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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 ($) | Mar. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2023
--- | --- | --- | ---
Financial assets: |  |  |
Cash and due from banks | $ 73,322,000 | $ 81,626,000 |
Cash at Federal Reserve and other banks | 9,514,000 | 17,075,000 |
Equity securities, fair value | 0 |  | $ 0
Financial liabilities: |  |  |
Other borrowings | 392,409,000 | 632,582,000 |
Junior subordinated debt | 101,120,000 | 101,099,000 |
Level 3 | Overdraft Privilege Commitments |  |  |
Off-balance sheet: |  |  |
Contract Amount | 129,273,000 | 121,539,000 |
Level 3 | Standby letters of credit |  |  |
Off-balance sheet: |  |  |
Contract Amount | 41,912,000 | 38,449,000 |
Level 3 | Commitments |  |  |
Off-balance sheet: |  |  |
Contract Amount | 2,206,882,000 | 2,225,677,000 |
Carrying Amount | Level 1 |  |  |
Financial assets: |  |  |
Cash and due from banks | 73,322,000 | 81,626,000 |
Cash at Federal Reserve and other banks | 9,514,000 | 17,075,000 |
Carrying Amount | Level 2 |  |  |
Financial assets: |  |  |
Securities held to maturity | 127,811,000 | 133,494,000 |
Equity securities, fair value | 17,250,000 | 17,250,000 |
Financial liabilities: |  |  |
Deposits | 7,987,658,000 | 7,834,038,000 |
Other borrowings | 392,409,000 | 632,582,000 |
Carrying Amount | Level 3 |  |  |
Financial assets: |  |  |
Loans, net | 6,676,301,000 | 6,672,948,000 |
Financial liabilities: |  |  |
Junior subordinated debt | 101,120,000 | 101,099,000 |
Fair Value | Level 1 |  |  |
Financial assets: |  |  |
Cash and due from banks | 73,322,000 | 81,626,000 |
Cash at Federal Reserve and other banks | 9,514,000 | 17,075,000 |
Fair Value | Level 2 |  |  |
Financial assets: |  |  |
Securities held to maturity | 118,528,000 | 125,126,000 |
Financial liabilities: |  |  |
Deposits | 7,982,067,000 | 7,828,554,000 |
Other borrowings | 329,409,000 | 632,582,000 |
Fair Value | Level 3 |  |  |
Financial assets: |  |  |
Loans, net | 6,291,078,000 | 6,278,577,000 |
Financial liabilities: |  |  |
Junior subordinated debt | 101,090,000 | 95,407,000 |
Fair Value | Level 3 | Overdraft Privilege Commitments |  |  |
Off-balance sheet: |  |  |
Fair Value | 1,293,000 | 1,215,000 |
Fair Value | Level 3 | Standby letters of credit |  |  |
Off-balance sheet: |  |  |
Fair Value | 419,000 | 385,000 |
Fair Value | Level 3 | Commitments |  |  |
Off-balance sheet: |  |  |
Fair Value | $ 22,069,000 | $ 22,257,000 |

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