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v3.19.1

Loan Commitments (Details Narrative) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
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Loan Commitments [Abstract] |  |
Letters of credit outstanding, amount | $ 86,700 | $ 87,600
Standby letters of credit | $ 1,400 | $ 806

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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