Fair Value Measurements - Summary of Fair Value of Assets and Liabilities Measured on Recurring Basis (Detail) - Fair Value, Recurring [Member] - USD ($) $ in Thousands	Sep. 30, 2024	Dec. 31, 2023
Assets:
US Government Agency securities	$ 12,377	$ 12,985
US Government Treasury securities		4,942
Obligations of state and political subdivisions	48,595	47,045
Mortgage backed securities in government-sponsored entities	87,828	48,181
Other securities	515	2,337
Total	149,315	115,490
Derivative		716
Liabilities:
Derivative	120
Fair Value, Inputs, Level 1 [Member]
Assets:
US Government Agency securities	0	0
US Government Treasury securities		0
Obligations of state and political subdivisions	0	0
Mortgage backed securities in government-sponsored entities	0	0
Other securities	0	0
Total	0	0
Derivative		0
Liabilities:
Derivative	0
Fair Value, Inputs, Level 2 [Member]
Assets:
US Government Agency securities	12,377	12,985
US Government Treasury securities		4,942
Obligations of state and political subdivisions	48,595	47,045
Mortgage backed securities in government-sponsored entities	87,828	48,181
Other securities	515	2,337
Total	149,315	115,490
Derivative		0
Liabilities:
Derivative	0
Fair Value, Inputs, Level 3 [Member]
Assets:
US Government Agency securities	0	0
US Government Treasury securities		0
Obligations of state and political subdivisions	0	0
Mortgage backed securities in government-sponsored entities	0	0
Other securities	0	0
Total	0	0
Derivative		$ 716
Liabilities:
Derivative	$ 120