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Fair Value of Financial Instruments and Fair Value Measurements (Details Textual) (USD $) | Mar. 31, 2013 | Dec. 31, 2012
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Impaired Financing Receivable With Related Allowance Recorded Investment | $ 474,000 | $ 901,000
Impaired Loans Carrying Value | $ 13,200,000 | $ 14,500,000

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- Definition The carrying amount of impaired loans with an allocated allowance. + References No definition available. + Details
Name: | lark_ImpairedLoansCarryingValue
Namespace Prefix: | lark_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Amount of investment in impaired financing receivables for which there is a related allowance for credit losses. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 14A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7512638&loc=SL6953550-111524 + Details
Name: | us-gaap_ImpairedFinancingReceivableWithRelatedAllowanceRecordedInvestment
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant