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Fair Value of Financial Instruments - Estimated Fair Values and Related Carrying or Notional Amounts (Detail) - USD ($) $ in Thousands | Sep. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financial Assets: |  |
Securities - available-for-sale | $ 426,717 | $ 307,812
Financial Liabilities: |  |
Subordinated notes, net of unamortized issuance costs | 34,441 |
Reported Value Measurement [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 158,078 | 175,706
Interest-bearing time deposits | 14,622 | 4,653
Securities - available-for-sale | 426,717 | 307,812
Other securities | 4,905 | 5,939
Loans held for sale | 3,735 | 7,740
Loans, net | 1,479,864 | 1,289,318
Interest receivable | 7,401 | 6,188
Financial Liabilities: |  |
Total Deposits | 1,866,228 | 1,596,162
Federal funds purchased and securities sold under agreement to repurchase | 29,601 | 30,239
Federal Home Loan Bank advances | 17,868 | 17,861
Subordinated notes, net of unamortized issuance costs | 34,441 |
Interest payable | 588 | 338
Fair Value [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 158,078 | 175,706
Interest-bearing time deposits | 14,651 | 4,677
Securities - available-for-sale | 426,717 | 307,812
Other securities | 4,905 | 5,939
Loans held for sale | 3,735 | 7,740
Loans, net | 1,434,960 | 1,261,440
Interest receivable | 7,401 | 6,188
Financial Liabilities: |  |
Total Deposits | 1,862,291 | 1,605,890
Federal funds purchased and securities sold under agreement to repurchase | 29,601 | 30,239
Federal Home Loan Bank advances | 17,869 | 17,872
Subordinated notes, net of unamortized issuance costs | 35,000 |
Interest payable | 588 | 338
Interest Bearing Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 1,175,769 | 997,462
Interest Bearing Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 1,175,816 | 1,004,608
Non Interest Bearing Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 438,076 | 351,147
Non Interest Bearing Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 438,076 | 351,147
Time Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 252,383 | 247,553
Time Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 248,399 | 250,135
Level 1 [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 158,078 | 175,706
Securities - available-for-sale | 73,804 |
Level 2 [Member] |  |
Financial Assets: |  |
Interest-bearing time deposits | 14,651 | 4,677
Securities - available-for-sale | 349,146 | 306,250
Financial Liabilities: |  |
Total Deposits | 438,076 | 351,147
Subordinated notes, net of unamortized issuance costs | 35,000 |
Level 2 [Member] | Non Interest Bearing Deposits [Member] |  |
Financial Liabilities: |  |
Total Deposits | 438,076 | 351,147
Level 3 [Member] |  |
Financial Assets: |  |
Securities - available-for-sale | 3,767 | 1,562
Other securities | 4,905 | 5,939
Loans held for sale | 3,735 | 7,740
Loans, net | 1,434,960 | 1,261,440
Interest receivable | 7,401 | 6,188
Financial Liabilities: |  |
Total Deposits | 1,424,215 | 1,254,743
Federal funds purchased and securities sold under agreement to repurchase | 29,601 | 30,239
Federal Home Loan Bank advances | 17,869 | 17,872
Interest payable | 588 | 338
Level 3 [Member] | Interest Bearing Deposits [Member] |  |
Financial Liabilities: |  |
Total Deposits | 1,175,816 | 1,004,608
Level 3 [Member] | Time Deposits [Member] |  |
Financial Liabilities: |  |
Total Deposits | $ 248,399 | $ 250,135

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