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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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