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Earnings Per Share - Schedule of Earnings Per Share, Basic and Diluted (Details) (Parenthetical)	9 Months Ended	12 Months Ended
	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

X

- References

No definition available.

+ Details

Name:	us-gaap_EarningsPerShareAbstract
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration