CONSOLIDATED STATEMENTS OF EARNINGS [Parenthetical]	9 Months Ended
Sep. 30, 2014
Percentage Of Stocks Dividend	5.00%

The percentage rate used to calculate stock dividend payments.

No definition available.

Name:	lark_PercentageOfStocksDividend
Namespace Prefix:	lark_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration