans | Multi-Family |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 6,538 | 4,220
Non- Accrual | 5,407 | 4,220
Current | 31,152,134 | 29,879,699
Non-Covered Loans | Commercial Real Estate |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 17,375 | 3,021
Non- Accrual | 14,830 | 3,021
Current |  | 6,995,813
Non-Covered Loans | Commercial Real Estate | Financing Receivable, 30-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 2,545 |
Non-Covered Loans | One-to-four family |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 1,730 | 1,660
Non- Accrual | 1,730 | 1,651
Current | 378,631 | 444,434
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
Non-Covered Loans | Acquisition, development, and construction |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Current | 200,596 | 407,870
Non-Covered Loans | Commercial and Industrial |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 39,024 | 37,138
Non- Accrual | 39,024 | 36,608
Current | 2,975,354 | 2,351,282
Non-Covered Loans | Commercial and Industrial | Financing Receivable, 30-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due |  | 530
Non-Covered Loans | Other |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | 296 | 31
Non- Accrual | 252 | 6
Current | 7,806 | 8,693
Non-Covered Loans | Other | Financing Receivable, 30-89 Days Past Due |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |
Total Past Due | $ 44 | $ 25

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