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Loans and Leases Receivable and Allowance for Loan and Lease Losses - Schedule of Loans and Leases Receivable (Detail) - USD ($) $ in Thousands | Sep. 30, 2019 | Jun. 30, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | --- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | $ 7,336,237 |  | $ 7,138,074 |  |  |
Loans and lease receivable, gross | 7,338,555 |  | 7,138,498 |  |  |
Deferred (fees) costs and unamortized (discounts) premiums, net | (2,318) |  | (424) |  |  |
Allowance for loan and lease losses | (51,053) | $ (48,388) | (39,972) | $ (40,741) | $ (38,288) | $ (38,015)
Loans and leases receivable, net of allowance for loan and lease losses | 9,723,714 |  | 8,503,522 |  |  |
Mortgage Warehouse |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 2,438,530 |  | 1,405,420 |  |  |
Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and lease receivable, gross | 2,300,244 |  | 3,285,297 |  |  |
Allowance for loan and lease losses | (7,498) | (9,926) | (11,462) | (11,829) | (12,069) | (12,168)
Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and lease receivable, gross | 61,200 |  | 56,491 |  |  |
Allowance for loan and lease losses | (658) | (649) | (624) | (1,062) | (992) | (979)
Residential real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and lease receivable, gross | 628,786 |  | 566,561 |  |  |
Allowance for loan and lease losses | (4,083) | (4,168) | (3,654) | (3,901) | (2,908) | (2,929)
Manufactured housing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and lease receivable, gross | 72,616 |  | 79,731 |  |  |
Allowance for loan and lease losses | (1,027) | (123) | (145) | (94) | (149) | (180)
Other consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and lease receivable, gross | 643,553 |  | 74,035 |  |  |
Allowance for loan and lease losses | (12,582) | $ (10,267) | (2,529) | $ (1,540) | $ (226) | $ (172)
Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and lease receivable, gross | 5,993,600 |  | 6,418,171 |  |  |
Commercial | Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and lease receivable, gross | 2,300,244 |  | 3,285,297 |  |  |
Commercial | Commercial and industrial (including owner occupied commercial real estate) |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and lease receivable, gross | 2,363,599 |  | 1,951,277 |  |  |
Commercial | Commercial real estate non-owner occupied |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and lease receivable, gross | 1,268,557 |  | 1,125,106 |  |  |
Commercial | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and lease receivable, gross | 61,200 |  | 56,491 |  |  |
Commercial | Direct Finance Equipment Leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and lease receivable, gross | 75,200 |  | 54,500 |  |  |
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and lease receivable, gross | 1,344,955 |  | 720,327 |  |  |
Consumer | Residential real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and lease receivable, gross | 628,786 |  | 566,561 |  |  |
Consumer | Manufactured housing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and lease receivable, gross | 72,616 |  | 79,731 |  |  |
Consumer | Other consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and lease receivable, gross | $ 643,553 |  | $ 74,035 |  |  |

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