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Fair Value of Financial Instruments - Estimated Fair Values and Related Carrying or Notional Amounts (Detail) - USD ($) $ in Thousands | Jun. 30, 2021 | Dec. 31, 2020
--- | --- | ---
Financial Assets: |  |
Securities - available-for-sale | $ 407,500 | $ 307,812
Reported Value Measurement [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 151,119 | 175,706
Interest-bearing time deposits | 18,597 | 4,653
Securities - available-for-sale | 407,500 | 307,812
Other securities | 6,419 | 5,939
Loans held for sale | 8,041 | 7,740
Loans, net | 1,443,336 | 1,289,318
Interest receivable | 6,495 | 6,188
Financial Liabilities: |  |
Total Deposits | 1,854,073 | 1,596,162
Federal funds purchased and securities sold under agreement to repurchase | 29,882 | 30,239
Federal Home Loan Bank advances | 17,868 | 17,861
Interest payable | 379 | 338
Fair Value [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 151,119 | 175,706
Interest-bearing time deposits | 18,635 | 4,677
Securities - available-for-sale | 407,500 | 307,812
Other securities | 6,419 | 5,939
Loans held for sale | 8,041 | 7,740
Loans, net | 1,402,959 | 1,261,440
Interest receivable | 6,495 | 6,188
Financial Liabilities: |  |
Total Deposits | 1,856,014 | 1,605,890
Federal funds purchased and securities sold under agreement to repurchase | 29,882 | 30,239
Federal Home Loan Bank advances | 17,869 | 17,872
Interest payable | 379 | 338
Interest Bearing Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 1,153,765 | 997,462
Interest Bearing Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 1,153,807 | 1,004,608
Non Interest Bearing Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 443,863 | 351,147
Non Interest Bearing Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 443,863 | 351,147
Time Deposits [Member] | Reported Value Measurement [Member] |  |
Financial Liabilities: |  |
Total Deposits | 256,445 | 247,553
Time Deposits [Member] | Fair Value [Member] |  |
Financial Liabilities: |  |
Total Deposits | 258,344 | 250,135
Level 1 [Member] |  |
Financial Assets: |  |
Cash and cash equivalents | 151,119 | 175,706
Securities - available-for-sale | 63,360 |
Level 2 [Member] |  |
Financial Assets: |  |
Interest-bearing time deposits | 18,635 | 4,677
Securities - available-for-sale | 340,192 | 306,250
Financial Liabilities: |  |
Total Deposits | 443,863 | 351,147
Level 2 [Member] | Non Interest Bearing Deposits [Member] |  |
Financial Liabilities: |  |
Total Deposits | 443,863 | 351,147
Level 3 [Member] |  |
Financial Assets: |  |
Securities - available-for-sale | 3,948 | 1,562
Other securities | 6,419 | 5,939
Loans held for sale | 8,041 | 7,740
Loans, net | 1,402,959 | 1,261,440
Interest receivable | 6,495 | 6,188
Financial Liabilities: |  |
Total Deposits | 1,412,151 | 1,254,743
Federal funds purchased and securities sold under agreement to repurchase | 29,882 | 30,239
Federal Home Loan Bank advances | 17,869 | 17,872
Interest payable | 379 | 338
Level 3 [Member] | Interest Bearing Deposits [Member] |  |
Financial Liabilities: |  |
Total Deposits | 1,153,807 | 1,004,608
Level 3 [Member] | Time Deposits [Member] |  |
Financial Liabilities: |  |
Total Deposits | $ 258,344 | $ 250,135

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