Fair Value Measurements and Disclosure - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2024	Dec. 31, 2023
Fair Value Assets Measured On Recurring Basis [Line Items]
Securities available-for-sale, at fair value	$ 118,098	$ 91,352
Fair Value, Inputs, Level 2 [Member]
Fair Value Assets Measured On Recurring Basis [Line Items]
Securities available-for-sale, at fair value	118,098	91,352
Fair Value, Recurring [Member]
Fair Value Assets Measured On Recurring Basis [Line Items]
Securities available-for-sale, at fair value	118,098	91,352
Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Assets Measured On Recurring Basis [Line Items]
Securities available-for-sale, at fair value
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	118,098	91,352
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	0	0
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	64,841	42,634
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	64,841	42,634
Mortgage-backed securities - U.S. Government Sponsored Enterprises (GSEs) [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Assets Measured On Recurring Basis [Line Items]
Securities available-for-sale, at fair value
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	64,841	42,634
Mortgage-backed securities - U.S. Government Sponsored Enterprises (GSEs) [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	0	0
US Government Agencies Debt Securities [Member]
Fair Value Assets Measured On Recurring Basis [Line Items]
Securities available-for-sale, at fair value	10,182	5,291
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	10,182	5,291
US Government Agencies Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Assets Measured On Recurring Basis [Line Items]
Securities available-for-sale, at fair value
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	10,182	5,291
US Government Agencies Debt Securities [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	0	0
US States and Political Subdivisions Debt Securities [Member]
Fair Value Assets Measured On Recurring Basis [Line Items]
Securities available-for-sale, at fair value	40,680	40,809
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	40,680	40,809
US States and Political Subdivisions Debt Securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Assets Measured On Recurring Basis [Line Items]
Securities available-for-sale, at fair value
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	40,680	40,809
US States and Political Subdivisions Debt Securities [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	0	0
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	2,395	2,618
Small Business Association (SBA) securities [Member] | Fair Value, Recurring [Member] | Fair Value, Inputs, Level 1 [Member]
Fair Value Assets Measured On Recurring Basis [Line Items]
Securities available-for-sale, at fair value
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	2,395	2,618
Small Business Association (SBA) securities [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	$ 0	$ 0