XML 71 R40.htm IDEA: XBRL DOCUMENT
v3.20.1

Loans and Allowance for Loan Losses - Schedule of Troubled Debt Restructurings on Financing Receivables (Details) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 USD ($) Number | Dec. 31, 2019 USD ($) 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 | $ 165 | $ 168
Construction and Land Loan [Member] |  |
Troubled debt restructurings, Number of loans | Number | 4 | 4
Financing receivable, modifications, recorded investment, non accrual balance | $ 508 | $ 510
Financing receivable, modifications, recorded investment, accruing balance | $ 523 | $ 581
Commercial Real Estate Loans [Member] |  |
Troubled debt restructurings, Number of loans | Number | 1 | 1
Financing receivable, modifications, recorded investment, non accrual balance |  |
Financing receivable, modifications, recorded investment, accruing balance | $ 2,021 | $ 2,021
Commercial Loans [Member] |  |
Troubled debt restructurings, Number of loans | Number | 1 | 1
Financing receivable, modifications, recorded investment, non accrual balance |  |
Financing receivable, modifications, recorded investment, accruing balance | $ 28 | $ 28
Agriculture Loans [Member] |  |
Troubled debt restructurings, Number of loans | Number | 4 | 4
Financing receivable, modifications, recorded investment, non accrual balance |  |
Financing receivable, modifications, recorded investment, accruing balance | $ 243 | $ 278
Municipal Loans [Member] |  |
Troubled debt restructurings, Number of loans | Number | 1 | 1
Financing receivable, modifications, recorded investment, non accrual balance |  |
Financing receivable, modifications, recorded investment, accruing balance | $ 58 | $ 58
Troubled Debt Restructurings [Member] |  |
Troubled debt restructurings, Number of loans | Number | 13 | 13
Financing receivable, modifications, recorded investment, non accrual balance | $ 508 | $ 510
Financing receivable, modifications, recorded investment, accruing balance | $ 3,038 | $ 3,134

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/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 33 -URI http://asc.fasb.org/extlink&oid=121611835&loc=SL6953676-111524 + Details
Name: | us-gaap_FinancingReceivableModificationsNumberOfContracts2
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
Period Type: | duration

X
- Definition Amount of financing receivable on nonaccrual status. + 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=121611835&loc=d3e5111-111524 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 20 -Section 50 -Paragraph 16 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=121599337&loc=SL82919258-210447 + 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_TroubledDebtRestructuringsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |