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Fair Value of Financial Instruments and Fair Value Measurements - Schedule of Fair Value, Assets Measured On Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands	3 Months Ended	12 Months Ended
	Mar. 31, 2020	Dec. 31, 2019
One-to-Four Family Residential Real Estate Loans [Member]
Impaired loans	$ 240	$ 240
Total (losses)/gains on real estate owned	1	(15)
One-to-Four Family Residential Real Estate Loans [Member] | Level 1 [Member]
Impaired loans
One-to-Four Family Residential Real Estate Loans [Member] | Level 2 [Member]
Impaired loans
One-to-Four Family Residential Real Estate Loans [Member] | Level 3 [Member]
Impaired loans	240	240
Commercial Real Estate Loans [Member]
Impaired loans	144	100
Total (losses)/gains on real estate owned	51	(103)
Commercial Real Estate Loans [Member] | Level 1 [Member]
Impaired loans
Commercial Real Estate Loans [Member] | Level 2 [Member]
Impaired loans
Commercial Real Estate Loans [Member] | Level 3 [Member]
Impaired loans	144	100
Commercial Loans [Member]
Impaired loans	661	678
Total (losses)/gains on real estate owned	(31)	(177)
Commercial Loans [Member] | Level 1 [Member]
Impaired loans
Commercial Loans [Member] | Level 2 [Member]
Impaired loans
Commercial Loans [Member] | Level 3 [Member]
Impaired loans	661	678
Agriculture Loans [Member]
Impaired loans	140	405
Total (losses)/gains on real estate owned	70	(93)
Agriculture Loans [Member] | Level 1 [Member]
Impaired loans
Agriculture Loans [Member] | Level 2 [Member]
Impaired loans
Agriculture Loans [Member] | Level 3 [Member]
Impaired loans	$ 140	$ 405

X

- Definition

This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as impaired loans disclosure.

+ References

No definition available.

+ Details

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

X

- Definition

Total (losses)/gains on real estate owned.

+ References

No definition available.

+ Details

Name:	LARK_TotalLossesgainsOnRealEstateOwned
Namespace Prefix:	LARK_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Details

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Namespace Prefix:
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X

- Details

Name:	us-gaap_FinancialInstrumentAxis=LARK_OneToFourFamilyResidentialRealEstateMember
Namespace Prefix:
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X

- Details

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- Details

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- Details

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X

- Details

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Namespace Prefix:
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Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommercialLoanMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=LARK_AgricultureLoanMember
Namespace Prefix:
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Balance Type:
Period Type: