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Deposits (Details Narrative) - USD ($) $ in Millions | 12 Months Ended |
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Dec. 31, 2021 | Dec. 31, 2020
Time Deposit Liabilities, Description | The aggregate amount of certificate of deposit in denominations of $250,000 or more |
Time Deposits, at or Above FDIC Insurance Limit | $ 23.4 | $ 26.8
Brokered time deposits |  | $ 0.0

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- Definition Brokered time deposits. + References No definition available. + Details
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Namespace Prefix: | LARK_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Description of time deposits (deposits that do not mature until a specific date and for which there may be penalties for withdrawing prior to maturity) held by the entity, which may include a description of the types and repayment terms of the deposits, the amount of the liabilities recognized for the deposits, the aggregate amount of time deposits (including certificates of deposit) in denominations of less than $100,000, and the aggregate amount of time deposits (including certificates of deposit) in denominations of $100,000 or more. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818 + Details
Name: | us-gaap_TimeDepositLiabilitiesDescription
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Definition Amount of time deposit liabilities, including certificates of deposit, in denominations that meet or exceed the Federal Deposit Insurance Corporation (FDIC) insurance limit. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 405 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=116652737&loc=d3e64164-112818 + Details
Name: | us-gaap_TimeDepositsAtOrAboveFDICInsuranceLimit
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant