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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 | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019
One-to-Four Family Residential Real Estate Loans [Member] |  |
Impaired Loans Fair Value Disclosure | $ 240 | $ 240
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% | 25.00%
Commercial Real Estate Loans [Member] |  |
Impaired Loans Fair Value Disclosure | $ 144 | $ 100
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% | 15.00%
Commercial Loans [Member] |  |
Impaired Loans Fair Value Disclosure | $ 661 | $ 678
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 | 69.00% | 75.00%
Agriculture Loans [Member] |  |
Impaired Loans Fair Value Disclosure | $ 140 | $ 405
Fair Value Measurements, Valuation Techniques | Sales comparison | Sales comparison
Fair Value Measurements, Unobservable inputs | Adjustment to appraised value | Adjustment to appraised value
Agriculture Loans [Member] | Minimum [Member] |  |
Fair Value Measurements Range | 0.00% | 0.00%
Agriculture Loans [Member] | Maximum [Member] |  |
Fair Value Measurements Range | 30.00% | 30.00%

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- Definition Fair Value Measurements, Valuation Techniques. + References No definition available. + Details
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Namespace Prefix: | LARK_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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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
Name: | LARK_FairValueMeasurementsSalesComparisonRange
Namespace Prefix: | LARK_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | instant

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- Definition Fair Value Measurements, Unobservable inputs. + References No definition available. + Details
Name: | LARK_FairValueMeasurementsUnobservableInputs
Namespace Prefix: | LARK_
Data Type: | xbrli:stringItemType
Balance Type: | na
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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- Details
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Namespace Prefix: |
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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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- Details
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
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- Details
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Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |