Fair Value Measurements and Disclosures - Summary of Financial Assets Measured at Fair Value on Recurring Basis (Detail) - USD ($) $ in Thousands	Mar. 31, 2026	Dec. 31, 2025
Fair Value Assets Measured On Recurring Basis [Line Items]
Securities available-for-sale, at fair value	$ 164,557	$ 182,569
Fair Value, Inputs, Level 1 [Member]
Fair Value Assets Measured On Recurring Basis [Line Items]
Securities available-for-sale, at fair value	1,964	2,953
Fair Value, Inputs, Level 2 [Member]
Fair Value Assets Measured On Recurring Basis [Line Items]
Securities available-for-sale, at fair value	162,593	179,616
Mortgage-backed securities - U.S. government sponsored enterprise (GSEs) [Member]
Fair Value Assets Measured On Recurring Basis [Line Items]
Securities available-for-sale, at fair value	112,115	127,647
Mortgage-backed securities - U.S. government sponsored enterprise (GSEs) [Member] \| Fair Value, Recurring [Member]
Fair Value Assets Measured On Recurring Basis [Line Items]
Securities available-for-sale, at fair value	112,115	127,647
Mortgage-backed securities - U.S. government sponsored enterprise (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	112,115	127,647
Mortgage-backed securities - U.S. government sponsored enterprise (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	10,435	10,512
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	10,435	10,512
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		0
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	10,435	10,512
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	38,974	40,198
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	38,974	40,198
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	38,974	40,198
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	1,069	1,259
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	1,069	1,259
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
U.S. treasury securities [Member]
Fair Value Assets Measured On Recurring Basis [Line Items]
Securities available-for-sale, at fair value	1,964	2,953
U.S. treasury securities [Member] \| Fair Value, Recurring [Member]
Fair Value Assets Measured On Recurring Basis [Line Items]
Securities available-for-sale, at fair value	1,964	2,953
U.S. treasury 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	1,964	2,953
U.S. treasury 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	0	0
U.S. treasury 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
Mortgage Servicing Rights [Member] \| Fair Value, Recurring [Member]
Fair Value Assets Measured On Recurring Basis [Line Items]
Securities available-for-sale, at fair value	587	622
Mortgage Servicing Rights [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	0	0
Mortgage Servicing Rights [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	587	622
Mortgage Servicing Rights [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