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Other Assets - Additional Information (Detail) - USD ($) $ in Thousands | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Schedule Of Other Assets [Line Items] |  |
Other assets | $ 347,928 | $ 323,573
Federal Home Loan Bank ("FHLB") and Federal Reserve Bank ("Federal Reserve") |  |
Schedule Of Other Assets [Line Items] |  |
Fair value of equity securities | 134,100 | 133,400
First National Bankers' Bank and Other Miscellaneous Holdings |  |
Schedule Of Other Assets [Line Items] |  |
Fair value of equity securities | $ 92,700 | $ 90,300

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