Fair Value of Assets and Liabilities - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands	Jun. 30, 2025		Dec. 31, 2024
Assets
Equity securities, fair value	$ 1,800		$ 1,700
Level 1 [Member]
Assets
Equity securities, fair value	0		1,732
Level 2 [Member]
Assets
Equity securities, fair value	0		0
Fair Value Recurring [Member]
Assets
Investment securities	61,529	[1]	54,805	[2]
Equity securities, fair value	1,763		1,732
Total	63,292		56,537
Fair Value Recurring [Member] | Level 1 [Member]
Assets
Equity securities, fair value	1,763		1,732
Total	1,763		1,732
Fair Value Recurring [Member] | Level 2 [Member]
Assets
Investment securities	61,529	[1]	54,805	[2]
Total	$ 61,529		$ 54,805

[1] Total unrealized losses of $0.1 million and unrealized gains of $0.5 million, net of tax, related to these assets was included in other comprehensive income for the three and six months ended June 30, 2025.

[2] Total unrealized losses of less than $0.1 million, net of tax, related to these assets was included in other comprehensive income for the year ended December 31, 2024.