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Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) (Parenthetical) | 9 Months Ended | 12 Months Ended
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Sep. 30, 2019 | Dec. 31, 2018
Earnings per share: |  |
Stock dividend, percentage | 5.00% | 5.00%

X
- Definition The percentage rate used to calculate stock dividend payments. + References No definition available. + Details
Name: | LARK_PercentageOfStocksDividend
Namespace Prefix: | LARK_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

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- References No definition available. + Details
Name: | us-gaap_EarningsPerShareAbstract
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration