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Fair Value of Financial Instruments - Estimated Fair Values and Related Carrying or Notional Amounts (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Financial Assets: |  |
Securities - available-for-sale | $ 352,974 | $ 307,812
Reported Value Measurement [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 175,500 | 175,706
Interest-bearing time deposits | 4,405 | 4,653
Securities - available-for-sale | 352,974 | 307,812
Other securities | 5,939 | 5,939
Loans held for sale | 7,511 | 7,740
Loans, net | 1,327,254 | 1,289,318
Interest receivable | 6,568 | 6,188
Financial Liabilities: |  |
Total Deposits | 1,683,851 | 1,596,162
Federal funds purchased and securities sold under agreement to repurchase | 30,072 | 30,239
Federal Home Loan Bank advances | 17,840 | 17,861
Interest payable | 357 | 338
Fair Value [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 175,500 | 175,706
Interest-bearing time deposits | 4,451 | 4,677
Securities - available-for-sale | 352,974 | 307,812
Other securities | 5,939 | 5,939
Loans held for sale | 7,511 | 7,740
Loans, net | 1,295,821 | 1,261,440
Interest receivable | 6,568 | 6,188
Financial Liabilities: |  |
Total Deposits | 1,685,393 | 1,605,890
Federal funds purchased and securities sold under agreement to repurchase | 30,072 | 30,239
Federal Home Loan Bank advances | 17,845 | 17,872
Interest payable | 357 | 338
Interest Bearing Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 1,056,576 | 997,462
Interest Bearing Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 1,056,600 | 1,004,608
Non Interest Bearing Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 384,558 | 351,147
Non Interest Bearing Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 384,558 | 351,147
Time Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 242,717 | 247,553
Time Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 244,235 | 250,135
Level 1 [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 175,500 | 175,706
Securities - available-for-sale | 43,325 |
Level 2 [Member] |  |
Financial Assets: |  |
Interest-bearing time deposits | 4,451 | 4,677
Securities - available-for-sale | 308,110 | 306,250
Financial Liabilities: |  |
Total Deposits | 384,558 | 351,147
Level 2 [Member] | Non Interest Bearing Deposits [Member] |  |
Financial Liabilities: |  |
Total Deposits | 384,558 | 351,147
Level 3 [Member] |  |
Financial Assets: |  |
Securities - available-for-sale | 1,539 | 1,562
Other securities | 5,939 | 5,939
Loans held for sale | 7,511 | 7,740
Loans, net | 1,295,821 | 1,261,440
Interest receivable | 6,568 | 6,188
Financial Liabilities: |  |
Total Deposits | 1,300,835 | 1,254,743
Federal funds purchased and securities sold under agreement to repurchase | 30,072 | 30,239
Federal Home Loan Bank advances | 17,845 | 17,872
Interest payable | 357 | 338
Level 3 [Member] | Interest Bearing Deposits [Member] |  |
Financial Liabilities: |  |
Total Deposits | 1,056,600 | 1,004,608
Level 3 [Member] | Time Deposits [Member] |  |
Financial Liabilities: |  |
Total Deposits | $ 244,235 | $ 250,135

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