Loans - Information About Loans And The ALL By Portfolio Segment Are Summarized (Detail) - USD ($) $ in Thousands	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Individually evaluated for impairment	$ 278	$ 969
Collectively evaluated for impairment	399,778	374,022
Total	400,056	374,991
Collectively evaluated for impairment	3,581	3,590
Total	3,581	3,590	$ 3,342
CRE [Member]
Individually evaluated for impairment		104
Collectively evaluated for impairment	80,506	71,953
Total	80,506	72,057
Collectively evaluated for impairment	942	833
Total	942	833	753
MF [Member]
Collectively evaluated for impairment	8,185	8,998
Total	8,185	8,998
Collectively evaluated for impairment	54	80
Total	54	80	60
C+I [Member]
Individually evaluated for impairment		28
Collectively evaluated for impairment	24,059	26,823
Total	24,059	26,851
Collectively evaluated for impairment	184	194
Total	184	194	267
ADL [Member]
Collectively evaluated for impairment	18,490	21,365
Total	18,490	21,365
Collectively evaluated for impairment	138	178
Total	138	178	174
RES [Member]
Individually evaluated for impairment	273	722
Collectively evaluated for impairment	251,193	233,477
Total	251,466	234,199
Collectively evaluated for impairment	2,048	2,139
Total	2,048	2,139	1,656
HELOC [Member]
Individually evaluated for impairment		115
Collectively evaluated for impairment	10,161	6,832
Total	10,161	6,947
Collectively evaluated for impairment	81	63
Total	81	63	78
CON [Member]
Individually evaluated for impairment	5
Collectively evaluated for impairment	7,184	4,574
Total	7,189	4,574
Collectively evaluated for impairment	100	75
Total	100	75	52
Unallocated [Member]
Collectively evaluated for impairment	34	28
Total	$ 34	$ 28	$ 302