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Fair Value Measurement - Assets and Liabilities Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available for sale $ 530,817 $ 559,874
Equity securities 1,161 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 530,817 559,874
Equity securities 1,161 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 10,877 11,072
Swap liability 10,877 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 42,324 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 300,699 298,836
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 187,794 213,148
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 $ 2,664 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