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Fair Value of Financial Instruments and Fair Value Measurements - Schedule of Fair Value Measurements on Nonrecurring, Valuation Techniques (Details) - Fair Value, Measurements, Nonrecurring [Member] - USD ($) $ in Thousands | 6 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2018 | Dec. 31, 2017
One-To-Four Family Residential Real Estate Loan [Member] |  |
Impaired Loans Fair Value Disclosure | $ 171 | $ 171
Real Estate Owned Fair Value Disclosure |  | $ 325
Fair Value Measurements, Valuation Techniques | Sales comparison | Sales comparison
Fair Value Measurements, Unobservable inputs | Adjustment to appraised value | Adjustment to appraised value
Fair Value Measurements Range |  | 10.00%
One-To-Four Family Residential Real Estate Loan [Member] | Minimum [Member] |  |
Fair Value Measurements Range | 7.00% | 16.00%
One-To-Four Family Residential Real Estate Loan [Member] | Maximum [Member] |  |
Fair Value Measurements Range | 50.00% | 50.00%
Commercial Real Estate Loan [Member] |  |
Impaired Loans Fair Value Disclosure | $ 1,779 |
Commercial Real Estate Loan [Member] |  |
Impaired Loans Fair Value Disclosure |  | $ 33
Real Estate Owned Fair Value Disclosure |  | $ 85
Fair Value Measurements, Valuation Techniques | Sales comparison | Sales comparison
Fair Value Measurements, Unobservable inputs | Adjustment to appraised value | Adjustment to appraised value
Fair Value Measurements Range |  | 10.00%
Commercial Real Estate Loan [Member] | Minimum [Member] |  |
Fair Value Measurements Range | 7.00% | 0.00%
Commercial Real Estate Loan [Member] | Maximum [Member] |  |
Fair Value Measurements Range | 25.00% | 91.00%
Commercial Loan [Member] |  |
Impaired Loans Fair Value Disclosure | $ 1,301 | $ 1,600
Fair Value Measurements, Valuation Techniques | Sales comparison | Sales comparison
Fair Value Measurements, Unobservable inputs | Adjustment to comparable sales | Adjustment to comparable sales
Commercial Loan [Member] | Minimum [Member] |  |
Fair Value Measurements Range | 10.00% | 15.00%
Commercial Loan [Member] | Maximum [Member] |  |
Fair Value Measurements Range | 25.00% | 50.00%
Agriculture Loan [Member] |  |
Impaired Loans Fair Value Disclosure | $ 233 | $ 264
Fair Value Measurements, Valuation Techniques | Sales comparison | Sales comparison
Fair Value Measurements, Unobservable inputs | Adjustment to appraised value | Adjustment to appraised value
Agriculture Loan [Member] | Minimum [Member] |  |
Fair Value Measurements Range | 0.00% | 0.00%
Agriculture Loan [Member] | Maximum [Member] |  |
Fair Value Measurements Range | 50.00% | 50.00%
Construction and Land Loan [Member] |  |
Impaired Loans Fair Value Disclosure |  | $ 1,499
Fair Value Measurements, Valuation Techniques |  | Sales comparison
Fair Value Measurements, Unobservable inputs |  | Adjustment to appraised value
Construction and Land Loan [Member] | Minimum [Member] |  |
Fair Value Measurements Range |  | 0.00%
Construction and Land Loan [Member] | Maximum [Member] |  |
Fair Value Measurements Range |  | 25.00%

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- Definition Fair Value Measurements, Valuation Techniques. + References No definition available. + Details
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Data Type: | xbrli:stringItemType
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- Definition The range of Level 3 fair value measurements for impaired loans measured at fair value on a non-recurring basis. + References No definition available. + Details
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Data Type: | num:percentItemType
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- Definition Fair Value Measurements, Unobservable inputs. + References No definition available. + Details
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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
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- Definition Represents the amount of real estate owned fair value disclosure. + References No definition available. + Details
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Namespace Prefix: | LARK_
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Balance Type: | debit
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- Details
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- Details
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- Details
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