Cover - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Mar. 29, 2023	Jun. 30, 2022
Cover [Abstract]
Document Type	10-K
Amendment Flag	false
Document Annual Report	true
Document Transition Report	false
Document Period End Date	Dec. 31, 2022
Document Fiscal Period Focus	FY
Document Fiscal Year Focus	2022
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			$ 92.7
Entity Common Stock, Shares Outstanding		5,213,582
Documents Incorporated by Reference	Portions of the Proxy Statement for the Annual Meeting of Stockholders of the registrant to be held on May 24, 2023, are incorporated by reference in Part III hereof, to the extent indicated herein.
ICFR Auditor Attestation Flag	false
Auditor Name	Crowe LLP
Auditor Location	Dallas, Texas
Auditor Firm ID	173