XML 51 R39.htm IDEA: XBRL DOCUMENT v3.10.0.1

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, 2018 USD ($) Number	Dec. 31, 2017 USD ($) Number
Financing receivable, modifications, recorded investment, non accrual balance	$ 5,557	$ 6,041
One-To-Four Family Residential Real Estate Loan [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	$ 185	$ 194
Construction and Land Loan [Member]
Troubled debt restructurings, Number of loans | Number	4	4
Financing receivable, modifications, recorded investment, non accrual balance	$ 527	$ 575
Financing receivable, modifications, recorded investment, accruing balance	$ 945	$ 1,252
Commercial Real Estate Loan [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	$ 2,124	$ 2,133
Commercial Loan [Member]
Troubled debt restructurings, Number of loans | Number	1
Financing receivable, modifications, recorded investment, non accrual balance	$ 41
Financing receivable, modifications, recorded investment, accruing balance
Agriculture Loan [Member]
Troubled debt restructurings, Number of loans | Number	4	9
Financing receivable, modifications, recorded investment, non accrual balance	$ 63	$ 471
Financing receivable, modifications, recorded investment, accruing balance	$ 234
Municipal Loan [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	$ 631	$ 1,091
Financing receivable, modifications, recorded investment, accruing balance	$ 3,546	$ 3,719

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://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

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://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

+ 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_ConstructionAndLandLoansMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

X

- Details

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

X

- Details

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

X

- Details

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

X

- Details

Name:	us-gaap_FinancialInstrumentAxis=LARK_MunicipalLoansMember
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: