XML 64 R51.htm IDEA: XBRL DOCUMENT
v3.22.1

Schedule of Available for Sale Securities Continuous Unrealized Loss Position Fair Value (Details) $ in Thousands | Dec. 31, 2021 USD ($) Integer | Dec. 31, 2020 USD ($) Integer
--- | --- | ---
Investment Holdings [Line Items] |  |
No. of securities | Integer | 112 | 16
Less than 12 months, Fair value | $ 170,989 | $ 15,963
Less than 12 months, Unrealized losses | (1,904) | (30)
12 months or longer, Fair value | 4,927 |
12 months or longer, Unrealized losses | (23) |
Total, Fair value | 175,916 | 15,963
Total, Unrealized losses | $ (1,927) | $ (30)
US Treasury Securities [Member] |  |
Investment Holdings [Line Items] |  |
No. of securities | Integer | 28 |
Less than 12 months, Fair value | $ 42,675 |
Less than 12 months, Unrealized losses | (423) |
12 months or longer, Fair value |  |
12 months or longer, Unrealized losses |  |
Total, Fair value | 42,675 |
Total, Unrealized losses | $ (423) |
U.S. Federal Agency Obligations [Member] |  |
Investment Holdings [Line Items] |  |
No. of securities | Integer | 6 | 4
Less than 12 months, Fair value | $ 12,073 | $ 11,772
Less than 12 months, Unrealized losses | (30) | (18)
12 months or longer, Fair value | 3,048 |
12 months or longer, Unrealized losses | (7) |
Total, Fair value | 15,121 | 11,772
Total, Unrealized losses | $ (37) | $ (18)
Municipal Obligations, Tax Exempt [Member] |  |
Investment Holdings [Line Items] |  |
No. of securities | Integer | 37 | 12
Less than 12 months, Fair value | $ 12,411 | $ 4,191
Less than 12 months, Unrealized losses | (46) | (12)
12 months or longer, Fair value | 1,879 |
12 months or longer, Unrealized losses | (16) |
Total, Fair value | 14,290 | 4,191
Total, Unrealized losses | $ (62) | $ (12)
Municipal Obligations, Taxable [Member] |  |
Investment Holdings [Line Items] |  |
No. of securities | Integer | 13 |
Less than 12 months, Fair value | $ 8,802 |
Less than 12 months, Unrealized losses | (136) |
12 months or longer, Fair value |  |
12 months or longer, Unrealized losses |  |
Total, Fair value | 8,802 |
Total, Unrealized losses | $ (136) |
Agency Mortgage-backed Securities [Member] |  |
Investment Holdings [Line Items] |  |
No. of securities | Integer | 28 |
Less than 12 months, Fair value | $ 95,028 |
Less than 12 months, Unrealized losses | (1,269) |
12 months or longer, Fair value |  |
12 months or longer, Unrealized losses |  |
Total, Fair value | 95,028 |
Total, Unrealized losses | $ (1,269) |

X
- Definition Available for sale of securities continuous unrealized loss position fair value. + References No definition available. + Details
Name: | LARK_AvailableForSaleOfSecuritiesContinuousUnrealizedLossPositionFairValue
Namespace Prefix: | LARK_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- References No definition available. + Details
Name: | LARK_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLongerFairValue
Namespace Prefix: | LARK_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Less than twelve months, Fair value + References No definition available. + Details
Name: | LARK_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12MonthsFairValue
Namespace Prefix: | LARK_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for more than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPosition12MonthsOrLonger
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in continuous unrealized loss position for less than 12 months, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27337-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922890-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleContinuousUnrealizedLossPositionLessThan12Months
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Amount of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position without allowance for credit loss. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 Reference 3: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 55 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=121590138&loc=SL82922954-210456 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPosition
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant

X
- Definition Number of investments in debt securities measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), in unrealized loss position, without allowance for credit loss. Includes beneficial interest in securitized financial asset. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=123581744&loc=d3e27290-111563 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 326 -SubTopic 30 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=124269663&loc=SL82922888-210455 + Details
Name: | us-gaap_DebtSecuritiesAvailableForSaleUnrealizedLossPositionNumberOfPositions
Namespace Prefix: | us-gaap_
Data Type: | xbrli:integerItemType
Balance Type: | na
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_InvestmentHoldingsLineItems
Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

X
- Details
Name: | us-gaap_InvestmentTypeAxis=us-gaap_USTreasurySecuritiesMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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

X
- Details
Name: | us-gaap_InvestmentTypeAxis=LARK_MunicipalObligationsTaxExemptMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

X
- Details
Name: | us-gaap_InvestmentTypeAxis=LARK_MunicipalObligationsTaxableMember
Namespace Prefix: |
Data Type: | na
Balance Type: |
Period Type: |

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