Document and Entity Information - shares
9 Months Ended
Sep. 30, 2018
Nov. 14, 2018
Document And Entity Information  
Entity Registrant NameOptimumBank Holdings, Inc. 
Entity Central Index Key0001288855 
Document Type10-Q 
Document Period End DateSep. 30, 2018 
Amendment Flagfalse 
Current Fiscal Year End Date--12-31 
Entity Filer CategoryNon-accelerated Filer 
Entity Small Business Flagtrue 
Entity Emerging Growth Companyfalse 
Entity Ex Transition Periodfalse 
Entity Common Stock, Shares Outstanding 1,813,670
Trading SymbolOPHC 
Document Fiscal Period FocusQ3 
Document Fiscal Year Focus2018 

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