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Fair Value Measurement - Carrying Amount and Fair Value of Financial Instruments Not Measured at Fair Value on a Recurring or Nonrecurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Financial Assets: |  |
Cash and due from financial institutions | $ 62,766 | $ 63,155
Equity securities in financial institutions | 2,600 | 2,400
Investments in time deposits | 735 | 1,450
Other securities | 27,901 | 30,352
Loans, net of allowance | 3,055,740 | 3,041,561
Accrued interest receivable | 14,070 | 13,453
Financial Liabilities: |  |
Short-term FHLB advances | 232,000 | 339,000
Long-term FHLB advances | 970 | 1,501
Other borrowings | 4,699 | 6,293
Carrying Amount [Member] |  |
Financial Assets: |  |
Cash and due from financial institutions | 62,766 | 63,155
Investments in time deposits | 735 | 1,450
Other securities | 27,901 | 30,352
Loans, net of allowance | 3,055,740 | 3,041,561
Accrued interest receivable | 14,070 | 13,453
Financial Liabilities: |  |
Nonmaturing deposits | 2,203,706 | 2,266,916
Time deposits | 1,026,757 | 944,954
Short-term FHLB advances | 232,000 | 339,000
Long-term FHLB advances | 970 | 1,501
Subordinated debentures | 104,213 | 104,089
Other borrowings | 4,699 | 6,293
Accrued interest payable | 8,257 | 9,518
Total Fair Value [Member] |  |
Financial Assets: |  |
Cash and due from financial institutions | 62,766 | 63,155
Investments in time deposits | 735 | 1,450
Other securities | 27,901 | 30,352
Loans, net of allowance | 2,951,845 | 2,919,899
Accrued interest receivable | 14,070 | 13,453
Financial Liabilities: |  |
Nonmaturing deposits | 2,203,706 | 2,266,916
Time deposits | 1,029,837 | 948,734
Short-term FHLB advances | 232,000 | 339,000
Long-term FHLB advances | 946 | 1,418
Subordinated debentures | 103,007 | 101,175
Other borrowings | 4,699 | 6,293
Accrued interest payable | 8,257 | 9,518
(Level 1) [Member] |  |
Financial Assets: |  |
Cash and due from financial institutions | 62,766 | 63,155
Other securities | 27,901 | 30,352
Accrued interest receivable | 14,070 | 13,453
Financial Liabilities: |  |
Nonmaturing deposits | 2,203,706 | 2,266,916
Short-term FHLB advances | 232,000 | 339,000
Accrued interest payable | 8,257 | 9,518
(Level 2) [Member] |  |
Financial Assets: |  |
Investments in time deposits | 735 | 1,450
(Level 3) [Member] |  |
Financial Assets: |  |
Loans, net of allowance | 2,951,845 | 2,919,899
Financial Liabilities: |  |
Time deposits | 1,029,837 | 948,734
Long-term FHLB advances | 946 | 1,418
Subordinated debentures | 103,007 | 101,175
Other borrowings | $ 4,699 | $ 6,293

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