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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 | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018
One-to-Four Family Residential Real Estate Loans [Member] |  |
Impaired Loans Fair Value Disclosure | $ 240 | $ 110
Fair Value Measurements, Valuation Techniques | Sales comparison | Sales comparison
Fair Value Measurements, Unobservable inputs | Adjustment to appraised value | Adjustment to appraised value
One-to-Four Family Residential Real Estate Loans [Member] | Minimum [Member] |  |
Fair Value Measurements Range | 0.00% | 0.00%
One-to-Four Family Residential Real Estate Loans [Member] | Maximum [Member] |  |
Fair Value Measurements Range | 25.00% | 20.00%
Commercial Real Estate Loans [Member] |  |
Impaired Loans Fair Value Disclosure | $ 100 | $ 1,725
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 | 15.00% | 0.00%
Commercial Loans [Member] |  |
Impaired Loans Fair Value Disclosure | $ 678 | $ 55
Fair Value Measurements, Valuation Techniques | Sales comparison | Sales comparison
Fair Value Measurements, Unobservable inputs | Adjustment to comparable sales | Adjustment to comparable sales
Commercial Loans [Member] | Minimum [Member] |  |
Fair Value Measurements Range | 0.00% | 0.00%
Commercial Loans [Member] | Maximum [Member] |  |
Fair Value Measurements Range | 75.00% | 15.00%
Agriculture Loans [Member] |  |
Impaired Loans Fair Value Disclosure | $ 405 | $ 175
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 |  | 0.00%
Agriculture Loans [Member] | Minimum [Member] |  |
Fair Value Measurements Range | 0.00% |
Agriculture Loans [Member] | Maximum [Member] |  |
Fair Value Measurements Range | 30.00% |
Construction and Land Loan [Member] |  |
Impaired Loans Fair Value Disclosure |  | $ 322
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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- 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
Name: | LARK_ImpairedLoansFairValueDisclosure
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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