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Fair Value of Financial Instruments - Estimated Fair Values and Related Carrying or Notional Amounts (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Financial Assets: |  |
Securities - available-for-sale | $ 183,075 | $ 196,398
Reported Value Measurement [Member] |  |
Financial Assets: |  |
Cash and Cash Equivalents | 29,721 | 34,467
Interest-bearing time deposits | 4,019 | 4,018
Securities - available-for-sale | 183,075 | 196,398
Other Securities | 3,717 | 3,717
Loans held for sale | 1,679 | 1,221
Loans, net | 831,943 | 816,156
Interest receivable | 5,826 | 4,276
Financial Liabilities: |  |
Total Deposits | 928,859 | 919,340
Federal Funds Purchased and Securities Sold Under Agreement to Repurchase | 27,026 | 39,495
Federal Home Loan Bank advances | 5,000 | 5,000
Interest payable | 367 | 318
Fair Value [Member] |  |
Financial Assets: |  |
Cash and Cash Equivalents | 29,721 | 34,467
Interest-bearing time deposits | 4,019 | 4,009
Securities - available-for-sale | 183,075 | 196,398
Other Securities | 3,717 | 3,717
Loans held for sale | 1,679 | 1,221
Loans, net | 815,856 | 819,193
Interest receivable | 5,826 | 4,276
Financial Liabilities: |  |
Total Deposits | 928,986 | 920,109
Federal Funds Purchased and Securities Sold Under Agreement to Repurchase | 27,026 | 39,495
Federal Home Loan Bank advances | 5,001 | 5,021
Interest payable | 367 | 318
Interest Bearing Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 545,179 | 532,660
Interest Bearing Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 545,208 | 532,660
Non Interest Bearing Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 197,088 | 199,114
Non Interest Bearing Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 197,088 | 199,114
Time Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 186,592 | 187,566
Time Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 186,690 | 188,335
Level 1 [Member] |  |
Financial Assets: |  |
Cash and Cash Equivalents | 29,721 | 34,467
Securities - available-for-sale | 20,771 | 20,978
Level 2 [Member] |  |
Financial Assets: |  |
Interest-bearing time deposits | 4,019 | 4,009
Securities - available-for-sale | 160,911 | 173,992
Financial Liabilities: |  |
Total Deposits | 197,088 | 199,114
Level 2 [Member] | Non Interest Bearing Deposits [Member] |  |
Financial Liabilities: |  |
Total Deposits | 197,088 | 199,114
Level 3 [Member] |  |
Financial Assets: |  |
Securities - available-for-sale | 1,393 | 1,428
Other Securities | 3,717 | 3,717
Loans held for sale | 1,679 | 1,221
Loans, net | 815,856 | 819,193
Interest receivable | 5,826 | 4,276
Financial Liabilities: |  |
Total Deposits | 731,898 | 720,995
Federal Funds Purchased and Securities Sold Under Agreement to Repurchase | 27,026 | 39,495
Federal Home Loan Bank advances | 5,001 | 5,021
Interest payable | 367 | 318
Level 3 [Member] | Interest Bearing Deposits [Member] |  |
Financial Liabilities: |  |
Total Deposits | 545,208 | 532,660
Level 3 [Member] | Time Deposits [Member] |  |
Financial Liabilities: |  |
Total Deposits | $ 186,690 | $ 188,335

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