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Fair Value of Financial Instruments - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | $ 352,974 | $ 307,812
Level 1 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 43,325 |
Level 1 [Member] | Fair Value on a Recurring Basis [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 43,325 |
Level 2 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 308,110 | 306,250
Level 2 [Member] | Fair Value on a Recurring Basis [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 308,110 | 306,250
Level 3 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 1,539 | 1,562
Level 3 [Member] | Fair Value on a Recurring Basis [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 1,539 | 1,562
U.S. Treasury [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 43,325 |
U.S. Treasury [Member] | Level 1 [Member] | Fair Value on a Recurring Basis [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 43,325 |
U.S. Government Agencies [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 130,799 | 124,241
U.S. Government Agencies [Member] | Level 2 [Member] | Fair Value on a Recurring Basis [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 130,799 | 124,241
Mortgage-backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 116,363 | 113,056
Mortgage-backed Securities [Member] | Level 2 [Member] | Fair Value on a Recurring Basis [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 116,363 | 113,056
State and Local Governments [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 62,487 | 70,515
State and Local Governments [Member] | Level 2 [Member] | Fair Value on a Recurring Basis [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 60,948 | 68,953
State and Local Governments [Member] | Level 3 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 1,539 | 1,562
State and Local Governments [Member] | Level 3 [Member] | Fair Value on a Recurring Basis [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | $ 1,539 | $ 1,562

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