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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 | Sep. 30, 2023 | Jun. 30, 2023 | Dec. 31, 2022 | Sep. 30, 2022 | Jun. 30, 2022 | Dec. 31, 2021
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Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans receivable, mortgage warehouse, at fair value | $ 962,566 |  | $ 1,323,312 |  |  |
Loans receivable, PPP | 137,063 |  | 998,153 |  |  |
Loans and leases receivable | 12,463,485 |  | 13,144,894 |  |  |
Allowance for credit losses on loans and leases | (139,213) | $ (139,656) | (130,924) | $ (130,197) | $ (156,530) | $ (137,804)
Total loans and leases receivable, net of allowance for credit losses on loans and leases | 13,423,901 |  | 15,335,435 |  |  |
Deferred (fees) costs and unamortized (discounts) premiums, net | (35,800) |  | (21,500) |  |  |
Multifamily |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 2,130,213 |  | 2,213,019 |  |  |
Allowance for credit losses on loans and leases | (15,870) | (15,400) | (14,541) | (14,244) | (9,765) | (4,477)
Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 252,588 |  | 162,009 |  |  |
Allowance for credit losses on loans and leases | (3,130) | (2,639) | (1,913) | (1,614) | (1,179) | (692)
Residential real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 483,133 |  | 497,952 |  |  |
Allowance for credit losses on loans and leases | (6,802) | (6,846) | (6,094) | (5,453) | (5,578) | (2,383)
Manufactured housing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 40,129 |  | 45,076 |  |  |
Allowance for credit losses on loans and leases | (4,080) | $ (4,338) | (4,430) | $ (4,482) | $ (4,080) | $ (4,278)
Commercial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 10,973,327 |  | 11,223,927 |  |  |
Commercial | Specialty lending |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 5,422,161 |  | 5,412,887 |  |  |
Commercial | Other commercial and industrial |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 1,195,347 |  | 1,259,943 |  |  |
Commercial | Multifamily |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 2,130,213 |  | 2,213,019 |  |  |
Commercial | Commercial real estate owner occupied |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 794,815 |  | 885,339 |  |  |
Commercial | Commercial real estate non-owner occupied |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 1,178,203 |  | 1,290,730 |  |  |
Commercial | Construction |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 252,588 |  | 162,009 |  |  |
Commercial | Direct finance equipment leases |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 193,800 |  | 157,400 |  |  |
Consumer |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 1,490,158 |  | 1,920,967 |  |  |
Consumer | Residential real estate |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 483,133 |  | 497,952 |  |  |
Consumer | Manufactured housing |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 40,129 |  | 45,076 |  |  |
Consumer | Personal |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | 629,843 |  | 964,641 |  |  |
Consumer | Other |  |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |  |
Loans and leases receivable | $ 337,053 |  | $ 413,298 |  |  |

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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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