ACNB (ACNB) 10-K 7 Mar 14 2013 FY Annual report Financial data

Document_and_Entity_Informatio

Document and Entity Information (USD $)	12 Months Ended
	Dec. 31, 2013	Mar. 07, 2014	Jun. 30, 2013
Document and Entity Information [Abstract]	'	'	'
Document Type	'10-K	'	'
Amendment Flag	'false	'	'
Document Period End Date	31-Dec-13	'	'
Entity Registrant Name	'ACNB CORP	'	'
Entity Central Index Key	'0000715579	'	'
Current Fiscal Year End Date	'--12-31	'	'
Entity Filer Category	'Accelerated Filer	'	'
Entity Common Stock, Shares Outstanding	'	5,991,311	'
Document Fiscal Year Focus	'2013	'	'
Document Fiscal Period Focus	'FY	'	'
Entity Well-known Seasoned Issuer	'No	'	'
Entity Current Reporting Status	'Yes	'	'
Entity Public Float	'	'	$97,774,246
Entity Voluntary Filers	'No	'	'

Consolidated_Statements_of_Con

Consolidated Statements of Condition (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
ASSETS	'	'
Cash and due from banks	$13,963	$19,078
Interest bearing deposits with banks	4,153	32,307
Total Cash and Cash Equivalents	18,116	51,385
Securities available for sale	129,983	165,790
Securities held to maturity, fair value $92,082; $50,980	94,373	50,159
Loans held for sale	496	6,687
Loans, net of allowance for loan losses $16,091; $16,825	712,557	691,311
Premises and equipment	15,991	15,131
Restricted investment in bank stocks	6,861	5,318
Investment in bank-owned life insurance	32,237	31,122
Investments in low-income housing partnerships	4,687	5,440
Goodwill	6,308	6,308
Intangible assets	1,845	2,409
Foreclosed assets held for resale	1,762	4,247
Other assets	20,831	14,688
Total Assets	1,046,047	1,049,995
LIABILITIES	'	'
Deposits: Non-interest bearing	128,011	119,297
Deposits: Interest bearing	672,632	714,879
Total Deposits	800,643	834,176
Short-term borrowings	49,052	47,303
Long-term borrowings	82,703	59,954
Other liabilities	6,847	7,298
Total Liabilities	939,245	948,731
STOCKHOLDERS' EQUITY	'	'
Preferred stock, $2.50 par value; 20,000,000 shares authorized; no shares outstanding	0	0
Common stock, $2.50 par value; 20,000,000 shares authorized; 6,053,911 and 6,027,968 shares issued; 5,991,311 and 5,965,368 shares outstanding	15,135	15,070
Treasury stock, at cost (62,600 shares)	-728	-728
Additional paid-in capital	9,628	9,246
Retained earnings	82,661	77,888
Accumulated other comprehensive income (loss)	106	-212
Total Stockholders’ Equity	106,802	101,264
Total Liabilities and Stockholders’ Equity	$1,046,047	$1,049,995

Consolidated_Statements_of_Con1

Consolidated Statements of Condition (Parenthetical) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, except Share data, unless otherwise specified
Statement of Financial Position [Abstract]	'	'
Securities held to maturity, fair value	$92,082	$50,980
Loans, net allowance for loan losses	$16,091	$16,825
Preferred stock, par value	$2.50	$2.50
Preferred stock, shares authorized	20,000,000	20,000,000
Preferred stock, shares outstanding	0	0
Common stock, par value	$2.50	$2.50
Common stock, shares authorized	20,000,000	20,000,000
Common stock, shares issued	6,053,911	6,027,968
Common stock, shares outstanding	5,991,311	5,965,368
Treasury stock, shares	62,600	62,600

Consolidated_Statements_of_Inc

Consolidated Statements of Income (USD $)	12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
INTEREST INCOME	'	'	'
Loans, including fees	$32,084	$33,990	$34,493
Securities:	'	'	'
Taxable	4,230	4,876	6,006
Tax-exempt	1,197	1,457	1,252
Dividends	22	27	13
Other	68	89	68
Total Interest Income	37,601	40,439	41,832
INTEREST EXPENSE	'	'	'
Deposits	2,177	3,441	4,457
Short-term borrowings	61	76	91
Long-term borrowings	1,751	2,578	2,914
Total Interest Expense	3,989	6,095	7,462
Net Interest Income	33,612	34,344	34,370
PROVISION FOR LOAN LOSSES	1,450	4,675	5,435
Net Interest Income after Provision for Loan Losses	32,162	29,669	28,935
OTHER INCOME	'	'	'
Service charges on deposit accounts	2,246	2,433	2,418
Income from fiduciary activities	1,299	1,224	1,396
Earnings on investment in bank-owned life insurance	975	981	968
Gain on life insurance proceeds	0	63	0
Gains on sales or calls of securities	0	7	1
Service charges on ATM and debit card transactions	1,434	1,291	1,236
Commissions from insurance sales	4,671	4,835	4,824
Other	1,078	1,033	894
Total Other Income	11,703	11,867	11,737
OTHER EXPENSES	'	'	'
Salaries and employee benefits	18,950	18,553	17,138
Net occupancy	1,957	1,952	2,043
Equipment	2,826	2,537	2,620
Professional services	895	825	911
Other tax	901	833	803
Supplies and postage	583	634	640
Marketing and corporate relations	396	372	478
FDIC and regulatory	768	843	1,026
Intangible assets amortization	641	641	641
Foreclosed real estate expenses (income)	576	-119	725
Other operating	3,522	3,260	2,991
Total Other Expenses	32,015	30,331	30,016
Income Before Income Taxes	11,850	11,205	10,656
PROVISION FOR INCOME TAXES	2,535	2,319	2,154
Net Income	$9,315	$8,886	$8,502
PER SHARE DATA	'	'	'
Basic earnings	$1.56	$1.49	$1.43
Cash dividends declared	$0.76	$0.76	$0.76

Consolidated_Statements_of_Com

Consolidated Statements of Comprehensive Income (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Statement of Comprehensive Income [Abstract]	'		'		'
NET INCOME	$9,315		$8,886		$8,502
OTHER COMPREHENSIVE (LOSS) INCOME	'		'		'
SECURITIES: Unrealized (losses) gains arising during the period, net of income taxes of $(1,567), $(197), and $1,067, respectively	-3,042		-377		2,074
SECURITIES: Reclassification adjustment for net gains included in net income, net of income taxes of $0, $(2), and $0, respectively	0	[1],[2]	-5	[1],[2]	-1	[1],[2]
PENSION: Amortization of pension net loss, transition liability, and prior service cost, net of income taxes of $236, $226, and $66, respectively	456	[1],[3]	435	[1],[3]	126	[1],[3]
PENSION: Unrecognized net gain (loss), net of income taxes of $1,496, $(473), and $(1,404), respectively	2,904		-920		-2,726
TOTAL OTHER COMPREHENSIVE INCOME (LOSS)	318		-867		-527
TOTAL COMPREHENSIVE INCOME	$9,633		$8,019		$7,975
[1]	Income tax amounts are included in the provision for income taxes on the Consolidated Statements of Income.
[2]	Gross amounts are included in net gains on sales or calls of securities on the Consolidated Statements of Income in total other income.
[3]	Gross amounts are included in the computation of net periodic benefit cost and are included in salaries and employee benefits on the Consolidated Statements of Income in total other expenses.

Consolidated_Statements_of_Com1

Consolidated Statements of Comprehensive Income (Parenthetical) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Comprehensive Income [Abstract]	'	'	'
SECURITIES: Unrealized losses arising during the period, income taxes	($1,567)	($197)	$1,067
SECURITIES: Reclassification adjustment for net gains included in net income, income taxes	0	-2	0
PENSION: Amortization of pension net loss, transition liability, and prior service cost, income taxes	236	226	66
PENSION: Unrecognized net gain (loss), income taxes	$1,496	($473)	($1,404)

Consolidated_Statements_of_Cha

Consolidated Statements of Changes in Stockholders' Equity (USD $)	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income [Member]
In Thousands, unless otherwise specified
Beginning Balance at Dec. 31, 2010	$93,754	$14,977	($728)	$8,787	$69,536	$1,182
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'
Net income	8,502	'	'	'	8,502	'
Other comprehensive income, net of taxes	-527	'	'	'	'	-527
Common stock shares issued	257	44	'	213	'	'
Cash dividends declared	-4,512	'	'	'	-4,512	'
Ending Balance at Dec. 31, 2011	97,474	15,021	-728	9,000	73,526	655
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'
Net income	8,886	'	'	'	8,886	'
Other comprehensive income, net of taxes	-867	'	'	'	'	-867
Common stock shares issued	295	49	'	246	'	'
Cash dividends declared	-4,524	'	'	'	-4,524	'
Ending Balance at Dec. 31, 2012	101,264	15,070	-728	9,246	77,888	-212
Increase (Decrease) in Stockholders' Equity [Roll Forward]	'	'	'	'	'	'
Net income	9,315	'	'	'	9,315	'
Other comprehensive income, net of taxes	318	'	'	'	'	318
Common stock shares issued	447	65	'	382	'	'
Cash dividends declared	-4,542	'	'	'	-4,542	'
Ending Balance at Dec. 31, 2013	$106,802	$15,135	($728)	$9,628	$82,661	$106

Consolidated_Statements_of_Cha1

Consolidated Statements of Changes in Stockholders' Equity (Parenthetical)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Statement of Stockholders' Equity [Abstract]	'	'	'
Common stock issued, Shares	25,943	19,559	17,466

Consolidated_Statement_of_Cash

Consolidated Statement of Cash Flows (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
CASH FLOWS FROM OPERATING ACTIVITIES	'	'	'
Net income	$9,315	$8,886	$8,502
Adjustments to reconcile net income to net cash provided by operating activities:	'	'	'
Gain on sales of loans	-430	-296	-258
Loss (gain) on sales of foreclosed assets held for resale, including writedowns	181	-400	296
Earnings on investment in bank-owned life insurance	-975	-981	-968
Gain on sales or calls of securities	0	-7	-1
Gain on life insurance proceeds	0	-63	0
Depreciation and amortization	1,993	2,041	2,218
Provision for loan losses	1,450	4,675	5,435
Net amortization of investment securities premiums	972	893	682
Decrease (increase) in accrued interest receivable	333	329	-257
Decrease in accrued interest payable	-433	-315	-238
Mortgage loans originated for sale	-19,841	-32,316	-15,414
Proceeds from sales of loans originated for sale	26,462	26,262	18,403
(Increase) decrease in other assets	-750	1,880	3,857
Decrease in other liabilities	-291	-1,285	-4,103
Net Cash Provided by Operating Activities	17,986	9,303	18,154
CASH FLOWS FROM INVESTING ACTIVITIES	'	'	'
Proceeds from maturities of investment securities held to maturity	8,970	2,399	0
Proceeds from maturities of investment securities available for sale	37,606	62,589	55,804
Purchase of investment securities available for sale	-6,875	-19,676	-71,830
Purchase of investments held to maturity	-53,689	-42,705	0
(Purchase) redemption of restricted investment in bank stocks	-1,543	1,828	1,274
Net increase in loans	-23,823	-19,521	-37,672
Investment in low-income housing partnerships	-249	-2,106	0
Proceeds from sale of low-income housing partnerships	476	0	0
Purchase of bank-owned life insurance	-140	-1,940	0
Purchase of book of business	-77	0	0
Insurance agency acquisitions, net of cash acquired	0	0	-336
Proceeds from life insurance death benefits	0	273	0
Capital expenditures	-2,212	-2,049	-1,942
Proceeds from sale of foreclosed real estate	3,431	3,111	6,416
Net Cash Used in Investing Activities	-38,125	-17,797	-48,286
CASH FLOWS FROM FINANCING ACTIVITIES	'	'	'
Net increase in demand deposits	8,714	7,050	8,783
Net (decrease) increase in time certificates of deposits and interest bearing deposits	-42,247	44,331	27,486
Net increase in short-term borrowings	1,749	1,341	6,876
Proceeds from long-term borrowings	37,000	10,000	0
Repayments on long-term borrowings	-14,251	-21,237	-10,308
Dividends paid	-4,542	-4,524	-4,512
Common stock issued	447	295	257
Net Cash (Used in) Provided by Financing Activities	-13,130	37,256	28,582
Net (Decrease) Increase in Cash and Cash Equivalents	-33,269	28,762	-1,550
CASH AND CASH EQUIVALENTS — BEGINNING	51,385	22,623	24,173
CASH AND CASH EQUIVALENTS — ENDING	18,116	51,385	22,623
Interest paid	4,422	6,410	7,700
Income taxes paid	2,925	725	1,700
Loans transferred to foreclosed assets held for resale	$1,127	$2,521	$3,290

Summary_of_Significant_Account

Summary of Significant Accounting Policies	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES	'
	SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES
	Nature of Operations
	ACNB Corporation (the Corporation or ACNB), headquartered in Gettysburg, Pennsylvania, provides banking, insurance, and financial services to businesses and consumers through its wholly-owned subsidiaries, ACNB Bank (Bank) and Russell Insurance Group, Inc. (RIG). The Bank engages in full-service commercial and consumer banking and trust services through its nineteen retail banking locations in Adams, Cumberland and York Counties, Pennsylvania. There is also a loan production office situated in Franklin County, Pennsylvania.
	RIG is a full-service insurance agency, based in Westminster, Maryland. The agency offers a broad range of property and casualty, life, and health insurance to both commercial and individual clients. In 2008, due to an agency acquisition, a second location of RIG was established in Germantown, Maryland.
	The Corporation, along with seven other banks, entered into a joint venture to form BankersRe Insurance Group, SPC (formerly Pennbanks Insurance Co., SPC), an offshore reinsurance company. Each participating entity owned an insurance cell through which its premiums and losses from credit life, disability and accident insurance are funded. Each entity was responsible for the activity in its respective cell. The financial activity for the Corporation’s insurance cell is included in the consolidated financial statements and is not material to the consolidated financial statements. The segregated portfolio was novated to a third party during 2012.
	The Corporation’s primary source of revenue is interest income on loans and investment securities and fee income on its products and services. Expenses consist of interest expense on deposits and borrowed funds, provisions for loan losses, and other operating expenses.
	Basis of Financial Statements
	The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) and include the accounts of the Corporation and its wholly-owned subsidiaries. All significant intercompany transactions have been eliminated.
	Assets held by the Corporation’s Trust Department in an agency or fiduciary capacity for its customers are excluded from the consolidated financial statements since they do not constitute assets of the Corporation. Assets held by the Trust Department amounted to $151,000,000 and $141,000,000 at December 31, 2013 and 2012, respectively. Income from fiduciary activities is recognized on the cash method, which approximates the accrual method.
	Certain amounts previously reported have been reclassified, when necessary, to conform to the financial statement presentation for 2013. The reclassifications had no effect on net income or stockholders’ equity.
	The Corporation has evaluated events and transactions occurring subsequent to the balance sheet date of December 31, 2013, for items that should potentially be recognized or disclosed in the consolidated financial statements. The evaluation was conducted through the date these consolidated financial statements were issued.
	Use of Estimates
	Financial statements prepared in accordance with GAAP require management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingencies at the date of the consolidated financial statements, and revenues and expenses during the reporting period. Actual results could differ from these estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for loan losses, the valuation of deferred tax assets, the determination of other than temporary impairment on securities, and the potential impairment of goodwill.
	Significant Group Concentrations of Credit Risk
	Most of the Corporation’s activities are with customers located within southcentral Pennsylvania and northern Maryland. Note C discusses the types of securities in which the Corporation invests. Note D discusses the types of lending in which the Corporation engages. Included in commercial real estate loans are loans made to lessors of non-residential dwellings that total $104,752,000, or 14.4%, of total loans at December 31, 2013. These borrowers are geographically disbursed throughout ACNB’s marketplace and are leasing commercial properties to a varied group of tenants including medical offices, retail space and recreational facilities. Because of the varied nature of the tenants in aggregate, management believes that these loans do not present any greater risk than commercial loans in general.
	Cash and Cash Equivalents
	For purposes of the consolidated statements of cash flows, cash and cash equivalents include cash on hand, balances due from banks, and federal funds sold, all of which mature within 90 days.
	Securities
	Debt securities that management has the positive intent and ability to hold to maturity are classified as “held to maturity” and recorded at amortized cost. Securities not classified as held to maturity or trading, including equity securities with readily determinable fair values, are classified as “available for sale” and recorded at fair value, with unrealized gains and losses excluded from earnings and reported, net of tax, in other comprehensive income (loss).
	Purchase premiums and discounts are recognized in interest income using the interest method over the terms of the securities. Declines in the fair value of held to maturity and available for sale securities below their cost that are deemed to be other than temporary are reflected in earnings as realized losses. In estimating other-than-temporary impairment losses on debt securities, management considers (1) whether management intends to sell the security, or (2) if it is more likely than not that management will be required to sell the security before recovery, or (3) if management does not expect to recover the entire amortized cost basis. In assessing potential other-than-temporary impairment for equity securities, consideration is given to management’s intention and ability to hold the securities until recovery of unrealized losses. Gains and losses on the sale of securities are recorded on the trade date and are determined using the specific identification method.
	Restricted Investment in Bank Stocks
	Restricted investment in bank stocks, which represents required investments in the common stock of correspondent banks, is carried at cost as of December 31, 2013 and 2012, and consists of common stock in the Atlantic Central Bankers Bank and Federal Home Loan Bank (FHLB).
	Management evaluates the restricted investment in bank stocks for impairment in accordance with Accounting Standard Codification (ASC) Topic 942, Financial Services—Depository and Lending. Management’s determination of whether these investments are impaired is based on their assessment of the ultimate recoverability of their cost rather than by recognizing temporary declines in value. The determination of whether a decline affects the ultimate recoverability of their cost is influenced by criteria such as (1) the significance of the decline in net assets of the correspondent bank as compared to the capital stock amount for the correspondent bank and the length of time this situation has persisted, (2) commitments by the correspondent bank to make payments required by law or regulation and the level of such payments in relation to the operating performance of the correspondent bank, (3) the impact of legislative and regulatory changes on institutions and, accordingly, on the customer base of the correspondent bank, and (4) the liquidity position of the correspondent bank.
	Management believes no impairment charge was necessary related to the restricted investment in bank stocks during 2013, 2012 or 2011. However, security impairment analysis is completed quarterly, and the determination that no impairment has occurred during those years is no assurance that impairment may not occur in future periods.
	Loans Held for Sale
	Loans originated and intended for sale in the secondary market are carried at the lower of aggregate cost or fair value, as determined by aggregate outstanding commitments from investors or current investor yield requirements. Net unrealized losses are recognized through a valuation allowance by charges to income.
	Mortgage loans held for sale are sold with the mortgage servicing rights released to another financial institution through a correspondent relationship. The correspondent financial institution absorbs all of the risk related to rate lock commitments. Gains or losses on sales of mortgage loans are recognized based on the difference between the selling price and the carrying value of the related mortgage loans sold.
	Loans
	The Corporation grants commercial, residential, and consumer loans to customers. A substantial portion of the loan portfolio is represented by mortgage loans throughout southcentral Pennsylvania and northern Maryland. The ability of the Corporation’s debtors to honor their contracts is dependent upon the real estate and general economic conditions in this area.
	Loans that management has the intent and ability to hold for the foreseeable future or until maturity or pay-off generally are reported at their outstanding unpaid principal balances adjusted for charge-offs, the allowance for loan losses, and any deferred fees or costs on originated loans. Interest income is accrued on the unpaid principal balance. Loan origination fees, net of certain direct origination costs, are deferred and recognized as an adjustment of the related loan yield using the interest method.
	The loans receivable portfolio is segmented into commercial, residential mortgage, home equity lines of credit, and consumer loans. Commercial loans consist of the following classes: commercial and industrial, commercial real estate, and commercial real estate construction.
	The accrual of interest on residential mortgage and commercial loans is discontinued at the time the loan is 90 days past due unless the credit is well-secured and in process of collection. Consumer loans (consisting of home equity lines of credit and consumer loan classes) are typically charged off no later than 120 days past due. Past due status is based on contractual terms of the loan. In all cases, loans are placed on nonaccrual or charged off at an earlier date if collection of principal or interest is considered doubtful.
	All interest accrued, but not collected, for loans that are placed on nonaccrual or charged off is reversed against interest income. The interest on these loans is accounted for on the cash-basis or cost-recovery method, until qualifying for return to accrual status. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured.
	Allowance for Credit Losses
	The allowance for credit losses consists of the allowance for loan losses and the reserve for unfunded lending commitments. The allowance for loan losses (the “allowance”) is established as losses and are estimated to occur through a provision for loan losses charged to earnings. Loan losses are charged against the allowance when management believes the uncollectibility of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance. The reserve for unfunded lending commitments represents management’s estimate of losses inherent in its unfunded loan commitments and is recorded in other liabilities on the consolidated statement of condition. The amount of the reserve for unfunded lending commitments is not material to the consolidated statements.
	The allowance for loan losses is evaluated on a regular basis by management and is based upon management’s periodic review of the collectibility of the loans in light of historical experience, the nature and volume of the loan portfolio, adverse situations that may affect the borrower’s ability to repay, estimated value of any underlying collateral, and prevailing economic conditions. This evaluation is inherently subjective as it requires estimates that are susceptible to significant revision as more information becomes available.
	The allowance consists of specific, general and unallocated components. The specific component relates to loans that are classified as either doubtful, substandard or special mention. For such loans that are also classified as impaired, an allowance is established when the discounted cash flows (or collateral value or observable market price) of the impaired loan is lower than the carrying value of that loan. The general component covers pools of loans by loan class including commercial loans not considered impaired, as well as smaller balance homogeneous loans, such as residential real estate, home equity, and other consumer loans. These pools of loans are evaluated for loss exposure based upon historical loss rates for each of these categories of loans, adjusted for qualitative factors. These qualitative risk factors include:
	•	lending policies and procedures, including underwriting standards and collection, charge-off and recovery practices;
	•	national, regional and local economic and business conditions, as well as the condition of various market segments, including the impact on the value of underlying collateral for collateral dependent loans;
	•	the nature and volume of the portfolio and terms of loans;
	•	the experience, ability and depth of lending management and staff;
	•	the volume and severity of past due, classified and nonaccrual loans, as well as other loan modifications; and,
	•	the existence and effect of any concentrations of credit and changes in the level of such concentrations.
	Each factor is assigned a value to reflect improving, stable or declining conditions based on management’s best judgment using relevant information available at the time of the evaluation. Adjustments to the factors are supported through documentation of changes in conditions in a narrative accompanying the allowance for loan loss calculation.
	The unallocated component of the allowance is maintained to cover uncertainties that could affect management’s estimate of probable losses. The unallocated component of the allowance reflects the margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating specific and general losses in the portfolio. It covers risks that are inherently difficult to quantify including, but not limited to, collateral risk, information risk, and historical charge-off risk.
	A loan is considered impaired when, based on current information and events, it is probable that the Corporation will be unable to collect the scheduled payments of principal and/or interest when due according to the contractual terms of the loan agreement. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and/or interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest owed. Impairment is measured on a loan by loan basis for commercial and commercial construction loans by either the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s obtainable market price, or the fair value of the collateral if the loan is collateral dependent.
	A specific allocation within the allowance for loan losses is established for an impaired loan if its carrying value exceeds its estimated fair value. The estimated fair values of the Corporation’s impaired loans are measured based on the estimated fair value of the loan’s collateral or the discounted cash flows method.
	It is the policy of the Corporation to order an updated valuation on all real estate secured loans when the loan becomes 90 days past due and there has not been an updated valuation completed within the previous 12 months. In addition, the Corporation orders third party valuations on all impaired real estate collateralized loans within 30 days of the loan being classified as impaired. Until the valuations are completed, the Corporation utilizes the most recent independent third party real estate valuation to estimate the need for a specific allocation to be assigned to the loan. These existing valuations are discounted downward to account for such things as the age of the existing collateral valuation, a change in the condition of the real estate, change in local market and economic conditions, and other specific factors involving the collateral. Once the updated valuation is completed, the collateral value is updated accordingly.
	For commercial and industrial loans secured by non-real estate collateral, such as accounts receivable, inventory and equipment, estimated fair values are determined based on the borrower’s financial statements, inventory reports, accounts receivable aging reports, equipment appraisals, or invoices. Indications of value from these sources are generally discounted based on the age of the financial information or the quality of the assets.
	The Corporation actively monitors the values of collateral as well as the age of the valuation of impaired loans. Management believes that the Corporation’s market area is not as volatile as other areas throughout the United States, therefore valuations are ordered at least every 18 months, or more frequently if management believes that there is an indication that the fair value has declined.
	For impaired loans secured by collateral other than real estate, the Corporation considers the net book value of the collateral, as recorded in the most recent financial statements of the borrower, and determines fair value based on estimates made by management.
	Large groups of smaller balance homogeneous loans are collectively evaluated for impairment. Accordingly, the Corporation does not separately identify individual consumer and residential loans for impairment disclosures, unless such loans are the subject of a troubled debt restructure.
	Loans whose terms are modified are classified as troubled debt restructured loans if the Corporation grants such borrowers concessions that it would not otherwise consider and it is deemed that those borrowers are experiencing financial difficulty. Concessions granted under a troubled debt restructuring generally involve a temporary reduction in interest rate, a below market interest rate given the risk associated with the loan, or an extension of a loan’s stated maturity date. Nonaccrual troubled debt restructurings may be restored to accrual status if principal and interest payments, under the modified terms, are current for a sustained period of time and, based on a well-documented credit evaluation of the borrower’s financial condition, there is reasonable assurance of repayment. Loans classified as troubled debt restructurings are generally designated as impaired.
	The allowance calculation methodology includes further segregation of loan classes into credit quality rating categories. The borrower’s overall financial condition, repayment sources, guarantors, and value of collateral, if appropriate, are generally evaluated annually for commercial loans or when credit deficiencies arise, such as delinquent loan payments.
	Credit quality risk ratings include regulatory classifications of special mention, substandard, doubtful and loss. Loans classified special mention have potential weaknesses that deserve management’s close attention. If uncorrected, the potential weaknesses may result in deterioration of the repayment prospects. Loans classified substandard have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They include loans that are inadequately protected by the current sound net worth and paying capacity of the obligor or of the collateral pledged, if any. Loans classified doubtful have all the weaknesses inherent in loans classified substandard with the added characteristic that collection or liquidation in full, on the basis of current conditions and facts, is highly improbable. Loans classified as a loss are considered uncollectible and are charged to the allowance for loan losses. Loans not classified are rated pass.
	In addition, federal and state regulatory agencies, as an integral part of their examination process, periodically review the Corporation’s allowance for loan losses and may require the Corporation to recognize additions to the allowance based on their judgments about information available to them at the time of their examination, which may not be currently available to management. Based on management’s comprehensive analysis of the loan portfolio and economic conditions, management believes the current level of the allowance for loan losses is adequate.
	Commercial and Industrial Lending — The Corporation originates commercial and industrial loans primarily to businesses located in its primary market area and surrounding areas. These loans are used for various business purposes which include short-term loans and lines of credit to finance machinery and equipment purchases, inventory, and accounts receivable. Generally, the maximum term for loans extended on machinery and equipment is based on the projected useful life of such machinery and equipment. Most business lines of credit are written on demand and may be renewed annually.
	Commercial and industrial loans are generally secured with short-term assets; however, in many cases, additional collateral such as real estate is provided as additional security for the loan. Loan-to-value maximum values have been established by the Corporation and are specific to the type of collateral. Collateral values may be determined using invoices, inventory reports, accounts receivable aging reports, collateral appraisals, etc.
	In underwriting commercial and industrial loans, an analysis is performed to evaluate the borrower’s character and capacity to repay the loan, the adequacy of the borrower’s capital and collateral, as well as the conditions affecting the borrower. Evaluation of the borrower’s past, present and future cash flows is also an important aspect of the Corporation’s analysis.
	Commercial loans generally present a higher level of risk than other types of loans due primarily to the effect of general economic conditions.
	Commercial Real Estate Lending — The Corporation engages in commercial real estate lending in its primary market area and surrounding areas. The Corporation’s commercial loan portfolio is secured primarily by commercial retail space, office buildings, and hotels. Generally, commercial real estate loans have terms that do not exceed 20 years, have loan-to-value ratios of up to 80% of the appraised value of the property, and are typically secured by personal guarantees of the borrowers.
	In underwriting these loans, the Corporation performs a thorough analysis of the financial condition of the borrower, the borrower’s credit history, and the reliability and predictability of the cash flow generated by the property securing the loan. Appraisals on properties securing commercial real estate loans originated by the Corporation are performed by independent appraisers.
	Commercial real estate loans generally present a higher level of risk than other types of loans due primarily to the effect of general economic conditions and the complexities involved in valuing the underlying collateral.
Commercial Real Estate Construction Lending — The Corporation engages in commercial real estate construction lending in its primary market area and surrounding areas. The Corporation’s commercial real estate construction lending consists of commercial and residential site development loans, as well as commercial building construction and residential housing construction loans.
The Corporation’s commercial real estate construction loans are generally secured with the subject property. Terms of construction loans depend on the specifics of the project, such as estimated absorption rates, estimated time to complete, etc.
In underwriting commercial real estate construction loans, the Corporation performs a thorough analysis of the financial condition of the borrower, the borrower’s credit history, and the reliability and predictability of the cash flow generated by the project using feasibility studies, market data, etc. Appraisals on properties securing commercial real estate construction loans originated by the Corporation are performed by independent appraisers.
Commercial real estate construction loans generally present a higher level of risk than other types of loans due primarily to the effect of general economic conditions and the uncertainties surrounding total construction costs.
Residential Mortgage Lending — One-to-four family residential mortgage loan originations, including home equity closed-end loans, are generated by the Corporation’s marketing efforts, its present customers, walk-in customers, and referrals. These loans originate primarily within the Corporation’s market area or with customers primarily from the market area.
The Corporation offers fixed-rate and adjustable-rate mortgage loans with terms up to a maximum of 30 years for both permanent structures and those under construction. The Corporation’s one-to-four family residential mortgage originations are secured primarily by properties located in its primary market area and surrounding areas. The majority of the Corporation’s residential mortgage loans originate with a loan-to-value of 80% or less. Loans in excess of 80% are required to have private mortgage insurance.
In underwriting one-to-four family residential real estate loans, the Corporation evaluates both the borrower’s ability to make monthly payments and the value of the property securing the loan. Properties securing real estate loans made by the Corporation are appraised by independent appraisers. The Corporation generally requires borrowers to obtain an attorney’s title opinion or title insurance, as well as fire and property insurance (including flood insurance, if necessary) in an amount not less than the amount of the loan. The Corporation has not engaged in subprime residential mortgage originations.
Residential mortgage loans present a moderate level of risk due primarily to general economic conditions, as well as a currently weakened housing market.
Home Equity Lines of Credit Lending — The Corporation originates home equity lines of credit primarily within the Corporation’s market area or with customers primarily from the market area. Home equity lines of credit are generated by the Corporation’s marketing efforts, its present customers, walk-in customers, and referrals.
Home equity lines of credit are secured by the borrower’s primary residence with a maximum loan-to-value of 90% and a maximum term of 20 years. In underwriting home equity lines of credit, a thorough analysis of the borrower’s financial ability to repay the loan as agreed is performed. The ability to repay is determined by the borrower’s employment history, current financial condition, and credit background.
Home equity lines of credit generally present a moderate level of risk due primarily to general economic conditions, as well as a continued weak housing market.
Junior liens inherently have more credit risk by virtue of the fact that another financial institution may have a higher security position in the case of foreclosure liquidation of collateral to extinguish the debt. Generally, foreclosure actions could become more prevalent if the real estate market continues to be weak and property values deteriorate.
Consumer Lending — The Corporation offers a variety of secured and unsecured consumer loans, including those for vehicles and mobile homes and loans secured by savings deposits. These loans originate primarily within the Corporation’s market area or with customers primarily from the market area.
Consumer loan terms vary according to the type and value of collateral and the creditworthiness of the borrower. In underwriting consumer loans, a thorough analysis of the borrower’s financial ability to repay the loan as agreed is performed. The ability to repay shall be determined by the borrower’s employment history, current financial condition, and credit background.
Consumer loans may entail greater credit risk than residential mortgage loans or home equity lines of credit, particularly in the case of consumer loans which are unsecured or are secured by rapidly depreciable assets such as automobiles or recreational equipment. In such cases, any repossessed collateral for a defaulted consumer loan may not provide an adequate source of repayment of the outstanding loan balance as a result of the greater likelihood of damage, loss or depreciation. In addition, consumer loan collections are dependent on the borrower’s continuing financial stability, and thus are more likely to be affected by adverse personal circumstances. Furthermore, the application of various federal and state laws, including bankruptcy and insolvency laws, may limit the amount which can be recovered on such loans.
Off-Balance Sheet Credit-Related Financial Instruments
In the ordinary course of business, the Corporation has entered into commitments to extend credit, including commitments under commercial lines of credit, and standby letters of credit. Such financial instruments are recorded when they are funded.
Foreclosed Assets
Assets acquired through, or in lieu of, loan foreclosure are held for sale and are initially recorded at fair value, less costs to sell at the date of foreclosure, establishing a new cost basis. Subsequent to foreclosure, valuations are periodically performed by management and the assets are adjusted to the fair value, less costs to sell as necessary. Revenue and expenses from operations and changes in the valuation allowance are included in net expenses from foreclosed assets.
Premises and Equipment
Land is carried at cost. Buildings, furniture, fixtures, equipment and leasehold improvements are carried at cost, less accumulated depreciation. Depreciation is computed principally by the straight-line method over the assets’ estimated useful lives. Maintenance and normal repairs are charged to expense when incurred while major additions and improvements are capitalized. Gains and losses on disposals are reflected in current operations. Amortization of leasehold improvements is computed by straight line over the shorter of the assets’ useful life or the related lease term.
Investments in Low-Income Housing Partnerships
The Corporation’s investments in low-income housing partnerships are accounted for using the “equity method” prescribed by ASC Topic 323, Investments — Equity Method. In accordance with ASC Topic 740, Income Taxes, tax credits are recognized as they become available. Any residual loss is amortized as the tax credits are received.
Bank-Owned Life Insurance
The Corporation’s banking subsidiary maintains nonqualified compensation plans for selected senior officers. To fund the benefits under these plans, the Bank is the owner of single premium life insurance policies on participants in the nonqualified retirement plans. Investment in bank-owned life insurance policies was used to finance the nonqualified compensation plans and provide tax-exempt income to the Corporation.
ASC Topic 715, Compensation—Retirement Benefits, requires a liability to be recorded during the service period when a split-dollar life insurance agreement continues after participants’ employment or retirement. The required accrued liability is based on either the post-employment benefit cost for continuing life insurance or based on the future death benefit depending on the contractual terms of the underlying agreement. The Corporation’s liability is based on the post-employment benefit cost for continuing life insurance. The Corporation incurred approximately $47,000, $28,000, and $22,000 of expense in 2013, 2012, and 2011, respectively, related to these benefits.
Transfers of Financial Assets
Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Corporation, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) the Corporation does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity or the ability to unilaterally cause the holder to return specific assets.
Income Taxes
The Corporation accounts for income taxes in accordance with income tax accounting guidance ASC Topic 740, Income Taxes.
Current income tax accounting guidance results in two components of income tax expense: current and deferred. Current income tax expense reflects taxes to be paid or refunded for the current period by applying the provisions of the enacted tax law to the taxable income or excess of deductions over revenues. The Corporation determines deferred income taxes using the liability (or balance sheet) method. Under this method, the net deferred tax asset or liability is based on the tax effects of the differences between the book and tax bases of assets and liabilities, and enacted changes in tax rates and laws are recognized in the period in which they occur.
Deferred income tax expense results from changes in deferred tax assets and liabilities between periods. Deferred tax assets are reduced by a valuation allowance if, based on the weight of the evidence available, it is more likely than not that some portion or all of a deferred tax asset will not be realized.
The Corporation accounts for uncertain tax positions if it is more likely than not, based on the technical merits, that the tax position will be realized or sustained upon examination. The term more-likely-than-not means a likelihood of more than 50%; the terms examined and upon examination also include resolution of the related appeals or litigation processes, if any. A tax position that meets the more-likely-than-not recognition threshold is initially and subsequently measured as the largest amount of tax benefit that has a greater than 50% likelihood of being realized upon settlement with a taxing authority that has full knowledge of all relevant information. The determination of whether or not a tax position has met the more-likely-than-not recognition threshold considers the facts, circumstances, and information available at the reporting date and is subject to management’s judgment.
The Corporation recognizes interest and penalties on income taxes, if any, as a component of income tax expense.
Retirement Plan
The compensation cost of an employee’s pension benefit is recognized on the projected unit credit method over the employee’s approximate service period. The aggregate cost method is utilized for funding purposes.
Net Income per Share
The Corporation has a simple capital structure. Basic earnings per share of common stock is computed based on 5,976,960, 5,953,723 and 5,936,030 weighted average shares of common stock outstanding for 2013, 2012 and 2011, respectively.
Advertising Costs
Costs of advertising, which are included in marketing expenses, are expensed when incurred.
Intangible Assets
The Corporation accounts for its acquisitions using the purchase accounting method required by ASC Topic 805, Business Combinations. Purchase accounting requires the total purchase price to be allocated to the estimated fair values of assets and liabilities acquired, including certain intangible assets that must be recognized. Generally, this results in a residual amount in excess of the net fair values, which is recorded as goodwill.
ASC Topic 350, Intangibles—Goodwill and Other, requires that goodwill is not amortized to expense, but rather that it be assessed for impairment at least annually. If certain events occur which might indicate goodwill has been impaired, the goodwill is tested for impairment when such events occur. Impairment write-downs are charged to results of operations in the period in which the impairment is determined. During the quarter ended June 30, 2012, the Corporation changed its method of applying ASC 350, such that the annual goodwill impairment testing date was changed from December 31 to October 1. This new testing date is preferable in the circumstances, because it allowed the Corporation more time to accurately complete its impairment testing process in order to incorporate the results in the annual consolidated financial statements. The Corporation did not identify any impairment on its outstanding goodwill from its most recent testing, which was performed as of October 1, 2013. Other acquired intangible assets with finite lives, such as customer lists, are required to be amortized over the estimated lives. These intangibles are generally amortized using the straight line method over estimated useful lives of ten years.
Accumulated Other Comprehensive Income (Loss)
The components of the accumulated other comprehensive income (loss), net of taxes, are as follows:
In thousands	Unrealized		Pension			Accumulated
	Gains on		Liability			Other
	Securities					Comprehensive
						Income (Loss)
BALANCE — DECEMBER 31, 2013	$	2,572	$	(2,466	)	$	106
BALANCE — DECEMBER 31, 2012	$	5,614	$	(5,826	)	$	(212	)
Segment Reporting
The Bank acts as an independent community financial services provider, which offers traditional banking and related financial services to individual, business, and government customers. Through its branch and automated teller machine networks, the Bank offers a full array of commercial and retail financial services, including the taking of time, savings, and demand deposits; the making of commercial, consumer, and mortgage loans; and the providing of other financial services. Management does not separately allocate expenses, including the cost of funding loan demand, between the commercial, retail and mortgage banking operations of the Bank. As such, discrete financial information for commercial, retail and mortgage banking operations is not available and segment reporting would not be meaningful. Please refer to Note S — “Segment and Related Information” for a discussion of insurance operations.
New Accounting Pronouncements
There were no new accounting pronouncements affecting the Corporation during the year ended December 31, 2013 that have not been adopted by the Corporation in previous periods. In addition, there are no recently issued accounting standards that are expected to have a material impact on the Corporation’s consolidated financial statements in future periods.

