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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 | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | $ 7,267,246 | $ 7,138,498
Pass/Satisfactory |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 6,215,716 | 6,181,911
Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 113,574 | 126,180
Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 81,959 | 110,080
Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 836,666 | 700,664
Non-performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 19,331 | 19,663
Multi-family |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 3,212,312 | 3,285,297
Multi-family | Pass/Satisfactory |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 3,164,722 | 3,201,822
Multi-family | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 40,441 | 55,696
Multi-family | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 7,149 | 27,779
Multi-family | Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Multi-family | Non-performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Commercial and industrial |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 1,455,592 | 1,373,800
Commercial and industrial | Pass/Satisfactory |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 1,395,034 | 1,306,466
Commercial and industrial | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 30,575 | 30,551
Commercial and industrial | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 29,983 | 36,783
Commercial and industrial | Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Commercial and industrial | Non-performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Commercial real estate owner occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 582,637 | 577,477
Commercial real estate owner occupied | Pass/Satisfactory |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 565,631 | 562,639
Commercial real estate owner occupied | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 12,300 | 9,730
Commercial real estate owner occupied | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 4,706 | 5,108
Commercial real estate owner occupied | Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Commercial real estate owner occupied | Non-performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Commercial real estate non-owner occupied |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 1,107,336 | 1,125,106
Commercial real estate non-owner occupied | Pass/Satisfactory |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 1,036,957 | 1,054,493
Commercial real estate non-owner occupied | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 30,258 | 30,203
Commercial real estate non-owner occupied | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 40,121 | 40,410
Commercial real estate non-owner occupied | Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Commercial real estate non-owner occupied | Non-performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Construction |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 53,372 | 56,491
Construction | Pass/Satisfactory |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 53,372 | 56,491
Construction | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Construction | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Construction | Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Construction | Non-performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Residential real estate |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 625,066 | 566,561
Residential real estate | Pass/Satisfactory |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Residential real estate | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Residential real estate | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Residential real estate | Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 613,880 | 555,016
Residential real estate | Non-performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 11,186 | 11,545
Manufactured housing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 77,778 | 79,731
Manufactured housing | Pass/Satisfactory |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Manufactured housing | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Manufactured housing | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Manufactured housing | Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 70,232 | 71,924
Manufactured housing | Non-performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 7,546 | 7,807
Other |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 153,153 | 74,035
Other | Pass/Satisfactory |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Other | Special Mention |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Other | Substandard |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 0 | 0
Other | Performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | 152,554 | 73,724
Other | Non-performing |  |
Financing Receivable, Recorded Investment [Line Items] |  |
Loans and lease receivable, gross | $ 599 | $ 311

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