XML 102 R78.htm IDEA: XBRL DOCUMENT v3.20.1

Repurchase Agreements - Schedule of Repurchase Agreements (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018
Assets Sold under Agreements to Repurchase [Line Items]
Average daily balance during the year	$ 15,695	$ 12,388
Average interest rate during the year	0.62%	0.87%
Maximum month-end balance during the year	$ 17,548	$ 15,246
Weighted average interest rate at year-end	0.47%	1.00%
Assets sold under agreements to repurchase, carrying amount	$ 17,548	$ 15,246
US Federal Treasury Obligations [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase, carrying amount	789	416
U.S. Federal Agency Obligations [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase, carrying amount	1,978	5,626
Agency Mortgage-backed Securities [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase, carrying amount	14,781	9,204
Overnight and Continuous [Member]
Assets Sold under Agreements to Repurchase [Line Items]
Assets sold under agreements to repurchase, carrying amount	17,548	15,246
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	416
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	1,978	5,626
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	14,781	9,204
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] | US Federal Treasury Obligations [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
30 - 90 Days [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
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
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] | 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] | 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

X

- Definition

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

+ References

No definition available.

+ Details

Name:	LARK_DebtInstrumentAverageDailyBalance
Namespace Prefix:	LARK_
Data Type:	xbrli:monetaryItemType
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

Name:	LARK_DebtInstrumentMaximumMonthEndBalance
Namespace Prefix:	LARK_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	duration

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=26873400&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

- Definition

The average effective interest rate during the reporting period.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=114775744&loc=d3e28551-108399

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02.22(a)(1))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

+ Details

Name:	us-gaap_DebtInstrumentInterestRateDuringPeriod
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	duration

X

- Definition

Weighted average interest rate of debt outstanding.

+ References

No definition available.

+ Details

Name:	us-gaap_DebtWeightedAverageInterestRate
Namespace Prefix:	us-gaap_
Data Type:	num:percentItemType
Balance Type:	na
Period Type:	instant

X

- Details

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

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_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: