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Fair Value of Financial Instruments and Fair Value Measurements (Details Textual) (USD $)	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Fair Value of Financial Instruments And Fair Value Measurements [Line Items]
Impaired Financing Receivable, Related Allowance	$ 1,036,000	$ 951,000	$ 951,000
Impaired Loans Carrying Value		$ 15,400,000	$ 16,800,000

X

- Details

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Namespace Prefix:	lark_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

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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 allowance for credit losses related to recorded investment.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 310

-SubTopic 10

-Section 50

-Paragraph 15

-Subparagraph (a)(3)

-URI http://asc.fasb.org/extlink&oid=28368275&loc=d3e5212-111524

+ Details

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Balance Type:	credit
Period Type:	instant