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Non-Covered Loan Portfolio by Credit Quality Indicator (Detail) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		$ 38,359,022	$ 37,356,201
Multi-Family
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		28,074,709	26,945,052
Multi-Family | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		27,874,330	26,754,622
Multi-Family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		125,752	164,325
Multi-Family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		74,627	26,105
Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		7,322,226	7,724,362
Commercial Real Estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		7,255,100	7,701,773
Commercial Real Estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		47,123	12,604
Commercial Real Estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		20,003	9,985
One-to-four family
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		477,228	381,081
One-to-four family | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		471,571	371,179
One-to-four family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		3,691
One-to-four family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		1,966	9,902
Acquisition, Development and Construction
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		435,825	381,194
Acquisition, Development and Construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		344,040	341,784
Acquisition, Development and Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		76,033	33,210
Acquisition, Development and Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		15,752	6,200
Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		36,309,988	35,431,689
Mortgage Receivable | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		35,945,041	35,169,358
Mortgage Receivable | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		252,599	210,139
Mortgage Receivable | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		112,348	52,192
Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	2,040,574	1,900,445
Commercial and Industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	1,925,527	1,771,975
Commercial and Industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	20,883	54,979
Commercial and Industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	94,164	73,491
Other
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		8,460	18,305
Other | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		8,449	16,992
Other | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		11	1,313
Total Other Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		2,049,034	1,918,750
Total Other Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		1,933,976	1,788,967
Total Other Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		20,883	54,979
Total Other Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		$ 94,175	$ 74,804
[1] (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://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=82891408&loc=d3e4428-111522

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