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Fair Value Measurement - Assets and Liabilities Measured at Fair Value (Detail) - USD ($) $ in Thousands	Sep. 30, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	$ 602,046	$ 559,874
Equity securities	2,028	1,072
Assets Measured at Fair Value on a Recurring Basis [Member] | (Level 2) [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	602,046	559,874
Equity securities	2,028	1,072
Assets Measured at Fair Value on a Recurring Basis [Member] | (Level 2) [Member] | Swap [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Swap asset	18,448	11,072
Swap liability	18,448	11,072
Assets Measured at Fair Value on a Recurring Basis [Member] | (Level 2) [Member] | U.S. Treasury Securities and Obligations of U.S. Government Agencies [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	60,544	47,890
Assets Measured at Fair Value on a Recurring Basis [Member] | (Level 2) [Member] | Obligations of States and Political Subdivisions [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	297,807	298,836
Assets Measured at Fair Value on a Recurring Basis [Member] | (Level 2) [Member] | Mortgage-backed Securities in Government Sponsored Entities [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Total securities available for sale	243,695	213,148
Assets Measured at Fair Value on a Nonrecurring Basis [Member] | (Level 3) [Member] | Mortgage Servicing Rights [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets	$ 3,079	2,642
Assets Measured at Fair Value on a Nonrecurring Basis [Member] | (Level 3) [Member] | Impaired Loans [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Assets		$ 11

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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