XML 90 R76.htm IDEA: XBRL DOCUMENT
v3.21.1

Subordinated Debentures (Details Narrative) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2013 | Dec. 31, 2005 | Dec. 31, 2003
Deffered Tax Assets Investment Impairments |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  |  | $ 8.2
Debt instruments, due date, year |  |  |  |  |  | 2034
Debt instrument, description of variable rate basis |  |  |  |  |  | Interest accrues at three month LIBOR plus 2.85%.
Subordinated borrowing, interest rate | 3.06% | 4.79% |  |  |  |
Deffered Tax Assets Investment Impairments | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |
Debt variable rate |  |  | 2.85% |  |  |
Deffered Tax Assets Loans And Allowance For Loan Losses |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  |  | $ 8.2 |
Debt instruments, due date, year |  |  |  |  | 2036 |
Debt instrument, description of variable rate basis |  |  |  |  | Interest accrues at three month LIBOR plus 1.34%. |
Subordinated borrowing, interest rate | 1.56% | 3.23% |  |  |  |
Deffered Tax Assets Loans And Allowance For Loan Losses | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |
Debt variable rate |  |  | 1.34% |  |  |
Deffered Tax Assets Defferred Compensation Agreements |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |
Proceeds from issuance of debt |  |  |  | $ 5.2 |  |
Debt instruments, due date, year |  |  |  | 2036 |  |
Debt instrument, description of variable rate basis |  |  |  | Interest accrues at three month LIBOR plus 1.62%. |  |
Subordinated borrowing, interest rate | 1.86% | 3.55% |  |  |  |
Deffered Tax Assets Defferred Compensation Agreements | London Interbank Offered Rate (LIBOR) [Member] |  |  |  |  |  |
Subordinated Borrowing [Line Items] |  |  |  |  |  |
Debt variable rate |  |  | 1.62% |  |  |

X
- Definition Year the original debt was scheduled to mature, in CCYY format. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4304-108586 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=121583591&loc=d3e4332-108586 + Details
Name: | us-gaap_DebtConversionOriginalDebtDueDateOfDebtYear
Namespace Prefix: | us-gaap_
Data Type: | us-types:gYearListItemType
Balance Type: | na
Period Type: | duration

X
- Definition Percentage points added to the reference rate to compute the variable rate on the debt instrument. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentBasisSpreadOnVariableRate1
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition The reference rate for the variable rate of the debt instrument, such as LIBOR or the US Treasury rate and the maturity of the reference rate used, such as three months or six months LIBOR. + References No definition available. + Details
Name: | us-gaap_DebtInstrumentDescriptionOfVariableRateBasis
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Definition The cash inflow during the period from additional borrowings in aggregate debt. Includes proceeds from short-term and long-term debt. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 45 -Paragraph 14 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121586364&loc=d3e3255-108585 + Details
Name: | us-gaap_ProceedsFromIssuanceOfDebt
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration

X
- Definition Stated interest rate of the subordinated debt. + References No definition available. + Details
Name: | us-gaap_SubordinatedBorrowingInterestRate
Namespace Prefix: | us-gaap_
Data Type: | num:percentItemType
Balance Type: | na
Period Type: | duration

X
- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
Name: | us-gaap_SubordinatedBorrowingLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_SubordinatedBorrowingAxis=LARK_SubordinatedDebenturesTwoThousandThreeMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_VariableRateAxis=us-gaap_LondonInterbankOfferedRateLIBORMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubordinatedBorrowingAxis=LARK_SubordinatedDebenturesTwoThousandFiveMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_SubordinatedBorrowingAxis=LARK_SubordinatedDebenturesTwoThousandThirteenMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |