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Quality of Non-Covered Loans (Detail) - USD ($) $ in Thousands | Dec. 31, 2015 | Dec. 31, 2014
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Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | $ 35,740,489 |  | $ 33,004,361 |
Multi-Family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 25,971,629 |  | 23,831,846 |
Commercial Real Estate |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 7,857,204 |  | 7,634,320 |
One-to-four family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 116,841 |  | 138,915 |
Acquisition, Development and Construction |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 311,676 |  | 258,116 |
Commercial and Industrial |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans | [1] | 1,450,556 |  | 1,109,221 | [2]
Other |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non-Covered Loans |  | 24,239 |  | 31,943 |
Non-Covered Loans |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 46,825 | [3] | 76,950 |
Total Past Due |  | 53,430 |  | 83,142 |
Current |  | 35,678,715 |  | 32,921,219 |
Non-Covered Loans | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 6,605 |  | 6,192 |
Non-Covered Loans | Multi-Family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 13,904 | [3] | 31,089 |
Total Past Due |  | 18,722 |  | 31,553 |
Current |  | 25,952,907 |  | 23,800,293 |
Non-Covered Loans | Multi-Family | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 4,818 |  | 464 |
Non-Covered Loans | Commercial Real Estate |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 14,920 | [3] | 24,824 |
Total Past Due |  | 15,098 |  | 26,288 |
Current |  | 7,842,106 |  | 7,608,032 |
Non-Covered Loans | Commercial Real Estate | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | 178 |  | 1,464 |
Non-Covered Loans | One-to-four family |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 12,259 | [3] | 11,032 |
Total Past Due |  | 13,376 |  | 14,118 |
Current |  | 103,465 |  | 124,797 |
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 |  | 1,117 |  | 3,086 |
Non-Covered Loans | Acquisition, Development and Construction |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 27 | [3] | 654 |
Total Past Due |  | 27 |  | 654 |
Current |  | 311,649 |  | 257,462 |
Non-Covered Loans | Commercial and Industrial |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual | [2] | 4,473 | [3] | 8,382 |
Total Past Due | [2] | 4,473 |  | 8,912 |
Current | [2] | 1,446,083 |  | 1,100,309 |
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] |  |  | 530 |
Non-Covered Loans | Other |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Non- Accrual |  | 1,242 | [3] | 969 |
Total Past Due |  | 1,734 |  | 1,617 |
Current |  | 22,505 |  | 30,326 |
Non-Covered Loans | Other | Financing Receivable, 30-89 Days Past Due |  |  |  |  |
Financing Receivable, Recorded Investment, Past Due [Line Items] |  |  |  |  |
Total Past Due |  | $ 492 |  | $ 648 |
[1] | Includes lease financing receivables, all of which were classified as "pass."
[2] | Includes lease financing receivables, all of which were current.
[3] | Excludes $969,000 of non-covered PCI loans that were 90 days or more past due.

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- Definition Financing receivables that are current. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 7A -URI http://asc.fasb.org/extlink&oid=49124121&loc=SL6953401-111524 + Details
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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=28367877&loc=d3e4428-111522 + Details
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