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Fair Value of Financial Instruments - Estimated Fair Values and Related Carrying or Notional Amounts (Detail) - USD ($) $ in Thousands | Sep. 30, 2020 | Dec. 31, 2019
--- | --- | ---
Financial Assets: |  |
Securities - available-for-sale | $ 259,041 | $ 222,293
Reported Value Measurement [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 87,753 | 51,296
Interest-bearing time deposits | 4,657 | 4,309
Securities - available-for-sale | 259,041 | 222,293
Other securities | 5,827 | 5,810
Loans held for sale | 7,621 | 4,248
Loans, net | 1,351,979 | 1,211,771
Interest receivable | 6,879 | 6,769
Financial Liabilities: |  |
Total Deposits | 1,518,873 | 1,288,347
Federal funds purchased and securities sold under agreement to repurchase | 29,859 | 48,073
Federal Home Loan Bank advances | 17,724 | 24,806
Interest payable | 558 | 754
Fair Value [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 87,753 | 51,296
Interest-bearing time deposits | 4,718 | 4,331
Securities - available-for-sale | 259,041 | 222,293
Other securities | 5,827 | 5,810
Loans held for sale | 7,621 | 4,248
Loans, net | 1,324,451 | 1,188,014
Interest receivable | 6,879 | 6,769
Financial Liabilities: |  |
Total Deposits | 1,521,796 | 1,288,855
Federal funds purchased and securities sold under agreement to repurchase | 29,859 | 48,073
Federal Home Loan Bank advances | 17,737 | 24,811
Interest payable | 558 | 754
Interest Bearing Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 926,851 | 746,628
Interest Bearing Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 926,899 | 746,691
Non Interest Bearing Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 330,845 | 265,156
Non Interest Bearing Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 330,845 | 265,156
Time Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 261,177 | 276,563
Time Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 264,052 | 277,008
Level 1 [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 87,753 | 51,296
Securities - available-for-sale | 3,004 | 10,021
Level 2 [Member] |  |
Financial Assets: |  |
Interest-bearing time deposits | 4,718 | 4,331
Securities - available-for-sale | 254,452 | 210,782
Financial Liabilities: |  |
Total Deposits | 330,845 | 265,156
Level 2 [Member] | Non Interest Bearing Deposits [Member] |  |
Financial Liabilities: |  |
Total Deposits | 330,845 | 265,156
Level 3 [Member] |  |
Financial Assets: |  |
Securities - available-for-sale | 1,585 | 1,490
Other securities | 5,827 | 5,810
Loans held for sale | 7,621 | 4,248
Loans, net | 1,324,451 | 1,188,014
Interest receivable | 6,879 | 6,769
Financial Liabilities: |  |
Total Deposits | 1,190,951 | 1,023,699
Federal funds purchased and securities sold under agreement to repurchase | 29,859 | 48,073
Federal Home Loan Bank advances | 17,737 | 24,811
Interest payable | 558 | 754
Level 3 [Member] | Interest Bearing Deposits [Member] |  |
Financial Liabilities: |  |
Total Deposits | 926,899 | 746,691
Level 3 [Member] | Time Deposits [Member] |  |
Financial Liabilities: |  |
Total Deposits | $ 264,052 | $ 277,008

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