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Fair Value Measurement - Assets and Liabilities Measured at Fair Value (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Total securities available for sale $ 617,298 $ 615,402
Equity securities 1,952 2,190
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 617,298 615,402
Equity securities 1,952 2,190
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 16,432 16,579
Swap liability 16,432 16,579
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 61,144 61,029
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 330,155 317,248
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 225,999 237,125
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 $ 3,056 $ 2,689