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Regulatory Capital Requirements - Schedule of Compliance with Regulatory Capital Requirements under Banking Regulations (Details) (Parenthetical)	6 Months Ended	12 Months Ended
	Jun. 30, 2018	Dec. 31, 2017
Banks Regulatory Capital Requirements [Member]
Tier one capital conversation buffer	1.875%	1.25%

X

- Definition

The percentage of capital buffer to be maintained other than minimum capital requirements.

+ References

No definition available.

+ Details

Name:	LARK_TierOneCapitalConversationBuffer
Namespace Prefix:	LARK_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Details

Name:	dei_LegalEntityAxis=LARK_BanksRegulatoryCapitalRequirementsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: