Loans - Internal Risk Rating Of Loans By Portfolio Segment (Detail) - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Total Loans	$ 374,991	$ 367,437
Pass [Member]
Total Loans	371,321	360,159
Special Mention [Member]
Total Loans	2,701	6,941
Substandard [Member]
Total Loans	969	337
CRE [Member]
Total Loans	72,057	66,166
CRE [Member] | Pass [Member]
Total Loans	69,252	63,191
CRE [Member] | Special Mention [Member]
Total Loans	2,701	2,858
CRE [Member] | Substandard [Member]
Total Loans	104	117
MF [Member]
Total Loans	8,998	6,619
MF [Member] | Pass [Member]
Total Loans	8,998	6,619
C+I [Member]
Total Loans	26,851	45,262
C+I [Member] | Pass [Member]
Total Loans	26,823	41,021
C+I [Member] | Special Mention [Member]
Total Loans		4,083
C+I [Member] | Substandard [Member]
Total Loans	28	158
ADL [Member]
Total Loans	21,365	23,145
ADL [Member] | Pass [Member]
Total Loans	21,365	23,145
RES [Member]
Total Loans	234,199	213,718
RES [Member] | Pass [Member]
Total Loans	233,477	213,656
RES [Member] | Substandard [Member]
Total Loans	722	62
HELOC [Member]
Total Loans	6,947	9,583
HELOC [Member] | Pass [Member]
Total Loans	6,832	9,583
HELOC [Member] | Substandard [Member]
Total Loans	115
CON [Member]
Total Loans	4,574	2,944
CON [Member] | Pass [Member]
Total Loans	$ 4,574	$ 2,944