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Fair Value Measurements and Disclosure - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($)
$ in Thousands
Sep. 30, 2023
Dec. 31, 2022
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value $ 88,064 $ 83,402
Fair Value, Inputs, Level 2 [Member]    
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value 85,845 81,341
Fair Value, Inputs, Level 3 [Member]    
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value 2,219 2,061
Fair Value, Recurring [Member]    
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value 88,064 83,402
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value 85,845 81,341
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value 2,219 2,061
Mortgage-backed securities—U.S. government sponsored enterprises (GSEs) [Member]    
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value 40,043 34,915
Mortgage-backed securities—U.S. government sponsored enterprises (GSEs) [Member] | Fair Value, Recurring [Member]    
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value 40,043 34,915
Mortgage-backed securities—U.S. government sponsored enterprises (GSEs) [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value 40,043 34,915
US Government Agencies Debt Securities [Member]    
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value 4,904 5,085
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member]    
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value 4,904 5,085
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value 4,904 5,085
US States and Political Subdivisions Debt Securities [Member]    
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value 37,627 41,341
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member]    
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value 37,627 41,341
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value 37,627 41,341
Mortgage-Backed Securities, Issued by Private Enterprises [Member]    
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value 2,219 2,061
Mortgage-Backed Securities, Issued by Private Enterprises [Member] | Fair Value, Recurring [Member]    
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value 2,219 2,061
Mortgage-Backed Securities, Issued by Private Enterprises [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value 0 0
Mortgage-Backed Securities, Issued by Private Enterprises [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 3 [Member]    
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value 2,219 $ 2,061
Small Business Association (SBA) securities [Member] | Fair Value, Recurring [Member]    
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value 2,818  
Small Business Association (SBA) securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value 2,818  
Subordinated Debentures [Member]    
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value 453  
Subordinated Debentures [Member] | Fair Value, Recurring [Member]    
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value 453  
Subordinated Debentures [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 2 [Member]    
Fair Value Assets Measured On Recurring Basis [Line Items]    
Securities available-for-sale, at fair value $ 453