Loans - Internal Risk Rating Of Loans By Portfolio Segment (Detail) - USD ($) $ in Thousands	Mar. 31, 2022	Dec. 31, 2021
Total loans	$ 378,009	$ 374,991
Pass [Member]
Total loans	374,411	371,321
Special Mention [Member]
Total loans	2,677	2,701
Substandard [Member]
Total loans	921	969
CRE [Member]
Total loans	76,397	72,057
CRE [Member] | Pass [Member]
Total loans	73,619	69,252
CRE [Member] | Special Mention [Member]
Total loans	2,677	2,701
CRE [Member] | Substandard [Member]
Total loans	101	104
MF [Member]
Total loans	8,900	8,998
MF [Member] | Pass [Member]
Total loans	8,900	8,998
C+I [Member]
Total loans	28,459	26,851
C+I [Member] | Pass [Member]
Total loans	28,434	26,823
C+I [Member] | Substandard [Member]
Total loans	25	28
ADL [Member]
Total loans	17,423	21,365
ADL [Member] | Pass [Member]
Total loans	17,423	21,365
RES [Member]
Total loans	235,273	234,199
RES [Member] | Pass [Member]
Total loans	234,593	233,477
RES [Member] | Substandard [Member]
Total loans	680	722
HELOC [Member]
Total loans	6,569	6,947
HELOC [Member] | Pass [Member]
Total loans	6,454	6,832
HELOC [Member] | Substandard [Member]
Total loans	115	115
CON [Member]
Total loans	4,988	4,574
CON [Member] | Pass [Member]
Total loans	$ 4,988	$ 4,574