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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 | Jun. 30, 2021 | Mar. 31, 2021 | Dec. 31, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, mortgage warehouse, at fair value | $ 2,855,284 |  | $ 3,616,432 |  |  |
Loans receivable, PPP | 6,305,056 |  | 4,561,365 |  |  |
Loans and leases receivable | 7,772,142 |  | 7,575,368 |  |  |
Allowance for credit losses on loans and leases | (125,436) | $ (128,736) | (144,176) | $ (159,905) | $ (149,283) | $ (56,379)
Total loans and leases receivable, net of allowance for credit losses on loans and leases | 16,807,046 |  | 15,608,989 |  |  |
Deferred (fees) costs and unamortized (discounts) premiums, net | (223,100) |  | (54,600) |  |  |
Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 1,497,485 |  | 1,761,301 |  |  |
Allowance for credit losses on loans and leases | (5,028) | (8,026) | (12,620) | (14,697) | (8,750) | (6,157)
Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 179,198 |  | 140,905 |  |  |
Allowance for credit losses on loans and leases | (2,643) | (4,103) | (5,871) | (5,297) | (1,934) | (1,262)
Residential real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 266,911 |  | 317,170 |  |  |
Allowance for credit losses on loans and leases | (2,299) | (3,209) | (3,977) | (4,550) | (4,180) | (3,218)
Manufactured housing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 57,904 |  | 62,243 |  |  |
Allowance for credit losses on loans and leases | (4,372) | (4,800) | (5,190) | (6,014) | (4,987) | (1,060)
Installment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 1,549,693 |  | 1,235,406 |  |  |
Allowance for credit losses on loans and leases | (91,129) | $ (83,539) | (75,315) | $ (79,147) | $ (83,569) | $ (20,648)
Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 5,897,634 |  | 5,960,549 |  |  |
Commercial | Multi-family |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 1,497,485 |  | 1,761,301 |  |  |
Commercial | Commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 2,360,656 |  | 2,289,441 |  |  |
Commercial | Commercial real estate owner occupied |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 653,649 |  | 572,338 |  |  |
Commercial | Commercial real estate non-owner occupied |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 1,206,646 |  | 1,196,564 |  |  |
Commercial | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 179,198 |  | 140,905 |  |  |
Commercial | Direct Finance Equipment Leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 129,000 |  | 108,000 |  |  |
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 1,874,508 |  | 1,614,819 |  |  |
Consumer | Residential real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 266,911 |  | 317,170 |  |  |
Consumer | Manufactured housing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 57,904 |  | 62,243 |  |  |
Consumer | Installment |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | $ 1,549,693 |  | $ 1,235,406 |  |  |

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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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