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Fair Value of Financial Instruments - Estimated Fair Values and Related Carrying or Notional Amounts (Detail) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Financial Assets: |  |
Securities - available-for-sale | $ 168,447 | $ 196,398
Reported Value Measurement [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 38,365 | 34,467
Interest-bearing time deposits | 4,019 | 4,018
Securities - available-for-sale | 168,447 | 196,398
Other securities | 3,679 | 3,679
Loans held for sale | 495 | 1,221
Loans, net | 839,599 | 816,156
Interest receivable | 4,542 | 4,276
Financial Liabilities: |  |
Total Deposits | 928,790 | 919,340
Fed funds purchased and securities sold under agreement to repurchase | 32,181 | 39,495
Federal Home Loan Bank advances |  | 5,000
Interest payable | 418 | 318
Fair Value [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 38,365 | 34,467
Interest-bearing time deposits | 3,954 | 4,009
Securities - available-for-sale | 168,447 | 196,398
Other securities | 3,679 | 3,679
Loans held for sale | 495 | 1,221
Loans, net | 823,914 | 819,193
Interest receivable | 4,542 | 4,276
Financial Liabilities: |  |
Total Deposits | 928,922 | 920,109
Fed funds purchased and securities sold under agreement to repurchase | 32,181 | 39,495
Federal Home Loan Bank advances |  | 5,021
Interest payable | 418 | 318
Interest Bearing Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 525,955 | 532,660
Interest Bearing Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 525,955 | 532,660
Non Interest Bearing Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 215,422 | 199,114
Non Interest Bearing Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 215,422 | 199,114
Time Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 187,413 | 187,566
Time Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 187,545 | 188,335
Level 1 [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 38,365 | 34,467
Securities - available-for-sale | 36,935 | 20,978
Level 2 [Member] |  |
Financial Assets: |  |
Interest-bearing time deposits | 3,954 | 4,009
Securities - available-for-sale | 130,085 | 173,992
Financial Liabilities: |  |
Total Deposits | 215,422 | 199,114
Level 2 [Member] | Non Interest Bearing Deposits [Member] |  |
Financial Liabilities: |  |
Total Deposits | 215,422 | 199,114
Level 3 [Member] |  |
Financial Assets: |  |
Securities - available-for-sale | 1,427 | 1,428
Other securities | 3,679 | 3,679
Loans held for sale | 495 | 1,221
Loans, net | 823,914 | 819,193
Interest receivable | 4,542 | 4,276
Financial Liabilities: |  |
Total Deposits | 713,500 | 720,995
Fed funds purchased and securities sold under agreement to repurchase | 32,181 | 39,495
Federal Home Loan Bank advances |  | 5,021
Interest payable | 418 | 318
Level 3 [Member] | Interest Bearing Deposits [Member] |  |
Financial Liabilities: |  |
Total Deposits | 525,955 | 532,660
Level 3 [Member] | Time Deposits [Member] |  |
Financial Liabilities: |  |
Total Deposits | $ 187,545 | $ 188,335

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