Fair Value Measurements - Summary of Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Mar. 31, 2023	Dec. 31, 2022
Assets:
US government agency securities	$ 2,004
Small Business Administration loan pools	768	$ 843
Obligations of state and political subdivisions	42,455	40,169
Mortgage backed securities in government-sponsored entities	41,577	37,801
Total	86,804	78,813
Fair Value, Inputs, Level 1 [Member]
Assets:
US government agency securities	0
Small Business Administration loan pools	0	0
Obligations of state and political subdivisions	0	0
Mortgage backed securities in government-sponsored entities	0	0
Total	0	0
Fair Value, Inputs, Level 2 [Member]
Assets:
US government agency securities	2,004
Small Business Administration loan pools	768	843
Obligations of state and political subdivisions	42,455	40,169
Mortgage backed securities in government-sponsored entities	41,577	37,801
Total	86,804	78,813
Fair Value, Inputs, Level 3 [Member]
Assets:
US government agency securities	0
Small Business Administration loan pools	0	0
Obligations of state and political subdivisions	0	0
Mortgage backed securities in government-sponsored entities	0	0
Total	$ 0	$ 0