Goodwill and Other Intangible Assets - Summary of Goodwill and Other Intangible Assets (Details) - USD ($) $ in Thousands	Sep. 30, 2021	Dec. 31, 2020	Sep. 30, 2020
Goodwill And Intangible Assets Disclosure [Abstract]
Goodwill	$ 7,435	$ 7,400
Gross carrying amount	2,048
Accumulated amortization	(1,341)
Core deposit intangible, net	707
Total	$ 8,142	$ 8,410	$ 8,502