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Schedule of Repurchase Agreements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Average daily balance during the year	$ 18,361	$ 13,239
Average interest rate during the year	2.72%	1.11%
Maximum month-end balance during the year	$ 20,083	$ 33,930
Weighted average interest rate at year-end	2.84%	1.70%
Total	$ 12,714	$ 29,402
US Federal Treasury Obligations [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total	12,714	25,973
US Federal Agency Obligations [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total		1,236
Agency Mortgage Backed [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total		2,193
Overnight And Continuous [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total	12,714	29,402
Overnight And Continuous [Member] | US Federal Treasury Obligations [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total	12,714	25,973
Overnight And Continuous [Member] | US Federal Agency Obligations [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total		1,236
Overnight And Continuous [Member] | Agency Mortgage Backed [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total		2,193
Upto 30 Days [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total
Upto 30 Days [Member] | US Federal Treasury Obligations [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total
Upto 30 Days [Member] | US Federal Agency Obligations [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total
Upto 30 Days [Member] | Agency Mortgage Backed [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total
30 - 90 Days [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total
30 - 90 Days [Member] | US Federal Treasury Obligations [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total
30 - 90 Days [Member] | US Federal Agency Obligations [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total
30 - 90 Days [Member] | Agency Mortgage Backed [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total
Greater Than 90 Days [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total
Greater Than 90 Days [Member] | US Federal Treasury Obligations [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total
Greater Than 90 Days [Member] | US Federal Agency Obligations [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total
Greater Than 90 Days [Member] | Agency Mortgage Backed [Member]
Transfer of Certain Financial Assets Accounted for as Secured Borrowings [Line Items]
Total

X

- Definition

Amount represents average daily securities payable under securities issued repurchase agreement during the year.

+ References

No definition available.

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Balance Type:	credit
Period Type:	duration

X

- Definition

Amount represents maximum month end balance under securities issued repurchase agreement during the year.

+ References

No definition available.

+ Details

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Namespace Prefix:	LARK_
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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://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(m)(1)(i))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 235
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08(m)(1)(ii)(A)(i))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480678/235-10-S99-1

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X

- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 470
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 1F
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481139/470-20-50-1F

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482925/835-30-45-2

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

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Balance Type:	na
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- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

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Namespace Prefix:	us-gaap_
Data Type:	dtr-types:percentItemType
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- 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

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 860
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481420/860-30-50-7

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 860
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 7
-Subparagraph (b)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147481420/860-30-50-7

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