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v3.23.3

Investment Securities - Additional Information (Detail) |  | 3 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Jun. 30, 2023 USD ($) | Sep. 30, 2023 USD ($) security corporateNote assetBackedSecurity | Jun. 30, 2023 USD ($) | Sep. 30, 2022 USD ($) assetBackedSecurity | Sep. 30, 2023 USD ($) security corporateNote assetBackedSecurity | Sep. 30, 2022 USD ($) assetBackedSecurity | Dec. 31, 2022 USD ($) security
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Proceeds from sales of investment securities available for sale |  | $ 4,100,000 |  | $ 126,600,000 | $ 4,075,000 | $ 681,633,000 |
Number of available-for-sale investment securities, unrealized loss position, less than twelve month category | security |  | 25 |  |  | 25 |  |
Number of available-for-sale investment securities, unrealized loss position, twelve month or more category | security |  | 155 |  |  | 155 |  |
Number of asset-backed securities with deterioration in future estimated cash flows | assetBackedSecurity |  | 4 |  | 4 | 4 | 4 |
Number of corporate notes with deterioration in future estimated cash flows | corporateNote |  | 12 |  |  | 12 |  |
Number of available-for-sale investment securities, unrealized loss position | security |  | 180 |  |  | 180 |  | 156
Debt securities, available for sale |  | $ 2,746,728,000 |  |  | $ 2,746,728,000 |  | $ 2,961,015,000
Debt securities, held-to-maturity, allowance for credit loss, excluding accrued interest |  | 0 |  |  | 0 |  | 0
Carrying value of consumer loans sold |  |  |  | $ 521,800,000 |  | $ 521,800,000 |
Net loss on sale of loans |  |  |  |  | 1,200,000 |  |
Investment securities held to maturity |  | 1,178,370,000 |  |  | 1,178,370,000 |  | 840,259,000
Servicing assets |  | 3,800,000 |  |  | 3,800,000 |  |
Variable Interest Entity, Not Primary Beneficiary |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Investment securities held to maturity |  | 436,800,000 |  |  | 436,800,000 |  |
Asset-backed securities |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Debt securities, available for sale |  | 104,716,000 |  |  | 104,716,000 |  | 160,542,000
Debt securities, held-to-maturity, allowance for credit loss, excluding accrued interest |  | 0 |  |  | 0 |  | 0
Investment securities held to maturity |  | 645,362,000 |  |  | 645,362,000 |  | 361,107,000
Consumer Loan, Held-For-Sale | Personal And Other Installment Loans |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Carrying value of consumer loans sold | $ 556,700,000 |  |  |  |  |  |
Consumer Loan, Held-For-Sale | Other Installment Loans |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Carrying value of consumer loans sold |  |  | $ 154,000,000 |  |  |  |
Asset Pledged as Collateral |  |  |  |  |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |  |  |  |  |
Debt securities, available for sale |  | 1,500,000,000 |  |  | 1,500,000,000 |  |
Debt securities |  | $ 402,600,000 |  |  | $ 402,600,000 |  | $ 16,700,000

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