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Non-Covered Loan Portfolio by Credit Quality Indicator (Detail) - USD ($) $ in Thousands		Dec. 31, 2019	Dec. 31, 2018
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		$ 41,844,019	$ 40,133,861
Multi-Family
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		31,158,672	29,883,919
Multi-Family | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		30,903,657	29,548,242
Multi-Family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		239,664	312,025
Multi-Family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		15,351	23,652
Commercial Real Estate
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		7,081,910	6,998,834
Commercial Real Estate | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		6,902,218	6,880,105
Commercial Real Estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		104,648	90,653
Commercial Real Estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		75,044	28,076
One-to-four family
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		380,361	446,094
One-to-four family | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		377,883	444,443
One-to-four family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		748
One-to-four family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		1,730	1,651
Acquisition, development, and construction
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		200,596	407,870
Acquisition, development, and construction | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		158,751	319,001
Acquisition, development, and construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		41,456	73,964
Acquisition, development, and construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		389	14,905
Mortgage Receivable
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		38,821,539	37,736,717
Mortgage Receivable | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		38,342,509	37,191,791
Mortgage Receivable | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		386,516	476,642
Mortgage Receivable | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		92,514	68,284
Commercial and Industrial
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans	[1]	3,014,378	2,388,420
Commercial and Industrial | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		2,960,557	2,306,563
Commercial and Industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		1,588	19,751
Commercial and Industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		52,233	62,106
Other
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		8,102	8,724
Other | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		7,850	8,469
Other | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		252	255
Total Other Loans
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		3,022,480	2,397,144
Total Other Loans | Pass
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		2,968,407	2,315,032
Total Other Loans | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		1,588	19,751
Total Other Loans | Substandard
Financing Receivable, Recorded Investment [Line Items]
Non-Covered Loans		$ 52,485	$ 62,361
[1] Includes specialty finance loans and leases of $0.0 billion and $1.9 billion, respectively, at December 30, 2019 and 2018. Other C&I loans of $000.0 million and $469.9 million, respectively, at December 30, 2019 and 2018.

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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=118952595&loc=d3e4428-111522

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