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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
Loans receivable, at amortized cost or lower of cost or market | 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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- Definition Amount before allowance of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Includes deferred interest and fees, undisbursed portion of loan balance, unamortized costs and premiums and discounts from face amounts. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522 + Details
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