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Deposits (Details Narrative) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
Deposits - Schedule Of Maturities Of Time Deposit |  |
Time deposits in denominations during the period | Aggregate amount of time deposits in denominations of $250,000 |
Time deposits in denominations of $250,000 or more | $ 41,300 | $ 14,200
Brokered time deposits | $ 21,800 | $ 61,900
Time deposits maturity description | Mature during 2020 | Matured during 2019

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

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

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- Definition Time deposits maturity description. + References No definition available. + Details
Name: | LARK_TimeDepositsMaturityDescription
Namespace Prefix: | LARK_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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