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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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