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Investment Securities (Details Narrative) - USD ($) $ in Millions | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | ---
Security owned and pledged as collateral, fair value | $ 420.8 | $ 331.7
Investment [Member] |  |
Equity method investment, ownership percentage | 10.00% |

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- Definition Security owned and pledged as collateral fair values. + References No definition available. + Details
Name: | LARK_SecurityOwnedAndPledgedAsCollateralFairValues
Namespace Prefix: | LARK_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The percentage of ownership of common stock or equity participation in the investee accounted for under the equity method of accounting. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 323 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a)(1) -URI https://asc.fasb.org/extlink&oid=114001798&loc=d3e33918-111571 + Details
Name: | us-gaap_EquityMethodInvestmentOwnershipPercentage
Namespace Prefix: | us-gaap_
Data Type: | dtr-types:percentItemType
Balance Type: | na
Period Type: | instant

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- Details
Name: | srt_ScheduleOfEquityMethodInvestmentEquityMethodInvesteeNameAxis=LARK_InvestmentMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |