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v3.23.1

Investment Securities - Additional Information (Detail) | 3 Months Ended |
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Mar. 31, 2023 USD ($) security assetBackedSecurity corporateNote | Mar. 31, 2022 USD ($) assetBackedSecurity | Dec. 31, 2022 USD ($) security
Debt Securities, Available-for-sale [Line Items] |  |  |
Proceeds from sales of investment securities available for sale | $ 0 | $ 155,954,000 |
Number of available-for-sale investment securities, unrealized loss position, less than twelve month category | security | 50 |  |
Number of available-for-sale investment securities, unrealized loss position, twelve month or more category | security | 112 |  |
Number of asset-backed securities with deterioration in future estimated cash flows | assetBackedSecurity | 4 | 4 |
Number of corporate notes with deterioration in future estimated cash flows | corporateNote | 6 |  |
Number of available-for-sale investment securities, unrealized loss position | security | 162 |  | 156
Debt securities, available for sale | $ 2,900,259,000 |  | $ 2,961,015,000
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 | 147,935,000 |  | 160,542,000
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 | 1,600,000,000 |  |
Debt securities | $ 443,800,000 |  | $ 16,700,000

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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 No definition available. + Details
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- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for 12 months or longer, without an allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI https://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 + Details
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