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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

X

- 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

X

- 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