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Loans and Leases Receivable and Allowance for Credit Losses on Loans and Leases - Schedule of Loan Purchases and Sales (Details) - USD ($) $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Jun. 30, 2023 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2023 | Sep. 30, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Purchases |  | $ 101,735 | $ 137,814 | $ 750,400 | $ 368,776
Sales |  | $ 12,396 | $ 502,201 | $ 535,832 | $ 536,920
Purchase price as a percentage of loans outstanding |  | 100.00% | 99.90% | 87.70% | 98.70%
Gain (loss) on sale of loans held-for-investment and loans held-for-sale |  | $ (200) |  | $ 200 |
Gain (loss) on sale of SBA and other loans |  | (348) | $ 106 | (1,109) | $ 3,155
Loss on sale of capital call lines of credit |  | 0 | 0 | 5,037 | 0
Carrying value of consumer loans sold |  |  | 521,800 |  | 521,800
Net loss on sale of loans |  |  | 23,500 |  | 23,500
Proceeds from sales of loans and leases |  |  |  | 409,503 | 136,920
Consumer loans |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Proceeds from sales of loans and leases |  |  | 100,700 |  | 100,700
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Asset-backed securities collateralized by loans sold |  |  | 400,000 |  | 400,000
Proceeds from sales of loans and leases | $ 115,100 |  |  |  |
Specialty lending |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Purchases |  | 0 | 0 | 631,252 | 0
Sales |  | 0 | 2,200 | 287,185 | 2,200
Loss on sale of capital call lines of credit |  |  |  | 5,000 |
Capital calls lines of credit |  |  |  | 670,000 |
Specialty lending | Loans Held-for-Investment |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Capital calls lines of credit |  |  |  | 280,700 |
Specialty lending | Unfunded Loan Commitment |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Capital calls lines of credit |  |  |  | 389,300 |
Other commercial and industrial |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Purchases |  | 4,977 | 0 | 15,285 | 0
Sales |  | 6,725 | 0 | 54,083 | 22,880
Commercial real estate owner occupied |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Purchases |  | 0 | 0 | 2,867 | 0
Sales |  | 5,671 | 0 | 24,522 | 8,960
Residential real estate |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Purchases |  | 0 | 15,067 | 4,238 | 170,022
Personal installment |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Purchases |  | 0 | 47,778 | 0 | 123,785
Sales |  | 0 | 500,001 | 0 | 500,001
Multifamily |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Sales |  | 0 | 0 | 0 | 2,879
Commercial real estate non-owner occupied |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Sales |  | 0 | 0 | 16,000 | 0
Other |  |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |  |
Purchases |  | 96,758 | 74,969 | 96,758 | 74,969
Sales |  | $ 0 | $ 0 | $ 154,042 | $ 0

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