Loans - Schedule of Average Recorded Investment in Impaired Loans and Related Interest Income Recognized (Detail) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
	Sep. 30, 2022	Sep. 30, 2022
Average recorded investment:
Average recorded investment in impaired loans	$ 1,274	$ 1,533
Interest income recognized:
Interest income recognized on a cash basis on impaired loans	11	37
Commercial and Industrial [Member]
Average recorded investment:
Average recorded investment in impaired loans	255	258
Interest income recognized:
Interest income recognized on a cash basis on impaired loans		2
Commercial Real Estate [Member]
Average recorded investment:
Average recorded investment in impaired loans	173	198
Interest income recognized:
Interest income recognized on a cash basis on impaired loans	2	6
Residential Real Estate [Member]
Average recorded investment:
Average recorded investment in impaired loans	715	781
Interest income recognized:
Interest income recognized on a cash basis on impaired loans	7	23
Construction & Land Development [Member]
Average recorded investment:
Average recorded investment in impaired loans		164
Consumer [Member]
Average recorded investment:
Average recorded investment in impaired loans	131	132
Interest income recognized:
Interest income recognized on a cash basis on impaired loans	$ 2	$ 6