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Document and Entity Information - shares
 3 Months Ended
Mar. 31, 2020
May 07, 2020
Document And Entity Information    
Entity Registrant Name LANDMARK BANCORP INC  
Entity Central Index Key 0001141688  
Document Type 10-Q/A  
Document Period End Date Mar. 31, 2020  
Amendment Flag true  
Amendment Description This Amendment No. 1 to the Quarterly Report on Form 10-Q/A (the "Amendment") amends the Quarterly Report on Form 10-Q of Landmark Bancorp, Inc. for the period ended March 31, 2020 (the "Original Filing") that was originally filed with the U.S. Securities and Exchange Commission on May 8, 2020. The Amendment is being filed to correct the tables in Part I, Item 2 "Management's Discussion and Analysis of Financial Condition and Results of Operations" on page 32 of the Original Filing relating to the diversification of industry types within the Company's commercial real estate and commercial loan categories. Due to a filing error, the tables in the Original Filing inadvertently omitted the table regarding the commercial loan portfolio and instead copied a table from page 33 of the Original Filing. In addition, due to filing errors, the amount of Tier 1 Capital of the Bank required for capital adequacy purposes at March 31, 2020 was erroneously stated as $567,884 on page 25 of the Original Filing, but has been corrected to $56,784 in the Amendment. Also, the amount of the Company's net interest rate spread for the three months ended March 31, 2020 was erroneously stated as 3.49% on page 36 of the Original Filing, but has been corrected to 3.50% in the Amendment. Additional immaterial changes were also made to the Original Filing to correct typographical errors. Except as described above, the Amendment does not modify any other disclosures presented in the Original Filing in any way.  
Current Fiscal Year End Date --12-31  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Accelerated Filer  
Entity Small Business Flag true  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   4,493,638
Document Fiscal Period Focus Q1  
Document Fiscal Year Focus 2020