Restrictions_On_Cash_and_Due_F

Restrictions On Cash and Due From Banks	12 Months Ended
	Dec. 31, 2013
Restricted Cash and Investments [Abstract]	'
RESTRICTIONS ON CASH AND DUE FROM BANKS	'
	RESTRICTIONS ON CASH AND DUE FROM BANKS
	In return for services obtained through correspondent banks, the Corporation is required to maintain non-interest bearing cash balances in those correspondent banks. At December 31, 2013 and 2012, compensating balances approximated $1,673,000 and $1,969,000, respectively. During 2013 and 2012, average compensating balances approximated $2,181,000 and $2,327,000, respectively. All compensating balances are met by vault cash.

Securities

Securities	12 Months Ended
	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]	'
SECURITIES	'
	SECURITIES
	Amortized cost and fair value at December 31, 2013 and 2012, were as follows:
	In thousands	Amortized		Gross		Gross		Fair
		Cost		Unrealized		Unrealized		Value
				Gains		Losses
	SECURITIES AVAILABLE FOR SALE
	31-Dec-13
	U.S. Government and agencies	$	21,094	$	557	$	—	$	21,651
	Mortgage-backed securities, residential	51,541		2,322		123		53,740
	State and municipal	40,780		1,117		375		41,522
	Corporate bonds	11,004		192		31		11,165
	CRA mutual fund	1,044		—		11		1,033
	Stock in other banks	627		245		—		872
		$	126,090	$	4,433	$	540	$	129,983
	31-Dec-12
	U.S. Government and agencies	$	23,225	$	1,016	$	—	$	24,241
	Mortgage-backed securities, residential	75,816		4,767		—		80,583
	State and municipal	49,568		2,246		10		51,804
	Corporate bonds	7,008		286		8		7,286
	CRA mutual fund	1,044		52		—		1,096
	Stock in other banks	627		153		—		780
		$	157,288	$	8,520	$	18	$	165,790
	SECURITIES HELD TO MATURITY
	31-Dec-13
	U.S. Government and agencies	$	37,528	$	142	$	923	$	36,747
	Mortgage-backed securities, residential	56,845		40		1,550		55,335
		$	94,373	$	182	$	2,473	$	92,082
	31-Dec-12
	U.S. Government and agencies	$	30,115	$	536	$	6	$	30,645
	Mortgage-backed securities, residential	$	20,044	$	298	$	7	$	20,335
		$	50,159	$	834	$	13	$	50,980
	The following table shows the Corporation’s investments’ gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2013 and 2012:
		Less than 12 Months				12 Months or More				Total
	In thousands	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
		Value		Losses		Value		Losses		Value		Losses
	SECURITIES AVAILABLE FOR SALE
	December 31, 2013
	Mortgage-backed securities, residential	$	6,944	$	123	$	—	$	—	$	6,944	$	123
	State and municipal	11,107		340		1,070		35		12,177		375
	Corporate bonds	4,969		31		—		—		4,969		31
	CRA Mutual Fund	1,033		11		—		—		1,033		11
		$	24,053	$	505	$	1,070	$	35	$	25,123	$	540
	December 31, 2012
	State and municipal	$	1,975	$	10	$	—	$	—	$	1,975	$	10
	Corporate bond	992		8		—		—		992		8
		$	2,967	$	18	$	—	$	—	$	2,967	$	18
	SECURITIES HELD TO MATURITY
	December 31, 2013
	U.S. Government and agencies	$	22,710	$	812	$	2,889	$	111	$	25,599	$	923
	Mortgage-backed securities, residential	45,891		1,446		1,755		104		47,646		1,550
		$	68,601	$	2,258	$	4,644	$	215	$	73,245	$	2,473
	31-Dec-12
	U.S. Government and agencies	$	2,994	$	6	$	—	$	—	$	2,994	$	6
	Mortgage-backed security, residential	$	2,046	$	7	$	—	$	—	$	2,046	$	7
		$	5,040	$	13	$	—	$	—	$	5,040	$	13
	All mortgage-backed security investments are government sponsored enterprise (GSE) pass-through instruments issued by the Federal National Mortgage Association (FNMA), Government National Mortgage Association (GNMA) or Federal Home Loan Mortgage Corporation (FHLMC), which guarantee the timely payment of principal on these investments.
	At December 31, 2013, seven available for sale residential mortgage-backed securities had unrealized losses that individually did not exceed 3% of amortized cost. These securities have not been in a continuous loss position for 12 months or more. These unrealized losses relate principally to changes in interest rates subsequent to the acquisition of the specific securities.
	At December 31, 2013, twenty-six available for sale state and municipal securities had unrealized losses that individually did not exceed 8% of amortized cost. Three of these securities have been in a continuous loss position for 12 months or more. These unrealized losses relate principally to changes in interest rates subsequent to the acquisition of the specific securities.
	At December 31, 2013, one available for sale corporate bond had an unrealized loss and has not been in a continuous loss position for 12 months or more. This unrealized loss relates principally to changes in interest rates subsequent to the acquisition of the specific security. This security had an unrealized loss of less than 1% of amortized cost.
	At December 31, 2013, the CRA Mutual Fund had an unrealized loss that individually did not exceed 2% of amortized cost. This security has not been in a continuous loss position for 12 months or more. This unrealized loss relates principally to changes in interest rates subsequent to the acquisition of the specific security.
	At December 31, 2013, seventeen held to maturity U.S. Government and agency securities had unrealized losses that individually did not exceed 8% of amortized cost. Two of these securities have been in a continuous loss position for 12 months or more. These unrealized losses relate principally to changes in interest rates subsequent to the acquisition of the specific securities.
	At December 31, 2013, thirty held to maturity residential mortgage-backed securities had unrealized losses that individually did not exceed 8% of amortized cost. One of these securities has been in a continuous loss position for 12 months or more. This unrealized loss relates principally to changes in interest rates subsequent to the acquisition of the specific securities.
	In analyzing the issuer’s financial condition, management considers industry analysts’ reports, financial performance, and projected target prices of investment analysts within a one-year time frame. Based on the above information, management has determined that none of these investments are other-than-temporarily impaired.
The fair values of securities available for sale (carried at fair value) and held to maturity (carried at amortized cost) are determined by obtaining quoted market prices on nationally recognized securities exchanges (Level 1), or matrix pricing (Level 2), which is a mathematical technique used widely in the industry to value debt securities without relying exclusively on quoted market prices for the specific securities but rather by relying on the security’s relationship to other benchmark quoted prices. The Corporation uses independent service providers to provide matrix pricing.
Management routinely sells securities from its available for sale portfolio in an effort to manage and allocate the portfolio. At December 31, 2013, management had not identified any securities with an unrealized loss that it intends to sell or will be required to sell. In estimating other-than-temporary impairment losses on debt securities, management considers (1) whether management intends to sell the security, or (2) if it is more likely than not that management will be required to sell the security before recovery, or (3) if management does not expect to recover the entire amortized cost basis. In assessing potential other-than-temporary impairment for equity securities, consideration is given to management’s intention and ability to hold the securities until recovery of unrealized losses.
Amortized cost and fair value at December 31, 2013, by contractual maturity, where applicable, are shown below. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay with or without penalties.
	Available for Sale				Held to Maturity
In thousands	Amortized		Fair		Amortized		Fair
	Cost		Value		Cost		Value
1 year or less	$	5,824	$	5,908	$	10,006	$	10,147
Over 1 year through 5 years	33,668		34,918		19,064		18,610
Over 5 years through 10 years	30,408		30,474		8,458		7,990
Over 10 years	2,978		3,038		—		—
Mortgage-backed securities, residential	51,541		53,740		56,845		55,335
CRA mutual fund	1,044		1,033		—		—
Stock in other banks	627		872		—		—
	$	126,090	$	129,983	$	94,373	$	92,082
The Corporation realized gross gains of $0 during 2013, $7,000 during 2012, and $1,000 during 2011 and gross losses of $0 during 2013, 2012, and 2011 on sales or calls of securities available for sale.
At December 31, 2013 and 2012, securities with a carrying value of $139,966,000 and $147,923,000, respectively, were pledged as collateral as required by law on public and trust deposits, repurchase agreements, and for other purposes.

