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Loans Receivable and Allowance for Loan Losses - Credit Ratings of Covered and Non-Covered Loan Portfolio (Detail) - USD ($) $ in Thousands | Mar. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 6,944,266 | $ 6,768,175
Pass/Satisfactory |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 6,514,558 | 6,300,595
Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 66,949 | 99,279
Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 45,663 | 40,437
Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 299,049 | 305,939
Non-performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 18,047 | 21,925
Multi-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 3,645,374 | 3,502,381
Multi-family | Pass/Satisfactory |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 3,608,179 | 3,438,554
Multi-family | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 29,634 | 53,873
Multi-family | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 7,561 | 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 | 1,202,641 | 1,149,090
Commercial and industrial | Pass/Satisfactory |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,161,401 | 1,118,889
Commercial and industrial | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 12,751 | 7,652
Commercial and industrial | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 28,489 | 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 | 502,150 | 484,728
Commercial real estate - owner occupied | Pass/Satisfactory |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 485,423 | 471,826
Commercial real estate - owner occupied | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 8,208 | 5,987
Commercial real estate - owner occupied | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 8,519 | 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 | 1,195,904 | 1,218,719
Commercial real estate - non-owner occupied | Pass/Satisfactory |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,178,454 | 1,185,933
Commercial real estate - non-owner occupied | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 16,356 | 31,767
Commercial real estate - non-owner occupied | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 1,094 | 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 | 81,101 | 85,393
Construction | Pass/Satisfactory |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 81,101 | 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 | 225,839 | 234,090
Residential real estate | Pass/Satisfactory |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 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 |
Residential real estate | Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 216,133 | 221,042
Residential real estate | Non-performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 9,706 | 13,048
Manufactured housing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 87,687 | 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 | 79,518 | 81,497
Manufactured housing | Non-performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 8,169 | 8,730
Other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | 3,570 | 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 | 3,398 | 3,400
Other | Non-performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans receivable, gross | $ 172 | $ 147

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