2.4.0.82401402 - Disclosure - Summary of Significant Accounting Policies - Additional Information (Details)truefalsefalse1false falsefalseD2012Q4YTDhttp://www.sec.gov/CIK0000737210duration2012-01-01T00:00:002012-12-31T00:00:002false truefalseD2013Q2YTD_us-gaap_RangeAxis_us-gaap_MaximumMemberhttp://www.sec.gov/CIK0000737210duration2013-01-01T00:00:002013-06-30T00:00:00falsefalseMaximum [Member]us-gaap_RangeAxisxbrldihttp://xbrl.org/2006/xbrldius-gaap_MaximumMemberus-gaap_RangeAxisexplicitMember1true 3us-gaap_AccountsNotesAndLoansReceivableLineItemsus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:stringItemTypestringfalse0Accounts, Notes, Loans and Financing Receivable [Line Items]2false 4lnbb_WrittenLoanCommitmentPeriodlnbb_falsenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse00falsefalsefalse2falsefalsefalse0060 daysfalsefalsefalsexbrli:durationItemTypenaWritten Loan Commitment PeriodNo definition available.false0Written loan commitment period before closing3false 2us-gaap_FiniteLivedIntangibleAssetWeightedAveragePeriodBeforeNextRenewalOrExtensionus-gaap_truenadurationfalsefalsefalsefalsefalsefalsefalsefalseterseLabel1falsefalsefalse0010 yearsfalsefalsefalse2falsefalsefalse00falsefalsefalsexbrli:durationItemTypenaWeighted average period before the next renewal or extension (both explicit and implicit) for intangible assets that have been renewed or extended, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 350 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=7658586&loc=d3e16323-109275 false0Amortization of intangible assetsfalseSummary of Significant Accounting Policies - Additional Information (Details)UnKnownUnKnownUnKnownUnKnowntruefalsefalseSheethttp://www.4lnb.com/role/SummaryOfSignificantAccountingPoliciesAdditionalInformationDetails23