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Commitments and Contingencies - Additional Information (Detail) - Uwharrie Bank [Member]
3 Months Ended 9 Months Ended
Mar. 31, 2018
USD ($)
Option
Sep. 30, 2018
USD ($)
Lease for Branch [Member]    
Loss Contingencies [Line Items]    
Operating lease, term of contract 10 years  
Annual cost of lease $ 189,000  
Lease annual escalator percentage 2.00%  
Lease expiration year 2028  
Number of times to renew amended office lease option | Option 2  
Lease renewal option 5 years  
Commercial Property [Member]    
Loss Contingencies [Line Items]    
Operating lease, term of contract   5 years
Lease expiration date   Sep. 30, 2021
Annual cost of lease   $ 156,000
Lease annual escalator percentage   2.625%