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Fair Value of Financial Instruments - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Jun. 30, 2020 | Dec. 31, 2019
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | $ 236,292 | $ 222,293
Level 1 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 8,030 | 10,021
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 | 8,030 | 10,021
Level 2 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 226,712 | 210,782
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 | 226,712 | 210,782
Level 3 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 1,550 | 1,490
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 | 1,550 | 1,490
U.S. Treasury [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 8,030 | 10,021
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 | 8,030 | 10,021
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 | 72,369 | 62,445
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 | 72,369 | 62,445
Mortgage-backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 103,699 | 95,197
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 | 103,699 | 95,197
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 | 52,194 | 54,630
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 | 50,644 | 53,140
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 | 1,550 | 1,490
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 | $ 1,550 | $ 1,490

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