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Loan Commitments (Details Narrative) - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Loan Commitments [Abstract]
Letters of credit outstanding, amount	$ 86,700	$ 87,600
Standby letters of credit	$ 1,400	$ 806

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- References

No definition available.

+ Details

Name:	LARK_LoanCommitmentsAbstract
Namespace Prefix:	LARK_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

The total amount of the contingent obligation under standby letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

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

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- Definition

The total amount of the contingent obligation under letters of credit outstanding as of the reporting date.

+ References

No definition available.

+ Details

Name:	us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant