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Non-Covered Loan Portfolio by Credit Quality Indicator (Detail) - USD ($) $ in Thousands		Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		$ 40,133,861	$ 38,359,022
Multi-Family
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		29,883,919	28,074,709
Multi-Family | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		29,548,242	27,874,330
Multi-Family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		312,025	125,752
Multi-Family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		23,652	74,627
Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		6,998,834	7,322,226
Commercial Real Estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		6,880,105	7,255,100
Commercial Real Estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		90,653	47,123
Commercial Real Estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		28,076	20,003
One-to-four family
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		446,094	477,228
One-to-four family | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		444,443	471,571
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		1,651	1,966
Acquisition, development, and construction
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		407,870	435,825
Acquisition, development, and construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		319,001	344,040
Acquisition, development, and construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		73,964	76,033
Acquisition, development, and construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		14,905	15,752
Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		37,736,717	36,309,988
Mortgage Receivable | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		37,191,791	35,945,041
Mortgage Receivable | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		476,642	252,599
Mortgage Receivable | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		68,284	112,348
Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	2,388,420	2,040,574
Commercial and Industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	2,306,563	1,925,527
Commercial and Industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	19,751	20,883
Commercial and Industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	62,106	94,164
Other
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		8,724	8,460
Other | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		8,469	8,449
Other | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		255	11
Total Other Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		2,397,144	2,049,034
Total Other Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		2,315,032	1,933,976
Total Other Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		19,751	20,883
Total Other Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		$ 62,361	$ 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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