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Fair Value of Financial Instruments and Fair Value Measurements - Schedule of Fair Value, Assets Measured on Nonrecurring Basis (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2019 | Dec. 31, 2018
One-to-Four Family Residential Real Estate Loans [Member] |  |
Impaired loans | $ 54 | $ 110
Real estate owned | 14 |
Total (losses)/gains on impaired loans fair value disclosure | (222) | (29)
Total (losses)/gains on real estate owned | (6) |
One-to-Four Family Residential Real Estate Loans [Member] | Level 1 [Member] |  |
Impaired loans |  |
Real estate owned |  |
One-to-Four Family Residential Real Estate Loans [Member] | Level 2 [Member] |  |
Impaired loans |  |
Real estate owned |  |
One-to-Four Family Residential Real Estate Loans [Member] | Level 3 [Member] |  |
Impaired loans | 54 | 110
Real estate owned | 14 |
Construction and Land [Member] |  |
Impaired loans | 185 | 322
Total (losses)/gains on impaired loans fair value disclosure | (6) | (103)
Construction and Land [Member] | Level 1 [Member] |  |
Impaired loans |  |
Construction and Land [Member] | Level 2 [Member] |  |
Impaired loans |  |
Construction and Land [Member] | Level 3 [Member] |  |
Impaired loans | 185 | 322
Commercial Real Estate[Member] |  |
Impaired loans | 91 | 1,725
Total (losses)/gains on impaired loans fair value disclosure | (112) | 377
Commercial Real Estate[Member] | Level 1 [Member] |  |
Impaired loans |  |
Commercial Real Estate[Member] | Level 2 [Member] |  |
Impaired loans |  |
Commercial Real Estate[Member] | Level 3 [Member] |  |
Impaired loans | 91 | 1,725
Commercial Loans [Member] |  |
Impaired loans | 691 | 55
Total (losses)/gains on impaired loans fair value disclosure | (164) | (51)
Commercial Loans [Member] | Level 1 [Member] |  |
Impaired loans |  |
Commercial Loans [Member] | Level 2 [Member] |  |
Impaired loans |  |
Commercial Loans [Member] | Level 3 [Member] |  |
Impaired loans | $ 691 | 55
Agriculture Loans [Member] |  |
Impaired loans |  | 175
Total (losses)/gains on impaired loans fair value disclosure |  | 11
Agriculture Loans [Member] | Level 1 [Member] |  |
Impaired loans |  |
Agriculture Loans [Member] | Level 2 [Member] |  |
Impaired loans |  |
Agriculture Loans [Member] | Level 3 [Member] |  |
Impaired loans |  | $ 175

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- Definition Gain Loss On Impaired Loans Fair Value Disclosure + References No definition available. + Details
Name: | LARK_GainLossOnImpairedLoansFairValueDisclosure
Namespace Prefix: | LARK_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Definition This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as impaired loans disclosure. + References No definition available. + Details
Name: | LARK_ImpairedLoansFairValueDisclosure
Namespace Prefix: | LARK_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Real estate owned fair value disclosure. + References No definition available. + Details
Name: | LARK_RealEstateOwnedFairValueDisclosure
Namespace Prefix: | LARK_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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- Definition Total (losses)/gains on real estate owned. + 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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- Details
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- Details
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- Details
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- Details
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- Details
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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Namespace Prefix: |
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Balance Type: |
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- Details
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Namespace Prefix: |
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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |