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Loans and Allowance for Loan Losses (Details 3) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Unpaid contractual principal	$ 15,257	$ 16,557
Impaired loan balance	13,233	14,533
Impaired loans without an allowance	10,373	10,268
Impaired loans with an allowance	2,860	4,265
Related allowance recorded	474	901
Year-to-date average loan balance	13,301	15,758
Year-to-date interest income recognized	65	344
Residential Real Estate [Member]
Unpaid contractual principal	1,047	1,029
Impaired loan balance	757	739
Impaired loans without an allowance	563	57
Impaired loans with an allowance	194	682
Related allowance recorded	28	165
Year-to-date average loan balance	769	767
Year-to-date interest income recognized	0	19
Construction Loans [Member]
Unpaid contractual principal	10,337	10,425
Impaired loan balance	8,603	8,691
Impaired loans without an allowance	6,301	6,334
Impaired loans with an allowance	2,302	2,357
Related allowance recorded	332	388
Year-to-date average loan balance	8,656	9,211
Year-to-date interest income recognized	60	302
Commercial Real Estate [Member]
Unpaid contractual principal	2,833	2,833
Impaired loan balance	2,833	2,833
Impaired loans without an allowance	2,833	2,833
Impaired loans with an allowance	0	0
Related allowance recorded	0	0
Year-to-date average loan balance	2,833	3,352
Year-to-date interest income recognized	0	0
Commercial Loan [Member]
Unpaid contractual principal	236	1,475
Impaired loan balance	236	1,475
Impaired loans without an allowance	3	395
Impaired loans with an allowance	233	1,080
Related allowance recorded	49	268
Year-to-date average loan balance	238	1,621
Year-to-date interest income recognized	0	3
Agriculture Loans [Member]
Unpaid contractual principal	5	5
Impaired loan balance	5	5
Impaired loans without an allowance	5	5
Impaired loans with an allowance	0	0
Related allowance recorded	0	0
Year-to-date average loan balance	5	8
Year-to-date interest income recognized	0	0
Municipal Bonds [Member]
Unpaid contractual principal	772	772
Impaired loan balance	772	772
Impaired loans without an allowance	641	641
Impaired loans with an allowance	131	131
Related allowance recorded	65	65
Year-to-date average loan balance	772	779
Year-to-date interest income recognized	5	20
Consumer Loan [Member]
Unpaid contractual principal	27	18
Impaired loan balance	27	18
Impaired loans without an allowance	27	3
Impaired loans with an allowance	0	15
Related allowance recorded	0	15
Year-to-date average loan balance	28	20
Year-to-date interest income recognized	$ 0	$ 0

X

- Definition

Average amount of investment in loan balances of impaired financing receivables with related allowance for credit losses and without a 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 interest income recognized that the financing receivables (with related allowance for credit losses and without a related allowance for credit losses) were impaired.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of loan balance of impaired financing receivables with related allowance for credit losses and without related allowance for credit losses.

+ References

No definition available.

+ Details

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

X

- Definition

Amount of loan balance of impaired financing receivables for which there is no related allowance for credit losses.

+ References

No definition available.

+ Details

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

X

- Definition

Loan balance of impaired financing receivables for which there is a related allowance for credit losses.

+ References

No definition available.

+ Details

Name:	lark_ImpairedFinancingReceivableWithRelatedAllowanceLoanBalance
Namespace Prefix:	lark_
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

Amount of unpaid principal balance of impaired financing receivables with related allowance for credit losses and without 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 15

-Subparagraph (a)(4)

-URI http://asc.fasb.org/extlink&oid=7512638&loc=d3e5212-111524

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