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Loans and Allowance for Loan Losses - Additional Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2015
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Threshold Period Past Due for Write-off of Financing Receivable 90 days
Historical loss measurement period 3 years
Allocated reserves of nonaccrual TDR loans $ 9lnbb_AllocatedReservesOfNonaccrualTroubledDebtRestructuringLoans
Additional commitments to lend $ 632us-gaap_LoansAndLeasesReceivableImpairedCommitmentToLend
Minimum [Member]  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Time period of repayment based on delinquency period one 30 days
Time period of repayment based on delinquency period two 60 days
Time period of repayment based on delinquency period three 90 days
Maximum [Member]  
Accounts, Notes, Loans and Financing Receivable [Line Items]  
Time period of repayment based on delinquency period one 59 days
Time period of repayment based on delinquency period two 89 days