Fair Values of Assets and Liabilities - Summary of Financial Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Sep. 30, 2024		Dec. 31, 2023
Securities available-for-sale:
Securities available-for-sale, at fair value	$ 133,004		$ 121,854
U.S. Government-sponsored enterprises ("GSE") obligations [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	1,432		1,398
U.S. Government agency small business administration pools guaranteed by the SBA [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	13,862	[1]	15,583
Collateralized mortgage obligations issued by the FHLMC, FNMA and GNMA [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	15,263	[1]	2,474
Residential mortgage backed GSE securities [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	39,774	[1]	38,221
Municipal bonds [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	54,577		54,692
Corporate debt [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	487		492
Corporate subordinated debt [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	7,609		8,994
Fair Value, Measurements, Recurring [Member] | U.S. Government-sponsored enterprises ("GSE") obligations [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	1,432		1,398
Fair Value, Measurements, Recurring [Member] | U.S. Government agency small business administration pools guaranteed by the SBA [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	13,862		15,583
Fair Value, Measurements, Recurring [Member] | Collateralized mortgage obligations issued by the FHLMC, FNMA and GNMA [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	15,263		2,474
Fair Value, Measurements, Recurring [Member] | Residential mortgage backed GSE securities [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	39,774		38,221
Fair Value, Measurements, Recurring [Member] | Municipal bonds [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	54,577		54,692
Fair Value, Measurements, Recurring [Member] | Corporate debt [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	487		492
Fair Value, Measurements, Recurring [Member] | Corporate subordinated debt [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	7,609		8,994
Fair Value, Measurements, Recurring [Member] | Derivative [Member]
Other assets:
Other assets, at fair value	143		90
Other liabilities:
Other liabilities, at fair value	152		848
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. Government-sponsored enterprises ("GSE") obligations [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	1,432		1,398
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | U.S. Government agency small business administration pools guaranteed by the SBA [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	13,862		15,583
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Collateralized mortgage obligations issued by the FHLMC, FNMA and GNMA [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	15,263		2,474
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Residential mortgage backed GSE securities [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	39,774		38,221
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Municipal bonds [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	54,577		54,692
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate debt [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	487		492
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Corporate subordinated debt [Member]
Securities available-for-sale:
Securities available-for-sale, at fair value	7,609		8,994
Fair Value, Measurements, Recurring [Member] | Fair Value, Inputs, Level 2 [Member] | Derivative [Member]
Other assets:
Other assets, at fair value	143		90
Other liabilities:
Other liabilities, at fair value	152		848
Fair Value, Measurements, Recurring [Member] | Mortgage servicing rights [Member]
Other assets:
Other assets, at fair value	308		339
Fair Value, Measurements, Recurring [Member] | Mortgage servicing rights [Member] | Fair Value, Inputs, Level 3 [Member]
Other assets:
Other assets, at fair value	$ 308		$ 339

[1] Actual maturities for these debt securities are dependent upon the interest rate environment and prepayments on the underlying loans.