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Loans and Allowance for Loan Losses - Schedule of Troubled Debt Restructurings on Financing Receivables (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2018 USD ($) Number	Dec. 31, 2017 USD ($) Number
One-to-Four Family Residential Real Estate Loans [Member]
Troubled debt restructurings, Number of loans | Number	2	2
Financing receivable, modifications, recorded investment, non accrual balance
Financing receivable, modifications, recorded investment, accruing balance	$ 181	$ 195
Construction and Land Loan [Member]
Troubled debt restructurings, Number of loans | Number	4	4
Financing receivable, modifications, recorded investment, non accrual balance	$ 523	$ 575
Financing receivable, modifications, recorded investment, accruing balance	$ 860	$ 1,252
Commercial Real Estate Loans [Member]
Troubled debt restructurings, Number of loans | Number	2	3
Financing receivable, modifications, recorded investment, non accrual balance		$ 45
Financing receivable, modifications, recorded investment, accruing balance	$ 2,121	$ 2,132
Commercial Loans [Member]
Troubled debt restructurings, Number of loans | Number	1
Financing receivable, modifications, recorded investment, non accrual balance	$ 36
Financing receivable, modifications, recorded investment, accruing balance
Agriculture Loans [Member]
Troubled debt restructurings, Number of loans | Number	4
Municipal Loans [Member]
Troubled debt restructurings, Number of loans | Number	1	2
Financing receivable, modifications, recorded investment, non accrual balance
Financing receivable, modifications, recorded investment, accruing balance	$ 58	$ 140
TDR [Member]
Troubled debt restructurings, Number of loans | Number	14	20
Financing receivable, modifications, recorded investment, non accrual balance	$ 582	$ 1,091
Financing receivable, modifications, recorded investment, accruing balance	3,455	$ 3,719
Agriculture Loans [Member]
Troubled debt restructurings, Number of loans | Number		9
Financing receivable, modifications, recorded investment, non accrual balance	23	$ 471
Financing receivable, modifications, recorded investment, accruing balance	$ 235

X

- Definition

The amount of the outstanding recorded investment related to accruing balance of financing receivables that have been modified by troubled debt restructurings.

+ References

No definition available.

+ Details

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

X

- Definition

Number of financing receivables that have been modified by troubled debt restructurings.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 33
-URI http://asc.fasb.org/extlink&oid=84173941&loc=SL6953676-111524

+ Details

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:integerItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Recorded investment in financing receivables that are on nonaccrual status as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 7
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5111-111524

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