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Fair Value of Financial Instruments and Fair Value Measurements - Schedule of Fair Value Contractual Balance and Gain Loss on Loans Held for Sale (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
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Sep. 30, 2019 | Dec. 31, 2018
Fair Value Disclosures [Abstract] |  |
Aggregate fair value | $ 15,049 | $ 4,743
Contractual balance | 14,906 | 4,687
Gain | $ 143 | $ 56

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- Definition Represent the value of gain or loss on loans held for sale. + References No definition available. + Details
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Namespace Prefix: | LARK_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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

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- Definition Fair value portion of loans held-for-sale including, but not limited to, mortgage loans and finance receivables. + References No definition available. + Details
Name: | us-gaap_LoansHeldForSaleFairValueDisclosure
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition The face amount of loans that will be sold to other entities. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118952595&loc=d3e4428-111522 + Details
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Namespace Prefix: | us-gaap_
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Balance Type: | debit
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