XML 13 R49.htm IDEA: XBRL DOCUMENT
v3.20.1

Repurchase Agreements - Schedule of Repurchase Agreements (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets sold under agreements to repurchase, carrying amount | $ 8,952 | $ 17,548
U.S. Federal Agency Obligations [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets sold under agreements to repurchase, carrying amount | 1,503 | 1,978
Agency Mortgage-backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets sold under agreements to repurchase, carrying amount | 7,449 | 14,781
US Federal Treasury Obligations [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets sold under agreements to repurchase, carrying amount |  | 789
Overnight and Continuous [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets sold under agreements to repurchase, carrying amount | 8,952 | 17,548
Overnight and Continuous [Member] | U.S. Federal Agency Obligations [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets sold under agreements to repurchase, carrying amount | 1,503 | 1,978
Overnight and Continuous [Member] | Agency Mortgage-backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets sold under agreements to repurchase, carrying amount | 7,449 | 14,781
Overnight and Continuous [Member] | US Federal Treasury Obligations [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets sold under agreements to repurchase, carrying amount |  | 789
Up to 30 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets sold under agreements to repurchase, carrying amount |  |
Up to 30 Days [Member] | U.S. Federal Agency Obligations [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets sold under agreements to repurchase, carrying amount |  |
Up to 30 Days [Member] | Agency Mortgage-backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets sold under agreements to repurchase, carrying amount |  |
Up to 30 Days [Member] | US Federal Treasury Obligations [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets sold under agreements to repurchase, carrying amount |  |
30 - 90 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets sold under agreements to repurchase, carrying amount |  |
30 - 90 Days [Member] | U.S. Federal Agency Obligations [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets sold under agreements to repurchase, carrying amount |  |
30 - 90 Days [Member] | Agency Mortgage-backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets sold under agreements to repurchase, carrying amount |  |
30 - 90 Days [Member] | US Federal Treasury Obligations [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets sold under agreements to repurchase, carrying amount |  |
Greater Than 90 Days [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets sold under agreements to repurchase, carrying amount |  |
Greater Than 90 Days [Member] | U.S. Federal Agency Obligations [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets sold under agreements to repurchase, carrying amount |  |
Greater Than 90 Days [Member] | Agency Mortgage-backed Securities [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets sold under agreements to repurchase, carrying amount |  |
Greater Than 90 Days [Member] | US Federal Treasury Obligations [Member] |  |
Assets Sold under Agreements to Repurchase [Line Items] |  |
Assets sold under agreements to repurchase, carrying amount |  |

X
- Definition Carrying amount of assets sold under agreements to repurchase when the carrying amount (or market value, if higher than the carrying amount) of securities or other assets sold under repurchase agreements exceeds 10 percent of total assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(m)(1)(i)(A)(i)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
Name: | us-gaap_AssetsSoldUnderAgreementsToRepurchaseCarryingAmounts
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

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_AssetsSoldUnderAgreementsToRepurchaseLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis=LARK_USFederalAgencyObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis=LARK_AgencyMortgageBackedSecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AssetsSoldUnderAgreementsToRepurchaseAxis=LARK_USFederalTreasuryObligationsMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=LARK_OvernightAndContinuousMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=LARK_UptoThirtyDaysMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=LARK_ThirtyToNinetyDaysMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_AssetsSoldUnderAgreementsToRepurchaseMaturityPeriodsAxis=LARK_GreaterThanNinetyDaysMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |