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Investment Securities - Additional Information (Detail) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2024 USD ($) investmentSecurity securityLoan | Dec. 31, 2023 USD ($) security | Dec. 31, 2022 USD ($) security | Jun. 30, 2024 USD ($)
Investment Securities [Line Items] |  |  |  |
Credit loss | $ 0 | $ 0 | $ 0 |
Allowance for credit loss | 0 | 0 |  |
Proceeds from sale of available for sale securities | 31,534,000 | 71,024,000 | $ 0 |
Realized loss | 2,900,000 |  |  |
Gain on common stock | 693,462,000 | $ 697,349,000 |  |
Number of debt securities sold | security |  | 0 | 0 |
Securities pledged as collateral | 716,000,000.0 | $ 702,200,000 |  |
Residential real estate mortgage-backed securities | $ 1,300,000,000 |  |  |
Life of mortgage-backed securities | 6 years 5 months 4 days |  |  |
Visa Class C Common Stock |  |  |  |
Investment Securities [Line Items] |  |  |  |
Gain on common stock | $ 2,900,000 |  |  | $ 2,900,000
Obligations of U.S. government agencies |  |  |  |
Investment Securities [Line Items] |  |  |  |
Available for sale securities in unrealized loss position | investmentSecurity | 156 |  |  |
Percentage of aggregate depreciation in unrealized losses | 13.85% |  |  |
Obligations of states and political subdivisions |  |  |  |
Investment Securities [Line Items] |  |  |  |
Available for sale securities in unrealized loss position | investmentSecurity | 153 |  |  |
Percentage of aggregate depreciation in unrealized losses | 11.84% |  |  |
Corporate bonds |  |  |  |
Investment Securities [Line Items] |  |  |  |
Available for sale securities in unrealized loss position | securityLoan | 6 |  |  |
Percentage of aggregate depreciation in unrealized losses | 5.58% |  |  |
Debt securities, credit losses and impairments recognized in earnings | $ 0 |  |  |
Debt securities, available-for-sale, allowance for credit loss | $ 0 |  |  |
Asset backed securities |  |  |  |
Investment Securities [Line Items] |  |  |  |
Available for sale securities in unrealized loss position | investmentSecurity | 17 |  |  |
Percentage of aggregate depreciation in unrealized losses | 1.02% |  |  |
Non-agency collateralized mortgage obligations |  |  |  |
Investment Securities [Line Items] |  |  |  |
Available for sale securities in unrealized loss position | securityLoan | 18 |  |  |
Percentage of aggregate depreciation in unrealized losses | 11.13% |  |  |
Debt securities, credit losses and impairments recognized in earnings | $ 0 |  |  |
Allowance for credit loss | $ 0 |  |  |

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