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Fair Value Measurement - Estimated Fair Values of Financial Instruments that are Reported at Amortized Cost in Consolidated Balance Sheets (Detail) - USD ($) | Sep. 30, 2024 | Dec. 31, 2023 | Sep. 30, 2023
--- | --- | --- | ---
Financial assets: |  |  |
Cash and due from banks | $ 110,141,000 | $ 81,626,000 |
Cash at Federal Reserve and other banks | 209,973,000 | 17,075,000 |
Equity securities, fair value | 0 |  | $ 0
Financial liabilities: |  |  |
Other borrowings | 266,767,000 | 632,582,000 |
Junior subordinated debt | 101,164,000 | 101,099,000 |
Carrying Amount | Level 1 |  |  |
Financial assets: |  |  |
Cash and due from banks | 110,141,000 | 81,626,000 |
Cash at Federal Reserve and other banks | 209,973,000 | 17,075,000 |
Carrying Amount | Level 2 |  |  |
Financial assets: |  |  |
Securities held to maturity | 117,259,000 | 133,494,000 |
Equity securities, fair value | 17,250,000 | 17,250,000 |
Financial liabilities: |  |  |
Deposits | 8,037,091,000 | 7,834,038,000 |
Other borrowings | 266,767,000 | 632,582,000 |
Carrying Amount | Level 3 |  |  |
Financial assets: |  |  |
Loans, net | 6,560,131,000 | 6,672,948,000 |
Financial liabilities: |  |  |
Junior subordinated debt | 101,164,000 | 101,099,000 |
Fair Value | Level 1 |  |  |
Financial assets: |  |  |
Cash and due from banks | 110,141,000 | 81,626,000 |
Cash at Federal Reserve and other banks | 209,973,000 | 17,075,000 |
Fair Value | Level 2 |  |  |
Financial assets: |  |  |
Securities held to maturity | 113,708,000 | 125,126,000 |
Financial liabilities: |  |  |
Deposits | 8,035,484,000 | 7,828,554,000 |
Other borrowings | 266,767,000 | 632,582,000 |
Fair Value | Level 3 |  |  |
Financial assets: |  |  |
Loans, net | 6,259,677,000 | 6,278,577,000 |
Financial liabilities: |  |  |
Junior subordinated debt | $ 105,949,000 | $ 95,407,000 |

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