Stock Compensation Plan (Details 4) (USD $) In Thousands, unless otherwise specified	Dec. 31, 2013
Unrecognized Compensation Cost Nonvested Awards [Line Items]
2014	$ 22
2015	8
Total	$ 30

Aggregate unrecognized cost of option awards made to employees under a stock option plan or plans for next twelve months that have yet to vest.

No definition available.

Name:	lark_EmployeeServiceShareBasedCompensationNonvestedAwardsTotalCompensationCostNotYetRecognizedStockOptionsForNextTwelveMonth
Namespace Prefix:	lark_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant