Loans - Schedule of Average Recorded Investment in Impaired Loans and Related Interest Income Recognized (Detail) $ in Thousands	3 Months Ended
	Mar. 31, 2023 USD ($)
Average recorded investment:
Average recorded investment in impaired loans	$ 1,799
Interest income recognized:
Interest income recognized on a cash basis on impaired loans	13
Commercial [Member]
Average recorded investment:
Average recorded investment in impaired loans	264
Interest income recognized:
Interest income recognized on a cash basis on impaired loans	1
Commercial Real Estate [Member]
Average recorded investment:
Average recorded investment in impaired loans	222
Interest income recognized:
Interest income recognized on a cash basis on impaired loans	2
Residential Real Estate [Member]
Average recorded investment:
Average recorded investment in impaired loans	849
Interest income recognized:
Interest income recognized on a cash basis on impaired loans	8
Construction & Land Development [Member]
Average recorded investment:
Average recorded investment in impaired loans	329
Consumer [Member]
Average recorded investment:
Average recorded investment in impaired loans	135
Interest income recognized:
Interest income recognized on a cash basis on impaired loans	$ 2