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Fair Value of Financial Instruments - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2018 | Dec. 31, 2017
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | $ 183,075 | $ 196,398
Level 1 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 20,771 | 20,978
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 | 20,771 | 20,978
Level 2 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 160,911 | 173,992
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 | 160,911 | 173,992
Level 3 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 1,393 | 1,428
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 | 1,393 | 1,428
U.S. Treasury [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 20,771 | 20,978
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 | 20,771 | 20,978
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 | 75,767 | 80,466
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 | 75,767 | 80,466
Mortgage-backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 34,600 | 39,510
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 | 34,600 | 39,510
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 | 51,937 | 55,444
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 | 50,544 | 54,016
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 | 1,393 | 1,428
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 | $ 1,393 | $ 1,428

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