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Investment Securities (Details Narrative) - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Security owned and pledged as collateral, fair value	$ 305.3	$ 380.4
Investment [Member]
Equity method investment, ownership percentage	10.00%

X

- Definition

Security owned and pledged as collateral fair values.

+ References

No definition available.

+ Details

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

X

- Definition

The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 323
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 3
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147481687/323-10-50-3

+ Details

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Namespace Prefix:	us-gaap_
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Balance Type:	na
Period Type:	instant

X

- Details

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Namespace Prefix:
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Balance Type:
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