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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, 2018	Dec. 31, 2017
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 7,242,995	$ 6,768,175
Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	6,354,727	6,300,595
Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	128,208	99,279
Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	116,408	40,437
Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	627,956	305,939
Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	15,696	21,925
Multi-family
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	3,504,540	3,502,381
Multi-family | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	3,399,892	3,438,554
Multi-family | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	81,253	53,873
Multi-family | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	23,395	9,954
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	1,286,090	1,149,090
Commercial and industrial | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,235,945	1,118,889
Commercial and industrial | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	7,756	7,652
Commercial and industrial | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	42,389	22,549
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	555,614	484,728
Commercial real estate owner occupied | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	539,252	471,826
Commercial real estate owner occupied | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	8,793	5,987
Commercial real estate owner occupied | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	7,569	6,915
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	1,157,849	1,218,719
Commercial real estate non-owner occupied | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	1,084,388	1,185,933
Commercial real estate non-owner occupied | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	30,406	31,767
Commercial real estate non-owner occupied | Substandard
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	43,055	1,019
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	95,250	85,393
Construction | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	95,250	85,393
Construction | Special Mention
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
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	509,853	234,090
Residential real estate | Pass/Satisfactory
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	0	0
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	0	0
Residential real estate | Performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	502,010	221,042
Residential real estate | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	7,843	13,048
Manufactured housing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	82,589	90,227
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	74,893	81,497
Manufactured housing | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	7,696	8,730
Other
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	51,210	3,547
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	51,053	3,400
Other | Non-performing
Financing Receivable, Recorded Investment [Line Items]
Loans receivable, gross	$ 157	$ 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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