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Fair Value of Financial Instruments - Estimated Fair Values and Related Carrying or Notional Amounts (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Financial Assets: |  |
Securities - available-for-sale | $ 204,415 | $ 168,447
Reported Value Measurement [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 123,278 | 38,365
Interest-bearing time deposits | 4,509 | 4,019
Securities - available-for-sale | 204,415 | 168,447
Other securities | 5,789 | 3,679
Loans held for sale | 1,909 | 495
Loans, net | 1,084,448 | 839,599
Interest receivable | 6,862 | 4,542
Financial Liabilities: |  |
Total Deposits | 1,242,347 | 928,790
Federal funds purchased and securities sold under agreement to repurchase | 27,102 | 32,181
Federal Home Loan Bank advances | 24,532 |
Interest payable | 750 | 418
Fair Value [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 123,278 | 38,365
Interest-bearing time deposits | 4,509 | 3,954
Securities - available-for-sale | 204,415 | 168,447
Other securities | 5,789 | 3,679
Loans held for sale | 1,909 | 495
Loans, net | 1,064,236 | 823,914
Interest receivable | 6,832 | 4,542
Financial Liabilities: |  |
Total Deposits | 1,243,109 | 928,922
Federal funds purchased and securities sold under agreement to repurchase | 27,102 | 3,181
Federal Home Loan Bank advances | 24,393 |
Interest payable | 750 | 418
Interest Bearing Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 723,684 | 525,955
Interest Bearing Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 723,738 | 525,955
Non Interest Bearing Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 242,510 | 215,422
Non Interest Bearing Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 242,510 | 215,422
Time Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 276,153 | 187,413
Time Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 276,861 | 187,545
Level 1 [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 123,278 | 38,365
Securities - available-for-sale | 24,795 | 36,935
Level 2 [Member] |  |
Financial Assets: |  |
Interest-bearing time deposits | 4,509 | 3,954
Securities - available-for-sale | 178,115 | 130,085
Financial Liabilities: |  |
Total Deposits | 242,510 | 215,422
Level 2 [Member] | Non Interest Bearing Deposits [Member] |  |
Financial Liabilities: |  |
Total Deposits | 242,510 | 215,422
Level 3 [Member] |  |
Financial Assets: |  |
Securities - available-for-sale | 1,505 | 1,427
Other securities | 5,789 | 3,679
Loans held for sale | 1,909 | 495
Loans, net | 1,064,236 | 823,914
Interest receivable | 6,862 | 4,542
Financial Liabilities: |  |
Total Deposits | 1,000,599 | 713,500
Federal funds purchased and securities sold under agreement to repurchase | 27,102 | 32,181
Federal Home Loan Bank advances | 24,393 |
Interest payable | 750 | 418
Level 3 [Member] | Interest Bearing Deposits [Member] |  |
Financial Liabilities: |  |
Total Deposits | 723,738 | 525,955
Level 3 [Member] | Time Deposits [Member] |  |
Financial Liabilities: |  |
Total Deposits | $ 276,861 | $ 187,545

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