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v3.3.1.900

Loan Commitments (Details Textual) - USD ($) | Dec. 31, 2015 | Dec. 31, 2014
--- | --- | ---
Letters of Credit Outstanding, Amount | $ 70,000,000 | $ 60,600,000
Stand By Letters Of Credit | $ 1,900,000 | $ 965,000

X
- Definition The total amount of the contingent obligation under standby letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | lark_StandByLettersOfCredit
Namespace Prefix: | lark_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition The total amount of the contingent obligation under letters of credit outstanding as of the reporting date. + References No definition available. + Details
Name: | us-gaap_LettersOfCreditOutstandingAmount
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant