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Schedule of Loan to Directors Officers and Affiliated Parties (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2020 USD ($)
Receivables [Abstract]
Balance at December 31, 2019	$ 14,203
New loans	12,872
Repayments	(10,981)
Balance at December 31, 2020	$ 16,094

X

- Definition

Issuance of loans and unfunded commitments.

+ References

No definition available.

+ Details

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Period Type:	duration

X

- Definition

Loans and unfunded commitments.

+ References

No definition available.

+ Details

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

X

- Definition

Proceeds from loans and unfunded commitments.

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No definition available.

+ Details

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

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- References

No definition available.

+ Details

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