XML 32 R30.htm IDEA: XBRL DOCUMENT v3.20.1

Investments - Schedule of Available-for-sale Securities (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Debt Securities, Available-for-sale [Line Items]
Amortized cost	$ 304,915	$ 356,059
Gross unrealized gains	9,707	7,266
Gross unrealized losses	(133)	(327)
Estimated fair value	314,489	362,998
U.S. Treasury Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,000	2,300
Gross unrealized gains	57	16
Gross unrealized losses
Estimated fair value	2,057	2,316
U.S. Federal Agency Obligations [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	2,015	4,015
Gross unrealized gains	148	91
Gross unrealized losses
Estimated fair value	2,163	4,106
Municipal Obligations, Tax Exempt [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	138,118	142,391
Gross unrealized gains	3,626	3,513
Gross unrealized losses	(61)	(42)
Estimated fair value	141,683	145,862
Municipal Obligations, Taxable [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	48,307	45,541
Gross unrealized gains	1,822	1,293
Gross unrealized losses	(72)	(55)
Estimated fair value	50,057	46,779
Agency Mortgage-backed Securities [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	112,570	159,908
Gross unrealized gains	4,054	2,353
Gross unrealized losses		(230)
Estimated fair value	116,624	162,031
Certificates of Deposit [Member]
Debt Securities, Available-for-sale [Line Items]
Amortized cost	1,905	1,904
Gross unrealized gains
Gross unrealized losses
Estimated fair value	$ 1,905	$ 1,904

X

- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecurities
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

Amount before tax of unrealized gain in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 320
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=121645371&loc=d3e27161-111563

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedGainBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant

X

- Definition

Amount before tax of unrealized loss in accumulated other comprehensive income (AOCI) on investments in debt and equity securities classified as available-for-sale.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesAccumulatedGrossUnrealizedLossBeforeTax
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

X

- Definition

This item represents the cost of debt and equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any.

+ References

No definition available.

+ Details

Name:	us-gaap_AvailableForSaleSecuritiesAmortizedCost
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
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_ScheduleOfAvailableForSaleSecuritiesLineItems
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:

X

- Details

Name:	us-gaap_InvestmentTypeAxis=us-gaap_CertificatesOfDepositMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: