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Fair Value of Financial Instruments - Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Dec. 31, 2021
Dec. 31, 2020
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Securities Available-for-Sale $ 429,931 $ 307,812
Level 1 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Securities Available-for-Sale 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 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 335,981 306,250
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 335,981 306,250
Level 3 [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Securities Available-for-Sale 4,773 1,562
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 4,773 1,562
U.S. Treasury [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Securities Available-for-Sale 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 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 156,886 124,241
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 156,886 124,241
Mortgage-backed Securities [Member]    
Fair Value Assets And Liabilities Measured On Recurring And Nonrecurring Basis Valuation Techniques [Line Items]    
Total Securities Available-for-Sale 117,927 113,056
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 117,927 113,056
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 65,941 70,515
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 61,168 68,953
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 4,773 1,562
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 $ 4,773 $ 1,562