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Investment Securities - Additional Information (Detail) | 3 Months Ended |
--- | --- | ---
Mar. 31, 2024 USD ($) assetBackedSecurity security corporateNote | Mar. 31, 2023 USD ($) assetBackedSecurity corporateNote | Dec. 31, 2023 USD ($) security
Debt Securities, Available-for-sale [Line Items] |  |  |
Proceeds from sales of investment securities available for sale | $ 21,970,000 | $ 0 |
Number of available-for-sale investment securities, unrealized loss position, less than twelve month category | security | 38 |  |
Number of available-for-sale investment securities, unrealized loss position, twelve month or more category | security | 102 |  |
Number of asset-backed securities with deterioration in future estimated cash flows | assetBackedSecurity | 1 | 4 |
Number of corporate notes with deterioration in future estimated cash flows | corporateNote | 19 | 6 |
Number of available-for-sale investment securities, unrealized loss position | security | 140 |  | 119
Debt securities, available for sale | $ 2,571,139,000 |  | $ 2,376,860,000
Debt securities, held-to-maturity, allowance for credit loss, excluding accrued interest | 0 |  | 0
Asset-backed securities |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt securities, available for sale | 58,234,000 |  | 92,629,000
Debt securities, held-to-maturity, allowance for credit loss, excluding accrued interest | 0 |  | 0
Asset Pledged as Collateral |  |  |
Debt Securities, Available-for-sale [Line Items] |  |  |
Debt securities, available for sale | 1,300,000,000 |  | 1,200,000,000
Debt securities | $ 391,400,000 |  | $ 398,400,000

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- Definition Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading). + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(1)(a)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 320 -SubTopic 10 -Name Accounting Standards Codification -Section 45 -Paragraph 1 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org//1943274/2147481830/320-10-45-1 + Details
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