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Fair Value of Financial Instruments and Fair Value Measurements (Details Narrative) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Fair Value Disclosures [Abstract] |  |  |
Impaired loan balance | $ 4,300,000 | $ 4,129,000 | $ 6,718,000
Impaired loss | 1,700,000 | 755,000 |
Related allowance recorded | $ 311,000 | $ 654,000 | $ 504,000

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