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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