Fair Value of Assets and Liabilities - Summary of Assets and Liabilities Measured at Fair Value on a Recurring Basis (Detail) - USD ($) $ in Thousands		Sep. 30, 2023		Dec. 31, 2022
Assets
Interest-bearing deposits		$ 1,300
Equity securities, fair value		1,700		$ 1,700
Fair Value Recurring [Member]
Assets
Interest-bearing deposits		1,250		1,250
Available for sale investment securities		53,175		48,492
Equity securities, fair value	[1]	1,671		1,724
Total		56,096	[2]	51,466	[3]
Fair Value Recurring [Member] | Level 1 [Member]
Assets
Equity securities, fair value		1,671		1,724
Total		1,671	[2]	1,724	[3]
Fair Value Recurring [Member] | Level 2 [Member]
Assets
Interest-bearing deposits		1,250		1,250
Available for sale investment securities		53,175		48,492
Total		$ 54,425	[2]	$ 49,742	[3]

[1] Included within other assets on the balance sheet.

[2] Total unrealized losses of $1.2 million and $1.6 million, net of tax, was included in other comprehensive income for the three and nine months ended September 30, 2023 related to these assets.

[3] Total unrealized losses of $4.4 million, net of tax, was included in other comprehensive loss for the year ended December 31, 2022 related to these assets.