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Loans Receivable and Allowance for Loan Losses - Schedule of Loans Receivable (Detail) - USD ($) $ in Thousands | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2016
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 7,181,084 |  | $ 6,768,175 |  |  |
Deferred costs and unamortized premiums, net | 642 |  | 83 |  |  |
Allowance for loan losses | (38,288) | $ (39,499) | (38,015) | $ (38,458) | $ (39,883) | $ (37,315)
Total loans receivable, net of allowance for loan losses | 7,143,438 |  | 6,730,243 |  |  |
Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | 3,542,770 |  | 3,502,381 |  |  |
Allowance for loan losses | (12,069) | (12,545) | (12,168) | (12,028) | (12,283) | (11,602)
Total loans receivable, net of allowance for loan losses |  |  |  |  | 94,900 |
Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | 88,141 |  | 85,393 |  |  |
Allowance for loan losses | (992) | (921) | (979) | (716) | (885) | (840)
Residential real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | 493,222 |  | 234,090 |  |  |
Allowance for loan losses | (2,908) | (3,179) | (2,929) | (2,995) | (3,080) | (3,342)
Manufactured housing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | 85,328 |  | 90,227 |  |  |
Allowance for loan losses | (149) | (176) | (180) | (268) | (284) | (286)
Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | 3,874 |  | 3,547 |  |  |
Allowance for loan losses | (226) | $ (183) | (172) | $ (104) | $ (101) | $ (118)
Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | 6,598,660 |  | 6,440,311 |  |  |
Commercial | Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | 3,542,770 |  | 3,502,381 |  |  |
Commercial | Commercial and industrial (including owner occupied commercial real estate) |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | 1,811,751 |  | 1,633,818 |  |  |
Commercial | Commercial real estate non-owner occupied |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | 1,155,998 |  | 1,218,719 |  |  |
Commercial | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | 88,141 |  | 85,393 |  |  |
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | 582,424 |  | 327,864 |  |  |
Consumer | Residential real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | 493,222 |  | 234,090 |  |  |
Consumer | Manufactured housing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | 85,328 |  | 90,227 |  |  |
Consumer | Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, gross | $ 3,874 |  | $ 3,547 |  |  |

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