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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Schedule of Loans and Leases Receivable (Detail) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021 | Mar. 31, 2021 | Dec. 31, 2020
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans receivable, mortgage warehouse, at fair value | $ 1,755,758 | $ 2,284,325 |  |
Loans receivable, PPP | 2,195,902 | 3,250,008 |  |
Loans and leases receivable | 10,118,855 | 9,018,298 |  |
Allowance for credit losses on loans and leases | (145,847) | (137,804) | $ (128,736) | $ (144,176)
Total loans and leases receivable, net of allowance for credit losses on loans and leases | 13,924,668 | 14,414,827 |  |
Deferred (fees) costs and unamortized (discounts) premiums, net | (22,800) | (52,000) |  |
Multi-family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 1,705,027 | 1,486,308 |  |
Allowance for credit losses on loans and leases | (7,437) | (4,477) | (8,026) | (12,620)
Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 161,024 | 198,981 |  |
Allowance for credit losses on loans and leases | (939) | (692) | (4,103) | (5,871)
Residential real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 466,423 | 334,730 |  |
Allowance for credit losses on loans and leases | (4,685) | (2,383) | (3,209) | (3,977)
Manufactured housing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 50,669 | 52,861 |  |
Allowance for credit losses on loans and leases | (4,342) | (4,278) | (4,800) | (5,190)
Installment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 1,897,706 | 1,744,475 |  |
Allowance for credit losses on loans and leases | (107,883) | (103,849) | $ (83,539) | $ (75,315)
Commercial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 7,704,057 | 6,886,232 |  |
Commercial | Multi-family |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 1,705,027 | 1,486,308 |  |
Commercial | Commercial and industrial |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 3,995,802 | 3,424,783 |  |
Commercial | Commercial real estate owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 701,893 | 654,922 |  |
Commercial | Commercial real estate non-owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 1,140,311 | 1,121,238 |  |
Commercial | Construction |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 161,024 | 198,981 |  |
Commercial | Direct Finance Equipment Leases |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 150,700 | 146,500 |  |
Consumer |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 2,414,798 | 2,132,066 |  |
Consumer | Residential real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 466,423 | 334,730 |  |
Consumer | Manufactured housing |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | 50,669 | 52,861 |  |
Consumer | Installment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Loans and leases receivable | $ 1,897,706 | $ 1,744,475 |  |

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- Definition Loans receivable mortgage warehouse, carrying amount of loans made to mortgage companies under master lending agreements, usually in the form of a revolving line of credit used by the borrower to originate and purchase and sell mortgage loans. + References No definition available. + Details
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