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Fair Value of Financial Instruments and Fair Value Measurements - Schedule of Fair Value, Assets and Liabilities Measured On Nonrecurring Basis, Valuation Techniques (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2019 | Dec. 31, 2018
One-to-Four Family Residential Real Estate Loans [Member] |  |
Impaired loans | $ 128 | $ 110
Total (losses)/gains on impaired loans fair value disclosure | 28 | (29)
One-to-Four Family Residential Real Estate Loans [Member] | Level 1 [Member] |  |
Impaired loans |  |
One-to-Four Family Residential Real Estate Loans [Member] | Level 2 [Member] |  |
Impaired loans |  |
One-to-Four Family Residential Real Estate Loans [Member] | Level 3 [Member] |  |
Impaired loans | 128 | 110
Construction and Land Loan [Member] |  |
Impaired loans | 429 | 322
Total (losses)/gains on impaired loans fair value disclosure | (88) | (103)
Construction and Land Loan [Member] | Level 1 [Member] |  |
Impaired loans |  |
Construction and Land Loan [Member] | Level 2 [Member] |  |
Impaired loans |  |
Construction and Land Loan [Member] | Level 3 [Member] |  |
Impaired loans | 429 | 322
Commercial Real Estate Loans [Member] |  |
Impaired loans | 1,685 | 1,725
Total (losses)/gains on impaired loans fair value disclosure | (207) | 377
Commercial Real Estate Loans [Member] | Level 1 [Member] |  |
Impaired loans |  |
Commercial Real Estate Loans [Member] | Level 2 [Member] |  |
Impaired loans |  |
Commercial Real Estate Loans [Member] | Level 3 [Member] |  |
Impaired loans | 1,685 | 1,725
Commercial Loans [Member] |  |
Impaired loans | 176 | 55
Total (losses)/gains on impaired loans fair value disclosure | (88) | (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 | $ 176 | 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
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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
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Namespace Prefix: | LARK_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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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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- Details
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- Details
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- Details
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