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Fair Value of Financial Instruments - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Mar. 31, 2022
Dec. 31, 2021
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Securities Available-for-Sale $ 413,996 $ 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 99,545 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 99,545 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 310,949 335,981
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 310,949 335,981
Level 3 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Securities Available-for-Sale 3,502 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 3,502 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 99,545 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 99,545 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 143,807 156,886
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 143,807 156,886
Mortgage-backed Securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Securities Available-for-Sale 105,060 117,927
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 105,060 117,927
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 65,584 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 62,082 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 3,502 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 $ 3,502 $ 4,773