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Loans and Leases Receivable and Allowance for Credit Losses - Schedule of Loans and Leases Receivable (Detail) - USD ($) $ in Thousands | Dec. 31, 2020 | Jan. 01, 2020 | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | --- | --- | ---
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable, mortgage warehouse, at fair value | $ 3,616,432 |  | $ 2,245,758 |
Loans receivable, PPP | 4,561,365 |  | 0 |
Loans and leases receivable | 7,575,368 |  | 7,318,988 |
Allowance for credit losses on loans and leases | (144,176) | $ (136,200) | (56,379) | $ (39,972)
Total loans and leases receivable, net of allowance for credit losses on loans and leases | 15,608,989 |  | 9,508,367 |
Deferred (fees) costs and unamortized (discounts) premiums, net | (54,600) |  | 2,100 |
Multi-family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 1,761,301 |  |  |
Allowance for credit losses on loans and leases | (12,620) |  | (6,157) | (11,462)
Commercial real estate owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 572,338 |  |  |
Allowance for credit losses on loans and leases | (9,512) |  | (2,235) | (3,320)
Commercial real estate non-owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 1,196,564 |  |  |
Allowance for credit losses on loans and leases | (19,452) |  | (6,243) | (6,093)
Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 140,905 |  |  |
Allowance for credit losses on loans and leases | (5,871) |  | (1,262) | (624)
Residential real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 317,170 |  |  |
Allowance for credit losses on loans and leases | (3,977) |  | (3,218) | (3,654)
Manufactured housing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 62,243 |  |  |
Allowance for credit losses on loans and leases | (5,190) |  | (1,060) | $ (145)
Installment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 1,235,406 |  |  |
Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 5,960,549 |  | 5,690,820 |
Commercial | Multi-family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 1,761,301 |  | 1,907,331 |
Commercial | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 2,289,441 |  | 1,891,152 |
Commercial | Commercial real estate owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 572,338 |  | 551,948 |
Commercial | Commercial real estate non-owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 1,196,564 |  | 1,222,772 |
Commercial | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 140,905 |  | 117,617 |
Commercial | Direct finance equipment leases |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 108,000 |  | 89,200 |
Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 1,614,819 |  | 1,628,168 |
Consumer | Residential real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 317,170 |  | 382,634 |
Consumer | Manufactured housing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 62,243 |  | 71,359 |
Consumer | Installment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | $ 1,235,406 |  | $ 1,174,175 |

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