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Loans Receivable and Allowance for Loan Losses - Credit Quality Tables for Loans Receivable Portfolio (Detail) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 7,138,498	$ 6,768,175
Loans receivable, at amortized cost or lower of cost or market	7,138,498	6,768,175
Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	6,181,911	6,300,595
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	126,180	99,279
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	110,080	40,437
Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	700,664	305,939
Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	19,663	21,925
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,285,297	3,502,381
Loans receivable, at amortized cost or lower of cost or market	3,285,297	3,502,381
Multi-family | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	3,201,822	3,438,554
Multi-family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	55,696	53,873
Multi-family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	27,779	9,954
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	1,373,800	1,149,090
Loans receivable, at amortized cost or lower of cost or market	1,373,800	1,149,090
Commercial and industrial | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,306,466	1,118,889
Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	30,551	7,652
Commercial and industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	36,783	22,549
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	577,477	484,728
Loans receivable, at amortized cost or lower of cost or market	577,477	484,728
Commercial real estate owner occupied | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	562,639	471,826
Commercial real estate owner occupied | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	9,730	5,987
Commercial real estate owner occupied | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	5,108	6,915
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	1,125,106	1,218,719
Loans receivable, at amortized cost or lower of cost or market	1,125,106	1,218,719
Commercial real estate non-owner occupied | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	1,054,493	1,185,933
Commercial real estate non-owner occupied | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	30,203	31,767
Commercial real estate non-owner occupied | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	40,410	1,019
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	56,491	85,393
Loans receivable, at amortized cost or lower of cost or market	56,491	85,393
Construction | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	56,491	85,393
Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	0	0
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	566,561	234,090
Loans receivable, at amortized cost or lower of cost or market	566,561	234,090
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	555,016	221,042
Residential real estate | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	11,545	13,048
Manufactured housing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	79,731	90,227
Loans receivable, at amortized cost or lower of cost or market	79,731	90,227
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	71,924	81,497
Manufactured housing | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	7,807	8,730
Other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	74,035	3,547
Loans receivable, at amortized cost or lower of cost or market	74,035	3,547
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	73,724	3,400
Other | Nonperforming
Financing Receivable, Recorded Investment [Line Items]
Loans receivable	$ 311	$ 147

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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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