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Loans and Allowance for Credit Losses on Loans - Internal Risk Rating Of Loans By Portfolio Segment (Detail) - USD ($)
$ in Thousands
Jun. 30, 2023
Dec. 31, 2022
Total loans $ 414,512 $ 400,056
Pass [Member]    
Total loans   397,281
Special Mention [Member]    
Total loans   2,686
Substandard [Member]    
Total loans   89
CRE [Member]    
Total loans 88,051 80,506
CRE [Member] | Pass [Member]    
Total loans   77,820
CRE [Member] | Special Mention [Member]    
Total loans   2,686
MF [Member]    
Total loans 7,787 8,185
MF [Member] | Pass [Member]    
Total loans   8,185
C+I [Member]    
Total loans 24,168 24,059
C+I [Member] | Pass [Member]    
Total loans   24,059
ADL [Member]    
Total loans 14,999 18,490
ADL [Member] | Pass [Member]    
Total loans   18,490
RES [Member]    
Total loans 259,562 251,466
RES [Member] | Pass [Member]    
Total loans   251,382
RES [Member] | Substandard [Member]    
Total loans   84
HELOC [Member]    
Total loans 12,121 10,161
HELOC [Member] | Pass [Member]    
Total loans   10,161
CON [Member]    
Total loans $ 7,824 7,189
CON [Member] | Pass [Member]    
Total loans   7,184
CON [Member] | Substandard [Member]    
Total loans   $ 5