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Loans and Allowance for Loan Losses - Troubled Debt Restructuring Loan Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
contracts
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Number of Contracts 2us-gaap_FinancingReceivableModificationsNumberOfContracts2
Recorded Investment $ 628lnbb_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
Unpaid Principal 628lnbb_FinancingReceivableUnpaidPrincipal
Commercial real estate  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Number of Contracts 2us-gaap_FinancingReceivableModificationsNumberOfContracts2
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
Recorded Investment 628lnbb_FinancingReceivableModificationsRecordedInvestmentDuringPeriod
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember
Unpaid Principal $ 628lnbb_FinancingReceivableUnpaidPrincipal
/ us-gaap_FinancialInstrumentAxis
= us-gaap_CommercialRealEstateMember