Fair Value Disclosures - Summary of Loans Held-for-Sale at Fair Value (Detail) - USD ($) $ in Thousands	Sep. 30, 2023	Dec. 31, 2022	Sep. 30, 2022	Jun. 30, 2022
Fair Value Measurements Loans Held For Sale [Abstract]
Unpaid principal balance on loans held-for-sale	$ 11,684	$ 10,226	$ 15,998
Net unrealized gains on loans held-for-sale	224	271	(106)
Loans held-for-sale at fair value	$ 11,908	$ 10,497	$ 15,892	$ 15,892