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Loans and Allowance for Loan Losses (Details 4) (USD $) In Thousands, unless otherwise specified | Mar. 31, 2013 Number | Dec. 31, 2012 Number
--- | --- | ---
Troubled debt restructurings, Number of loans | 11 | 13
Troubled debt restructurings, Loan Balance | $ 8,043 | $ 8,407
Residential Real Estate [Member] |  |
Troubled debt restructurings, Number of loans | 2 | 2
Troubled debt restructurings, Loan Balance | 474 | 493
Construction Loans [Member] |  |
Troubled debt restructurings, Number of loans | 7 | 7
Troubled debt restructurings, Loan Balance | 6,928 | 7,077
Commercial Loan [Member] |  |
Troubled debt restructurings, Number of loans | 0 | 2
Troubled debt restructurings, Loan Balance | 0 | 196
Municipal Bonds [Member] |  |
Troubled debt restructurings, Number of loans | 2 | 2
Troubled debt restructurings, Loan Balance | $ 641 | $ 641

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- Definition The amount of the outstanding loans recorded in investment related to financing receivables that have been modified by troubled debt restructurings. + References No definition available. + Details
Name: | lark_FinancingReceivableModificationsLoanBalances
Namespace Prefix: | lark_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

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- Definition Number of loans determined in financing receivables that have been modified by troubled debt restructurings. + References No definition available. + Details
Name: | lark_FinancingReceivableModificationsNumberOfLoans
Namespace Prefix: | lark_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | instant