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Document and Entity Information (USD $)
 12 Months Ended
Dec. 31, 2014
Mar. 31, 2015
Jun. 30, 2014
Document And Entity Information Abstract      
Entity Registrant Name HAWTHORN BANCSHARES, INC.    
Entity Central Index Key 0000893847    
Trading Symbol hwbk    
Entity Current Reporting Status Yes    
Entity Voluntary Filers No    
Current Fiscal Year End Date --12-31    
Entity Filer Category Non-accelerated Filer    
Entity Well-known Seasoned Issuer No    
Entity Common Stock, Shares Outstanding   5,233,986dei_EntityCommonStockSharesOutstanding  
Entity Public Float     $ 50,199,289dei_EntityPublicFloat
Document Type 10-K    
Document Period End Date Dec. 31, 2014    
Amendment Flag false    
Document Fiscal Year Focus 2014    
Document Fiscal Period Focus FY