Loans - Transactions In The Allowance For Loan Losses ("ALL") (Detail) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020
Balance	$ 3,342	$ 2,875
Provision for loan losses	205	480
Charge-offs		(35)
Recoveries	43	22
Balance	3,590	3,342
CRE [Member]
Balance	753	781
Provision for loan losses	80	(28)
Balance	833	753
MF [Member]
Balance	60	23
Provision for loan losses	20	37
Balance	80	60
C+I [Member]
Balance	267	350
Provision for loan losses	(112)	(85)
Recoveries	39	2
Balance	194	267
ADL [Member]
Balance	174	145
Provision for loan losses	4	29
Balance	178	174
RES [Member]
Balance	1,656	1,503
Provision for loan losses	482	134
Recoveries	1	19
Balance	2,139	1,656
HELOC [Member]
Balance	78	52
Provision for loan losses	(15)	26
Balance	63	78
CON [Member]
Balance	52	18
Provision for loan losses	20	68
Charge-offs		(35)
Recoveries	3	1
Balance	75	52
Unallocated [Member]
Balance	302	3
Provision for loan losses	(274)	299
Balance	$ 28	$ 302