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Deposits (Details Textual) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Banking And Thrift [Line Items]
Time Deposits 250000 Or More	$ 10.6	$ 21.7

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- References

No definition available.

+ Details

Name:	lark_BankingAndThriftLineItems
Namespace Prefix:	lark_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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- Definition

The aggregate amount of domestic and foreign time deposit liabilities (including certificates of deposits, individual retirement accounts and open accounts) in denominations of $250,000 or more.

+ References

No definition available.

+ Details

Name:	lark_TimeDeposits250000OrMore
Namespace Prefix:	lark_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant