Short-Term Borrowings - Additional Information (Details) (USD $)	3 Months Ended
Mar. 31, 2015	Dec. 31, 2014
Short-term Debt [Line Items]
Line of credit	50.00%lnbb_PercentageOfHomeEquityLineOfCredit
Home equity lines of credit	$ 94,871,000lnbb_HomeEquityLinesOfCredit
Available line of credit	47,436,000
Line of credit outstanding	0us-gaap_LineOfCredit	0us-gaap_LineOfCredit
Line of credit, capacity drawn	72,774,000
Federal Funds Purchased		10,000,000us-gaap_FederalFundsPurchased
Securities sold under repurchase agreements	637,000	611,000
Unaffiliated Financial Institution
Short-term Debt [Line Items]
Line of credit outstanding	0
Line of credit, capacity drawn	$ 6,000,000

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Amount, after the effects of master netting arrangements, of funds outstanding borrowed in the form of a security repurchase agreement between the entity and another party for the sale and repurchase of identical or substantially the same securities at a date certain for a specified price. Includes liabilities not subject to a master netting arrangement and not elected to be offset.

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