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Loans and Allowance for Loan Losses (Details Textual) (USD $)	3 Months Ended						3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Dec. 31, 2012	Mar. 31, 2014 Mortgage Loans on Real Estate [Member]	Dec. 31, 2013 Mortgage Loans on Real Estate [Member]	Mar. 31, 2014 Mortgage Repurchase [Member]	Mar. 31, 2014 Residential Real Estate [Member]	Mar. 31, 2013 Residential Real Estate [Member]	Dec. 31, 2013 Residential Real Estate [Member]
Accounts, Notes, Loans and Financing Receivable [Line Items]
Related allowance recorded	$ 1,036,000	$ 951,000	$ 951,000	$ 61,000	$ 234,000		$ 77,000		$ 82,000
Financing Receivable Outstanding Unpaid Principal Balance							339,700,000		338,300,000
Provision For Mortgage Repurchase Reserve							229,000	169,000
Mortgage Loans On Real Estate Reserve Amount	454,000	468,000				5,000
Impaired Financing Receivable, Recorded Investment, Total	15,408,000	16,756,000					349,000		782,000
Provision For Mortgage Loan losses	$ 19,000

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

It represents the amount of provision for mortgage loan losses.

+ References

No definition available.

+ Details

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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

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

X

- Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
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=28368275&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=28368275&loc=d3e5212-111524

+ Details

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

X

- Definition

Amount of reserve for write-down of a mortgage loan on real estate.

+ References

Reference 1: 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=27047687&loc=d3e5864-122674



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

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 29

-Article 12



Reference 3: 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



Reference 4: 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

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