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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	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
One-to-Four Family Residential Real Estate Loans [Member]
Impaired loans	$ 240	$ 110
Total (losses)/gains on real estate owned	(15)	(29)
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	110
Commercial Real Estate Loans [Member]
Impaired loans	100	1,725
Total (losses)/gains on real estate owned	(103)	377
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	100	1,725
Commercial Loans [Member]
Impaired loans	678	55
Total (losses)/gains on real estate owned	(177)	(51)
Commercial Loans [Member] | Level 1 [Member]
Impaired loans
Commercial Loans [Member] | Level 2 [Member]
Impaired loans
Commercial Loans [Member] | Level 3 [Member]
Impaired loans	678	55
Agriculture Loans [Member]
Impaired loans	405	175
Total (losses)/gains on real estate owned	(93)	11
Agriculture Loans [Member] | Level 1 [Member]
Impaired loans
Agriculture Loans [Member] | Level 2 [Member]
Impaired loans
Agriculture Loans [Member] | Level 3 [Member]
Impaired loans	$ 405	175
Construction and Land [Member]
Impaired loans		322
Total (losses)/gains on real estate owned		(103)
Construction and Land [Member] | Level 1 [Member]
Impaired loans
Construction and Land [Member] | Level 2 [Member]
Impaired loans
Construction and Land [Member] | Level 3 [Member]
Impaired loans		$ 322

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

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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

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Namespace Prefix:	LARK_
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Period Type:	duration

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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- Details

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