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Loans Receivable and Allowance for Loan Losses - Credit Ratings of Covered and Non-Covered Loan Portfolio (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 7,181,084 | $ 6,768,175
Pass/Satisfactory |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 6,405,308 | 6,300,595
Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 117,075 | 99,279
Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 76,277 | 40,437
Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 566,841 | 305,939
Non-performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 15,583 | 21,925
Multi-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 3,542,770 | 3,502,381
Multi-family | Pass/Satisfactory |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 3,485,669 | 3,438,554
Multi-family | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 31,001 | 53,873
Multi-family | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 26,100 | 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 | 1,266,520 | 1,149,090
Commercial and industrial | Pass/Satisfactory |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,211,934 | 1,118,889
Commercial and industrial | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 16,979 | 7,652
Commercial and industrial | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 37,607 | 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 | 545,231 | 484,728
Commercial real estate - owner occupied | Pass/Satisfactory |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 529,898 | 471,826
Commercial real estate - owner occupied | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 8,152 | 5,987
Commercial real estate - owner occupied | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 7,181 | 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 | 1,155,998 | 1,218,719
Commercial real estate - non-owner occupied | Pass/Satisfactory |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,089,666 | 1,185,933
Commercial real estate - non-owner occupied | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 60,943 | 31,767
Commercial real estate - non-owner occupied | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 5,389 | 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 | 88,141 | 85,393
Construction | Pass/Satisfactory |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 88,141 | 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 | 493,222 | 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 | 485,442 | 221,042
Residential real estate | Non-performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 7,780 | 13,048
Manufactured housing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 85,328 | 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 | 77,675 | 81,497
Manufactured housing | Non-performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 7,653 | 8,730
Other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 3,874 | 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 | 3,724 | 3,400
Other | Non-performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 150 | $ 147

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