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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, 2025 | Dec. 31, 2024 | Sep. 30, 2024
--- | --- | --- | ---
Financial assets: |  |  |
Cash and due from banks | $ 100,693,000 | $ 85,409,000 |
Cash at Federal Reserve and other banks | 198,127,000 | 59,547,000 |
Restricted equity securities | 0 |  | $ 0
Financial liabilities: |  |  |
Other borrowings | 17,039,000 | 89,610,000 |
Junior subordinated debt | 41,238,000 | 101,191,000 |
Carrying Amount | Level 1 |  |  |
Financial assets: |  |  |
Cash and due from banks | 100,693,000 | 85,409,000 |
Cash at Federal Reserve and other banks | 198,127,000 | 59,547,000 |
Carrying Amount | Level 2 |  |  |
Financial assets: |  |  |
Securities held to maturity | 95,446,000 | 111,866,000 |
Restricted equity securities | 17,250,000 | 17,250,000 |
Financial liabilities: |  |  |
Deposits | 8,334,461,000 | 8,087,576,000 |
Other borrowings | 17,039,000 | 89,610,000 |
Carrying Amount | Level 3 |  |  |
Financial assets: |  |  |
Loans, net | 6,882,253,000 | 6,643,157,000 |
Financial liabilities: |  |  |
Junior subordinated debt | 41,238,000 | 101,191,000 |
Fair Value | Level 1 |  |  |
Financial assets: |  |  |
Cash and due from banks | 100,693,000 | 85,409,000 |
Cash at Federal Reserve and other banks | 198,127,000 | 59,547,000 |
Fair Value | Level 2 |  |  |
Financial assets: |  |  |
Securities held to maturity | 91,299,000 | 104,349,000 |
Financial liabilities: |  |  |
Deposits | 8,331,961,000 | 8,085,150,000 |
Other borrowings | 17,039,000 | 89,780,000 |
Fair Value | Level 3 |  |  |
Financial assets: |  |  |
Loans, net | 6,651,009,000 | 6,293,727,000 |
Financial liabilities: |  |  |
Junior subordinated debt | $ 41,605,000 | $ 103,630,000 |

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