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Fair Value of Financial Instruments and Fair Value Measurements (Details Narrative) - USD ($)	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023
Fair Value Disclosures [Abstract]
Impaired loan balance	$ 5,400,000	$ 4,300,000
Impaired loss	1,900,000	1,700,000
Related allowance recorded	$ 513,000	$ 311,000

X

- Definition

Impaired allowance for loan loss

+ References

No definition available.

+ Details

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

X

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without a related allowance for credit losses.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of allowance for credit losses related to recorded investment.

+ References

No definition available.

+ Details

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

X

- References

No definition available.

+ Details

Name:	us-gaap_FairValueDisclosuresAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration