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Loans and Allowance for Loan Losses (Details 4) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2014 Number	Dec. 31, 2013 Number
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of loans	11	11
Financing Receivable, Modifications, Recorded Investment, Non Accrual Balance	$ 624	$ 627
Financing Receivable, Modifications, Recorded Investment, Accruing Balance	6,876	6,920
Residential Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of loans	1	1
Financing Receivable, Modifications, Recorded Investment, Non Accrual Balance	0	0
Financing Receivable, Modifications, Recorded Investment, Accruing Balance	6	6
Construction Loans [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of loans	7	7
Financing Receivable, Modifications, Recorded Investment, Non Accrual Balance	624	627
Financing Receivable, Modifications, Recorded Investment, Accruing Balance	5,951	5,995
Commercial Real Estate [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of loans	1	1
Financing Receivable, Modifications, Recorded Investment, Non Accrual Balance	0	0
Financing Receivable, Modifications, Recorded Investment, Accruing Balance	278	278
Municipal Bonds [Member]
Financing Receivable, Modifications [Line Items]
Troubled debt restructurings, Number of loans	2	2
Financing Receivable, Modifications, Recorded Investment, Non Accrual Balance	0	0
Financing Receivable, Modifications, Recorded Investment, Accruing Balance	$ 641	$ 641

X

- Definition

Number of loans determined in financing receivables that have been modified by troubled debt restructurings.

+ References

No definition available.

+ Details

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X

- Definition

The amount of the outstanding recorded investment related to accruing balance of financing receivables that have been modified by troubled debt restructurings.

+ References

No definition available.

+ Details

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Balance Type:	debit
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X

- Definition

The amount of the outstanding recorded investment related to non accrual of financing receivables that have been modified by troubled debt restructurings.

+ References

No definition available.

+ Details

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Namespace Prefix:	lark_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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- Details

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