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Investment Securities - Additional Information (Detail) | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2024 USD ($) investmentSecurity securityLoan | Sep. 30, 2023 USD ($) | Sep. 30, 2024 USD ($) investmentSecurity securityLoan | Sep. 30, 2023 USD ($) | Dec. 31, 2023 USD ($)
Investment Securities [Line Items] |  |  |  |  |
Proceeds from the sale of investment securities | $ 0 | $ 0 | $ 28,600,000 | $ 24,200,000 |
Gross realized losses from the sale of investment securities |  |  | 2,900,000 | $ 200,000 |
Gain on common stock | 693,176,000 |  | 693,176,000 |  | $ 697,349,000
Securities pledged as collateral | 761,600,000 |  | 761,600,000 |  | $ 702,200,000
Residential real estate mortgage-backed securities | 1,300,000,000 |  | $ 1,300,000,000 |  |
Life of mortgage-backed securities |  |  | 6 years 8 months 1 day |  |
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] |  |  |  |  |
Impairment losses recognized | 0 |  | 0 |  |
Allowance for credit losses | $ 0 |  | $ 0 |  |
Number of available for sale securities in unrealized loss position (in investment securities) | investmentSecurity | 144 |  | 144 |  |
Percentage of aggregate depreciation in unrealized losses | 10.79% |  | 10.79% |  |
Obligations of states and political subdivisions |  |  |  |  |
Investment Securities [Line Items] |  |  |  |  |
Impairment losses recognized | $ 0 |  | $ 0 |  |
Allowance for credit losses | $ 0 |  | $ 0 |  |
Number of available for sale securities in unrealized loss position (in investment securities) | investmentSecurity | 148 |  | 148 |  |
Percentage of aggregate depreciation in unrealized losses | 8.66% |  | 8.66% |  |
Corporate bonds |  |  |  |  |
Investment Securities [Line Items] |  |  |  |  |
Impairment losses recognized | $ 0 |  | $ 0 |  |
Allowance for credit losses | $ 0 |  | $ 0 |  |
Number of available for sale securities in unrealized loss position (in investment securities) | investmentSecurity | 5 |  | 5 |  |
Percentage of aggregate depreciation in unrealized losses | 6.81% |  | 6.81% |  |
Asset backed securities |  |  |  |  |
Investment Securities [Line Items] |  |  |  |  |
Impairment losses recognized | $ 0 |  | $ 0 |  |
Allowance for credit losses | $ 0 |  | $ 0 |  |
Number of available for sale securities in unrealized loss position (in investment securities) | investmentSecurity | 24 |  | 24 |  |
Percentage of aggregate depreciation in unrealized losses | 0.69% |  | 0.69% |  |
Non-agency collateralized mortgage obligations |  |  |  |  |
Investment Securities [Line Items] |  |  |  |  |
Number of available for sale securities in unrealized loss position (in investment securities) | securityLoan | 18 |  | 18 |  |
Percentage of aggregate depreciation in unrealized losses | 9.94% |  | 9.94% |  |

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