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v3.22.1

Schedule of Loan to Directors Officers and Affiliated Parties (Details) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 USD ($)
Receivables [Abstract] |
Balance at December 31, 2020 | $ 16,094
New loans | 10,920
Repayments | (17,077)
Balance at December 31, 2021 | $ 9,937

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- Definition Issuance of loans and unfunded commitments. + References No definition available. + Details
Name: | LARK_IssuanceOfLoansAndUnfundedCommitments
Namespace Prefix: | LARK_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition Loans and unfunded commitments. + References No definition available. + Details
Name: | LARK_LoansAndUnfundedCommitments
Namespace Prefix: | LARK_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Proceeds from loans and unfunded commitments. + References No definition available. + Details
Name: | LARK_ProceedsFromLoansAndUnfundedCommitments
Namespace Prefix: | LARK_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_ReceivablesAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration