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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 | 1 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2022 | Dec. 31, 2024 | Dec. 31, 2023 | Dec. 31, 2022
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Purchases |  | $ 198,393 | $ 757,188 | $ 483,980
Sales |  | $ 77,306 | $ 535,832 | $ 536,920
Loans held-for-investment, purchase price as a percentage of loans outstanding |  | 97.50% | 87.90% | 99.10%
Loss on sale of loans |  |  |  | $ 23,500
Loss on sale of capital call lines of credit |  | $ 0 | $ (5,037) | 0
Carrying value of consumer loans sold | $ 521,800 |  |  |
Proceeds from sale of finance receivables |  |  |  | 100,700
Investment securities held to maturity |  | 991,937 | 1,103,170 |
Net gain (loss) on sale of loans and leases |  | (400) | 200 | 3,200
Variable Interest Entity, Not Primary Beneficiary |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Proceeds from sale of finance receivables |  | 40,200 | 115,100 |
Investment securities held to maturity |  | 160,000 | 436,800 | 400,000
Specialized lending |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Purchases |  | 0 | 631,252 | 0
Sales |  | 0 | 287,185 | 2,200
Capital calls lines of credit |  |  | 670,000 |
Specialized lending | Loans Held-for-Investment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Capital calls lines of credit |  |  | 280,700 |
Specialized 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 |  | 9,019 | 22,073 | 2,975
Sales |  | 23,708 | 54,083 | 22,880
Multifamily |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Sales |  | 0 | 0 | 2,879
Commercial real estate owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Purchases |  | 0 | 2,867 | 0
Sales |  | 0 | 24,522 | 8,960
Commercial real estate non-owner occupied |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Sales |  | 0 | 16,000 | 0
Residential real estate |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Purchases |  | 0 | 4,238 | 207,251
Personal installment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Purchases |  | 189,374 | 0 | 123,785
Sales |  | 53,598 | 0 | 500,001
Other installment |  |  |  |
Accounts, Notes, Loans and Financing Receivable [Line Items] |  |  |  |
Purchases |  | 0 | 96,758 | 149,969
Sales |  | $ 0 | $ 154,042 | $ 0

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