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Loan Commitments (Details Narrative) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Loan Commitments [Abstract] |  |
Letters of credit outstanding, amount | $ 125,400 | $ 86,700
Standby letters of credit | $ 1,900 | $ 1,400

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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