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Share-Based Compensation - Summary of the Status of Restricted Shares (Details) (Restricted stock [Member], USD $)
3 Months Ended
Mar. 31, 2015
Restricted stock [Member]
 
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number of Shares [Roll Forward]  
Nonvested Shares, beginning balance (in shares) 38,552us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Nonvested Shares, Granted (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Nonvested Shares, Vested (in shares) (28,552)us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Nonvested Shares, Forfeited or expired (in shares) 0us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeitedInPeriod
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Nonvested Shares, ending balance (in shares) 10,000us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedNumber
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Weighted Average Grant Date Fair Value [Roll Forward]  
Weighted Average Exercise Price per Share, Beginning balance (in dollars per share) $ 6.45lnbb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Weighted Average Exercise Price per Share, Granted (in dollars per share) $ 0.00lnbb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsGrantsInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Weighted Average Exercise Price per Share, Vested (in dollars per share) $ 5.28lnbb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsVestedInPeriodWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Weighted Average Exercise Price per Share, Forfeited or expired (in dollars per share) $ 0.00us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsForfeituresWeightedAverageGrantDateFairValue
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember
Weighted Average Exercise Price per Share, Ending balance (in dollars per share) $ 9.48lnbb_ShareBasedCompensationArrangementByShareBasedPaymentAwardEquityInstrumentsOtherThanOptionsNonvestedWeightedAverageExercisePrice
/ us-gaap_AwardTypeAxis
= us-gaap_RestrictedStockMember