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Loan Portfolio by Credit Quality Indicator (Detail) - USD ($) $ in Thousands		Sep. 30, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		$ 39,806,031	$ 38,359,022
Multi-Family
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		29,546,399	28,074,709
Multi-Family | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		29,176,497	27,874,330
Multi-Family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		289,820	125,752
Multi-Family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		80,082	74,627
Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		7,033,629	7,322,226
Commercial Real Estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		6,934,670	7,255,100
Commercial Real Estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		93,168	47,123
Commercial Real Estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		5,791	20,003
One-to-four family
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		456,317	477,228
One-to-four family | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		451,012	471,571
One-to-four family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		2,723	3,691
One-to-four family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		2,582	1,966
Acquisition, Development and Construction
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		433,976	435,825
Acquisition, Development and Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		343,134	344,040
Acquisition, Development and Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		81,290	76,033
Acquisition, Development and Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		9,552	15,752
Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		37,470,321	36,309,988
Mortgage Receivable | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		36,905,313	35,945,041
Mortgage Receivable | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		467,001	252,599
Mortgage Receivable | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		98,007	112,348
Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	2,326,679	2,040,574
Commercial and Industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	2,224,744	1,925,527
Commercial and Industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	33,202	20,883
Commercial and Industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	68,733	94,164
Other
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		9,031	8,460
Other | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		9,018	8,449
Other | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		13	11
Total Other Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		2,335,710	2,049,034
Total Other Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		2,233,762	1,933,976
Total Other Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		33,202	20,883
Total Other Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		$ 68,746	$ 94,175
[1] Includes lease financing receivables, all of which were classified as Pass.

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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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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