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Loans Receivable and Allowance for Loan Losses - Credit Quality Tables for Loans Receivable Portfolio (Detail) - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 6,768,175	$ 6,154,561
Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	6,300,595	5,755,196
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	99,279	56,939
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	40,437	43,711
Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	305,939	286,252
Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	21,925	12,463
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,502,381	3,214,999
Multi-family | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,438,554	3,198,290
Multi-family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	53,873	0
Multi-family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	9,954	16,709
Multi-family | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Multi-family | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial and industrial
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,149,090	988,711
Commercial and industrial | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,118,889	954,846
Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	7,652	19,552
Commercial and industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	22,549	14,313
Commercial and industrial | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial and industrial | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial real estate - owner occupied
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	484,728	393,632
Commercial real estate - owner occupied | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	471,826	375,919
Commercial real estate - owner occupied | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	5,987	12,065
Commercial real estate - owner occupied | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	6,915	5,648
Commercial real estate - owner occupied | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial real estate - owner occupied | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial real estate - non-owner occupied
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,218,719	1,193,715
Commercial real estate - non-owner occupied | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,185,933	1,175,850
Commercial real estate - non-owner occupied | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	31,767	10,824
Commercial real estate - non-owner occupied | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,019	7,041
Commercial real estate - non-owner occupied | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Commercial real estate - non-owner occupied | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Construction
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	85,393	64,789
Construction | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	85,393	50,291
Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	14,498
Construction | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Construction | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Construction | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Residential real estate
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	234,090	193,502
Residential real estate | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Residential real estate | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Residential real estate | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Residential real estate | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	221,042	189,919
Residential real estate | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	13,048	3,583
Manufactured housing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	90,227	101,730
Manufactured housing | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Manufactured housing | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Manufactured housing | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Manufactured housing | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	81,497	92,920
Manufactured housing | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	8,730	8,810
Other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,547	3,483
Other | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Other | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Other | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
Other | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,400	3,413
Other | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 147	$ 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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