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Fair Value of Financial Instruments - Estimated Fair Values and Related Carrying or Notional Amounts (Detail) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Financial Assets: |  |
Securities - available-for-sale | $ 222,293 | $ 168,447
Reported Value Measurement [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 51,296 | 38,365
Interest-bearing time deposits | 4,309 | 4,019
Securities - available-for-sale | 222,293 | 168,447
Other securities | 5,810 | 3,679
Loans held for sale | 4,248 | 495
Loans, net | 1,211,771 | 839,599
Interest receivable | 6,769 | 4,542
Financial Liabilities: |  |
Total Deposits | 1,288,347 | 928,790
Fed funds purchased and securities sold under agreement to repurchase | 48,073 | 32,181
Federal Home Loan Bank advances | 24,806 |
Interest payable | 754 | 418
Fair Value [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 51,296 | 38,365
Interest-bearing time deposits | 4,331 | 3,954
Securities - available-for-sale | 222,293 | 168,447
Other securities | 5,810 | 3,679
Loans held for sale | 4,248 | 495
Loans, net | 1,188,014 | 823,914
Interest receivable | 6,769 | 4,542
Financial Liabilities: |  |
Total Deposits | 1,288,792 | 928,922
Fed funds purchased and securities sold under agreement to repurchase | 48,073 | 32,181
Federal Home Loan Bank advances | 24,811 |
Interest payable | 754 | 418
Level 1 [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 51,296 | 38,365
Securities - available-for-sale | 10,021 | 36,935
Level 2 [Member] |  |
Financial Assets: |  |
Interest-bearing time deposits | 4,331 | 3,954
Securities - available-for-sale | 210,782 | 130,085
Financial Liabilities: |  |
Total Deposits | 265,156 | 215,422
Level 3 [Member] |  |
Financial Assets: |  |
Securities - available-for-sale | 1,490 | 1,427
Other securities | 5,810 | 3,679
Loans held for sale | 4,248 | 495
Loans, net | 1,188,014 | 823,914
Interest receivable | 6,769 | 4,542
Financial Liabilities: |  |
Total Deposits | 1,023,636 | 713,500
Fed funds purchased and securities sold under agreement to repurchase | 48,073 | 32,181
Federal Home Loan Bank advances | 24,811 |
Interest payable | 754 | 418
Interest Bearing Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 746,628 | 525,955
Interest Bearing Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 746,628 | 525,955
Interest Bearing Deposits [Member] | Level 3 [Member] |  |
Financial Liabilities: |  |
Total Deposits | 746,628 | 525,955
Non Interest Bearing Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 265,156 | 215,422
Non Interest Bearing Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 265,156 | 215,422
Non Interest Bearing Deposits [Member] | Level 2 [Member] |  |
Financial Liabilities: |  |
Total Deposits | 265,156 | 215,422
Time Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 276,563 | 187,413
Time Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 277,008 | 187,545
Time Deposits [Member] | Level 3 [Member] |  |
Financial Liabilities: |  |
Total Deposits | $ 277,008 | $ 187,545

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