XML 49 R37.htm IDEA: XBRL DOCUMENT v3.8.0.1

Loans and Allowance for Loan Losses - Schedule of Troubled Debt Restructurings On Financing Receivables (Details) $ in Thousands	9 Months Ended	12 Months Ended
	Sep. 30, 2017 USD ($) Number	Dec. 31, 2016 USD ($) Number
Troubled debt restructurings, Number of loans | Number	20	17
Financing Receivable, Modifications, Recorded Investment, Non Accrual Balance	$ 5,489	$ 2,746
One-To-Four Family Residential Real Estate [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	$ 198	$ 185
Commercial [Member]
Troubled debt restructurings, Number of loans | Number		2
Financing Receivable, Modifications, Recorded Investment, Non Accrual Balance		$ 342
Financing Receivable, Modifications, Recorded Investment, Accruing Balance		$ 13
Agriculture [Member]
Troubled debt restructurings, Number of loans | Number	8	4
Financing Receivable, Modifications, Recorded Investment, Non Accrual Balance	$ 883	$ 838
Municipal [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	140	258
Construction and Land [Member]
Financing Receivable, Modifications, Recorded Investment, Non Accrual Balance	578	588
Financing Receivable, Modifications, Recorded Investment, Accruing Balance	1,297	1,338
Commercial Real Estate [Member]
Financing Receivable, Modifications, Recorded Investment, Non Accrual Balance	60	64
Financing Receivable, Modifications, Recorded Investment, Accruing Balance	2,135	2,145
Agriculture [Member]
Financing Receivable, Modifications, Recorded Investment, Non Accrual Balance	361	268
Financing Receivable, Modifications, Recorded Investment, Accruing Balance		44
TDR [Member]
Financing Receivable, Modifications, Recorded Investment, Non Accrual Balance	999	920
Financing Receivable, Modifications, Recorded Investment, Accruing Balance	$ 3,770	$ 3,983
Construction and Land [Member]
Troubled debt restructurings, Number of loans | Number	4	4
Financing Receivable, Modifications, Recorded Investment, Non Accrual Balance	$ 786	$ 599
Commercial Real Estate [Member]
Troubled debt restructurings, Number of loans | Number	4	3
Financing Receivable, Modifications, Recorded Investment, Non Accrual Balance	$ 1,864	$ 300

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

Name:	LARK_FinancingReceivableModificationsRecordedInvestmentAccruing
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://www.xbrl.org/2003/role/presentationRef
-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

Name:	us-gaap_FinancingReceivableModificationsNumberOfContracts2
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://www.xbrl.org/2003/role/presentationRef
-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

+ Details

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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=LARK_OneToFourFamilyResidentialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=LARK_CommercialMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=LARK_AgricultureMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=LARK_MunicipalMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=LARK_ConstructionAndLandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=LARK_AgricultureOneMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=LARK_TDRMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=LARK_ConstructionAndLandMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

Name:	us-gaap_DefinedBenefitPlanByPlanAssetCategoriesAxis=us-gaap_CommercialRealEstateMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: