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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