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Repurchase Agreements (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2015 | Dec. 31, 2014
Other Borrowings Disclosure [Line Items] |  |
Average daily balance during the year | $ 11,952 | $ 13,497
Average interest rate during the year | 0.14% | 0.13%
Maximum month-end balance during the year | $ 14,744 | $ 15,128
Weighted average interest rate at year-end | 0.13% | 0.14%

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- Definition Amount represents average daily securities payable under securities issued repurchase agreement during the year. + References No definition available. + Details
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Balance Type: | credit
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- 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_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- References No definition available. + Details
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Namespace Prefix: | lark_
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Balance Type: | na
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- Definition The average effective interest rate during the reporting period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6451184&loc=d3e28551-108399 Reference 2: http://www.xbrl.org/2003/role/presentationRef -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
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- Definition Weighted average interest rate of debt outstanding. + References No definition available. + Details
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Balance Type: | na
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