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Loans and Allowance for Loan Losses (Details Textual) (USD $)	3 Months Ended	12 Months Ended							3 Months Ended
	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2013 Mortgage Loans On Real Estate [Member]	Dec. 31, 2012 Mortgage Loans On Real Estate [Member]	Mar. 31, 2013 Minimum [Member]	Dec. 31, 2012 Maximum [Member]	Mar. 31, 2013 Construction Loans [Member]	Dec. 31, 2012 Construction Loans [Member]	Mar. 31, 2013 Residential Real Estate [Member]	Mar. 31, 2012 Residential Real Estate [Member]	Dec. 31, 2012 Residential Real Estate [Member]
Impaired Financing Receivable, Recorded Investment					$ 13,200,000	$ 14,500,000
Impaired Financing Receivable Loan Balance Charged Off	6,000
Increase (Decrease) in Undisbursed Loan Funds	13,000	15,000
Related allowance recorded	474,000	901,000	332,000	521,000			332,000	388,000	28,000		165,000
Financing Receivable Outstanding Unpaid Principal Balance									277,800,000		263,500,000
Provision For Mortgage Repurchase Reserve									169,000	119,000
Mortgage Loans On Real Estate Reserve Amount	$ 418,000	$ 418,000

X

- Definition

An outstanding amount of unpaid principal balance of financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

No definition available.

+ Details

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Namespace Prefix:	lark_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount of loan balance of impaired financing receivables for charged off during the period.

+ References

No definition available.

+ Details

Name:	lark_ImpairedFinancingReceivableLoanBalanceChargedOff
Namespace Prefix:	lark_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of provisions against the mortgage repurchase reserve during period.

+ References

No definition available.

+ Details

Name:	lark_ProvisionForMortgageRepurchaseReserve
Namespace Prefix:	lark_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

X

- Definition

Amount of investment of impaired financing receivables with related allowance for credit losses and without 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

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- 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=7512638&loc=d3e5212-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

The increase (decrease) during the reporting period in undistributed cash for loans that have been granted but not entirely funded.

+ References

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

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 95

-Paragraph 28

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=6943989&loc=d3e3602-108585

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

X

- Definition

The amount of any write-down or reserve provided in the period on a mortgage loan on real estate.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 948

-SubTopic 310

-Section S99

-Paragraph 1

-Subparagraph (SX 210.12-29.7)

-URI http://asc.fasb.org/extlink&oid=6589523&loc=d3e617274-123014



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 205

-SubTopic 10

-Section S99

-Paragraph 6

-Subparagraph (SX 210.5-04.(c) Schedule IV)

-URI http://asc.fasb.org/extlink&oid=6882300&loc=d3e5864-122674



Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 29

-Article 12



Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph c

-Subparagraph Schedule IV

-Article 5

+ Details

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