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Covid-19 Pandemic (Details Narrative) $ in Thousands		3 Months Ended
	Apr. 30, 2020 USD ($) Number	Mar. 31, 2020 USD ($)
Short-Term Repayment Plans [Member] | One-to-Four Family Residential Real Estate Loans [Member]
Loan payments on outstanding loan balances		$ 682
COVID-19 Loan Modification [Member] | Subsequent Event [Member]
Loan payments on outstanding loan balances	$ 4,350
COVID-19 Loan Modification [Member] | Subsequent Event [Member] | Small Business Administration [Member]
Number of loans, originated | Number	739
Proceeds from loan originations, value	$ 123,600
COVID-19 Loan Modification [Member] | Subsequent Event [Member] | Short-Term Repayment Plans [Member] | One-to-Four Family Residential Real Estate Loans [Member]
Mortgage loans	$ 1,600

X

- Definition

Mortgage loans.

+ References

No definition available.

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Namespace Prefix:	LARK_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

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- Definition

Number of loans, originated

+ References

No definition available.

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- Definition

Cash payments for and related to principal collection on loans related to operating activities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 25
-Subparagraph (g)
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3536-108585

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- Definition

Cash inflow associated with loan origination (the process when securing a mortgage for a piece of real property) or lease origination.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 12
-URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3179-108585

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