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Cover - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Mar. 25, 2025
Jun. 30, 2024
Cover [Abstract]      
Document Type 10-K    
Amendment Flag false    
Document Annual Report true    
Document Transition Report false    
Document Period End Date Dec. 31, 2024    
Document Fiscal Period Focus FY    
Document Fiscal Year Focus 2024    
Current Fiscal Year End Date --12-31    
Entity File Number 0-33203    
Entity Registrant Name LANDMARK BANCORP, INC.    
Entity Central Index Key 0001141688    
Entity Tax Identification Number 43-1930755    
Entity Incorporation, State or Country Code DE    
Entity Address, Address Line One 701 Poyntz Avenue    
Entity Address, City or Town Manhattan    
Entity Address, State or Province KS    
Entity Address, Postal Zip Code 66502    
City Area Code (785)    
Local Phone Number 565-2000    
Title of 12(b) Security Common Stock, par value $0.01 per share    
Trading Symbol LARK    
Security Exchange Name NASDAQ    
Entity Well-known Seasoned Issuer No    
Entity Voluntary Filers No    
Entity Current Reporting Status Yes    
Entity Interactive Data Current Yes    
Entity Filer Category Non-accelerated Filer    
Entity Small Business true    
Entity Emerging Growth Company false    
Entity Shell Company false    
Entity Public Float     $ 74.1
Entity Common Stock, Shares Outstanding   5,782,259  
Documents Incorporated by Reference Portions of the Proxy Statement for the Annual Meeting of Stockholders of the registrant to be held on May 21, 2025, are incorporated by reference in Part III hereof, to the extent indicated herein.    
ICFR Auditor Attestation Flag false    
Document Financial Statement Error Correction [Flag] false    
Auditor Opinion [Text Block] We have audited the accompanying consolidated balance sheets of Landmark Bancorp, Inc. and Subsidiaries (the “Company”) as of December 31, 2024 and 2023, the related consolidated statements of earnings, comprehensive income (loss), stockholders’ equity, and cash flows for each of the three years in the period ended December 31, 2024, and the related notes (collectively referred to as the “financial statements”). In our opinion, the financial statements present fairly, in all material respects, the financial position of the Company as of December 31, 2024 and 2023, and the results of its operations and its cash flows for each of the three years in the period ended December 31, 2024, in conformity with accounting principles generally accepted in the United States of America. 

Explanatory Paragraph - Change in Accounting Principle

 

As discussed in Note 1 to the financial statements, the Company has changed its method of accounting for credit losses in 2023 due to the adoption of Accounting Standards Codification Topic 326, Financial Instruments – Credit Losses (ASC Topic 326). The Company adopted the new credit loss standard using the modified retrospective method such that prior period amounts are not adjusted and continue to be reported in accordance with previously applicable generally accepted accounting principles.

  		   
Auditor Name Crowe LLP    
Auditor Location Dallas, Texas    
Auditor Firm ID 173