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Fair Value of Financial Instruments - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands | Sep. 30, 2022 | Dec. 31, 2021
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Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | $ 395,485 | $ 429,931
Level 1 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 95,162 | 89,177
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 | 95,162 | 89,177
Level 2 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 296,957 | 335,981
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 | 296,957 | 335,981
Level 3 [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 3,366 | 4,773
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 | 3,366 | 4,773
U.S. Treasury [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 95,162 | 89,177
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 | 95,162 | 89,177
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 | 138,020 | 156,886
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 | 138,020 | 156,886
Mortgage-backed Securities [Member] |  |
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items] |  |
Total Securities Available-for-Sale | 90,264 | 117,927
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 | 90,264 | 117,927
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 | 72,039 | 65,941
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 | 68,673 | 61,168
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 | 3,366 | 4,773
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 | $ 3,366 | $ 4,773

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