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Fair Value of Financial Instruments - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | $ 204,415 | $ 168,447
Level 1 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 24,795 | 36,935
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 | 24,795 | 36,935
Level 2 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 178,115 | 130,085
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 | 178,115 | 130,085
Level 3 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 1,505 | 1,427
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 | 1,505 | 1,427
U.S. Treasury [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 24,795 | 22,830
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 | 24,795 | 22,830
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 | 95,944 | 69,327
U.S. Government Agencies [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 |  | 14,105
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 | 95,944 | 55,222
Mortgage-backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 44,826 | 36,262
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 | 44,826 | 36,262
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 | 38,850 | 40,028
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 | 37,345 | 38,601
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 | 1,505 | 1,427
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 | $ 1,505 | $ 1,427

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