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

X

- 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

X

- 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