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Loans Receivable and Allowance for Loan Losses - Credit Ratings of Covered and Non-Covered Loan Portfolio (Detail) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 7,063,775	$ 6,154,561
Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	6,844,002	5,945,115
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	76,991	56,939
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	46,025	47,294
Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	89,231	96,333
Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	7,526	8,880
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	3,618,989	3,214,999
Multi-family | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	3,577,304	3,198,290
Multi-family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	36,604	0
Multi-family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	5,081	16,709
Multi-family | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Multi-family | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,115,222	988,711
Commercial and industrial | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,080,797	954,846
Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	8,663	19,552
Commercial and industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	25,762	14,313
Commercial and industrial | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Commercial and industrial | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Commercial real estate - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	486,567	393,632
Commercial real estate - owner occupied | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	468,389	375,919
Commercial real estate - owner occupied | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	9,716	12,065
Commercial real estate - owner occupied | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	8,462	5,648
Commercial real estate - owner occupied | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Commercial real estate - owner occupied | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Commercial real estate - non-owner occupied
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,237,849	1,193,715
Commercial real estate - non-owner occupied | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,212,945	1,175,850
Commercial real estate - non-owner occupied | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	22,008	10,824
Commercial real estate - non-owner occupied | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	2,896	7,041
Commercial real estate - non-owner occupied | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Commercial real estate - non-owner occupied | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	73,203	64,789
Construction | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	73,203	50,291
Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	14,498
Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Construction | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Construction | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	435,188	193,502
Residential real estate | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	431,364	189,919
Residential real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Residential real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	3,824	3,583
Residential real estate | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Residential real estate | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Manufactured housing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	92,938	101,730
Manufactured housing | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Manufactured housing | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Manufactured housing | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Manufactured housing | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	85,537	92,920
Manufactured housing | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	7,401	8,810
Other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	3,819	3,483
Other | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Other | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Other | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
Other | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	3,694	3,413
Other | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 125	$ 70

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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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