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Loans and Leases Receivable and Allowance for Loan and Lease Losses - Credit Ratings of Covered and Non-Covered Loan Portfolio (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | $ 7,715,769 | $ 7,138,498
Pass/Satisfactory |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 6,252,305 | 6,181,911
Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 114,524 | 126,180
Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 71,644 | 110,080
Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 1,260,358 | 700,664
Non-performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 16,938 | 19,663
Multi-family |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 3,017,531 | 3,285,297
Multi-family | Pass/Satisfactory |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 2,969,263 | 3,201,822
Multi-family | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 43,147 | 55,696
Multi-family | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 5,121 | 27,779
Multi-family | Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Multi-family | Non-performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Commercial and industrial |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 1,598,470 | 1,373,800
Commercial and industrial | Pass/Satisfactory |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 1,545,879 | 1,306,466
Commercial and industrial | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 29,473 | 30,551
Commercial and industrial | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 23,118 | 36,783
Commercial and industrial | Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Commercial and industrial | Non-performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Commercial real estate owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 586,086 | 577,477
Commercial real estate owner occupied | Pass/Satisfactory |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 568,720 | 562,639
Commercial real estate owner occupied | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 11,853 | 9,730
Commercial real estate owner occupied | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 5,513 | 5,108
Commercial real estate owner occupied | Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Commercial real estate owner occupied | Non-performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Commercial real estate non-owner occupied |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 1,176,575 | 1,125,106
Commercial real estate non-owner occupied | Pass/Satisfactory |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 1,108,632 | 1,054,493
Commercial real estate non-owner occupied | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 30,051 | 30,203
Commercial real estate non-owner occupied | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 37,892 | 40,410
Commercial real estate non-owner occupied | Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Commercial real estate non-owner occupied | Non-performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Construction |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 59,811 | 56,491
Construction | Pass/Satisfactory |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 59,811 | 56,491
Construction | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Construction | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Construction | Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Construction | Non-performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Residential real estate |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 648,860 | 566,561
Residential real estate | Pass/Satisfactory |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Residential real estate | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Residential real estate | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Residential real estate | Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 641,166 | 555,016
Residential real estate | Non-performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 7,694 | 11,545
Manufactured housing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 75,597 | 79,731
Manufactured housing | Pass/Satisfactory |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Manufactured housing | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Manufactured housing | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Manufactured housing | Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 68,192 | 71,924
Manufactured housing | Non-performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 7,405 | 7,807
Other consumer |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 552,839 | 74,035
Other consumer | Pass/Satisfactory |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Other consumer | Special Mention |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Other consumer | Substandard |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Other consumer | Performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | 551,000 | 73,724
Other consumer | Non-performing |  |
Financing Receivable, Credit Quality Indicator [Line Items] |  |
Loans and lease receivable, gross | $ 1,839 | $ 311

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