Loans

Loans	12 Months Ended
	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]	'
LOANS	'
	LOANS
	The Corporation grants commercial, residential, and consumer loans to customers primarily within southcentral Pennsylvania and northern Maryland and the surrounding area. A large portion of the loan portfolio is secured by real estate. Although the Bank has a diversified loan portfolio, its debtors’ ability to honor their contracts is influenced by the region’s economy.
	The following tables present the classes of the loan portfolio summarized by the aggregate pass rating and the classified ratings of special mention, substandard and doubtful within the Corporation’s internal risk rating system as of December 31, 2013 and 2012:
	In thousands	Pass				Special				Substandard				Doubtful			Total
						Mention
	December 31, 2013
	Commercial and industrial	$	53,316			$	2,364			$	3,537			$	—		$	59,217
	Commercial real estate	193,162				29,655				16,369				—			239,186
	Commercial real estate construction	5,123				5,018				1,055				—			11,196
	Residential mortgage	344,847				2,551				3,611				—			351,009
	Home equity lines of credit	53,021				608				223				—			53,852
	Consumer	14,188				—				—				—			14,188
	Total	$	663,657			$	40,196			$	24,795			$	—		$	728,648
	December 31, 2012
	Commercial and industrial	$	44,072			$	2,491			$	2,441			$	—		$	49,004
	Commercial real estate	205,449				20,379				17,191				—			243,019
	Commercial real estate construction	7,354				9,820				1,980				—			19,154
	Residential mortgage	321,986				4,502				2,348				—			328,836
	Home equity lines of credit	51,096				1,776				258				—			53,130
	Consumer	14,993				—				—				—			14,993
	Total	$	644,950			$	38,968			$	24,218			$	—		$	708,136
	The following table summarizes information relative to impaired loans by loan portfolio class as of December 31, 2013 and 2012:
		Impaired Loans with Allowance												Impaired Loans with
														No Allowance
	In thousands	Recorded				Unpaid				Related				Recorded			Unpaid
		Investment				Principal				Allowance				Investment			Principal
						Balance											Balance
	December 31, 2013
	Commercial and industrial	$	—			$	—			$	—			$	1,574		$	2,688
	Commercial real estate	—				—				—				11,197			11,758
	Commercial real estate construction	—				—				—				788			1,062
	Residential mortgage	1,478				1,478				201				675			712
	Total	$	1,478			$	1,478			$	201			$	14,234		$	16,220
	December 31, 2012
	Commercial and industrial	$	146			$	146			$	29			$	195		$	1,310
	Commercial real estate	237				276				7				8,772			9,216
	Commercial real estate construction	—				—				—				854			1,128
	Residential mortgage	—				—				—				938			1,263
	Total	$	383			$	422			$	36			$	10,759		$	12,917
	The following table summarizes information in regards to average of impaired loans and related interest income by loan portfolio class:
		Impaired Loans with								Impaired Loans with
		Allowance								No Allowance
	In thousands	Average				Interest				Average				Interest
		Recorded				Income				Recorded				Income
		Investment								Investment
	December 31, 2013
	Commercial and industrial	$	58			$	—			$	466			$	—
	Commercial real estate	95				—				11,237				529
	Commercial real estate construction	—				—				3,558				209
	Residential mortgage	833				—				1,119				10
	Total	$	986			$	—			$	16,380			$	748
	December 31, 2012
	Commercial and industrial	$	431			$	—			$	223			$	—
	Commercial real estate	691				—				8,193				11
	Commercial real estate construction	336				—				1,242				—
	Residential mortgage	18				—				1,390				—
	Total	$	1,476			$	—			$	11,048			$	11
	December 31, 2011
	Commercial and industrial	$	1,019			$	—			$	349			$	—
	Commercial real estate	2,324				—				4,946				44
	Commercial real estate construction	—				—				3,463				—
	Residential mortgage	340				—				1,119				—
	Total	$	3,683			$	—			$	9,877			$	44
No additional funds are committed to be advanced in connection with impaired loans.
If interest on all nonaccrual loans had been accrued at original contract rates, interest income would have increased by $704,000 in 2013, $543,000 in 2012, and $652,000 in 2011.
The following table presents nonaccrual loans by loan portfolio class as of December 31, 2013 and 2012:
In thousands	2013				2012
Commercial and industrial	$	1,574			$	342
Commercial real estate	4,363				4,514
Commercial real estate construction	788				854
Residential mortgage	1,848				617
Total	$	8,573			$	6,327
The following table summarizes information relative to troubled debt restructurings by loan portfolio class at December 31, 2013 and 2012:
In thousands	Pre-Modification				Post-Modification				Recorded Investment at period end
	Outstanding Recorded				Outstanding Recorded
	Investment				Investment
December 31, 2013
Nonaccruing troubled debt restructurings:
Commercial and industrial	$	490			$	485			$	142
Commercial real estate	1,021				1,021				634
Commercial real estate construction	1,548				1,541				694
Residential mortgage	566				566				566
Total nonaccruing troubled debt restructurings	3,625				3,613				2,036
Accruing troubled debt restructurings:
Commercial real estate	7,118				7,170				6,834
Residential mortgage	336				336				305
Total accruing troubled debt restructurings	7,454				7,506				7,139
Total Troubled Debt Restructurings	$	11,079			$	11,119			$	9,175
December 31, 2012
Nonaccruing troubled debt restructurings:
Commercial and industrial	$	490			$	485			$	187
Commercial real estate	1,304				1,304				953
Commercial real estate construction	1,548				1,541				760
Total nonaccruing troubled debt restructurings	$	3,342			$	3,330			$	1,900
Accruing troubled debt restructurings:
Commercial real estate	$	4,577			$	4,577			$	4,494
Residential mortgage	336				336				321
Total accruing troubled debt restructurings	4,913				4,913				4,815
Total Troubled Debt Restructurings	$	8,255			$	8,243			$	6,715
All of the Corporation’s troubled debt restructured loans are also impaired loans, of which some have resulted in a specific allocation and, subsequently, a charge-off as appropriate. During the year ended December 31, 2013, one troubled debt restructured loan defaulted in the amount of $237,000 and all other troubled debt restructured loans were current with respect to their associated forbearance agreement. As of December 31, 2013, charge-offs associated with troubled debt restructured loans while under a forbearance agreement totaled $353,000. As of December 31, 2012, there was one defaulted troubled debt restructure and all other troubled debt restructured loans were current with respect to their associated forbearance agreements. One forbearance agreement was negotiated during 2009 and modified during 2011, two were negotiated during 2010 and modified during 2013, three were negotiated during 2012, while two were negotiated during 2013.
There are forbearance agreements on all loans currently classified as troubled debt restructurings, except for two loans in which the forbearance agreement has expired and one loan in which a modification took place, all of which remain classified as troubled debt restructured loans. All of these troubled debt restructured loans have resulted in additional principal repayment. The terms of these troubled debt restructured loans vary whereby principal payments have been decreased, interest rates have been reduced, and/or the loan will be repaid as collateral is sold.
The following table summarizes loans whose terms have been modified resulting in troubled debt restructurings during the years ended December 31, 2013 and 2012:
Dollars in thousands	Number of Contracts			Pre-Modification Outstanding Recorded Investment				Post-Modification Outstanding Recorded Investment				Recorded Investment at period end
2013
Troubled debt restructurings:
Commercial real estate	1			$	2,541			$	2,593			$	2,542
Residential mortgage	1			566				566				566
2012
Troubled debt restructurings:
Commercial real estate	2			$	5,225			$	5,225			$	5,099
Residential mortgage	1			336				336				321
The performance and credit quality of the loan portfolio is also monitored by analyzing the age of the loans receivable as determined by the length of time a recorded payment is past due.
The following table presents the classes of the loan portfolio summarized by the past due status as of December 31, 2013 and 2012:
In thousands	30-59 Days				60-89 Days				>90 Days Past Due				Total Past Due			Current			Total Loans			Loans
	Past Due				Past Due														Receivable			Receivable
																						>90 Days and
																						Accruing
December 31, 2013
Commercial and industrial	$	55			$	13			$	152			$	220		$	58,997		$	59,217		$	3
Commercial real estate	857				552				1,964				3,373			235,813			239,186			—
Commercial real estate construction	—				—				788				788			10,408			11,196			—
Residential mortgage	4,728				795				3,148				8,671			342,338			351,009			1,900
Home equity lines of credit	260				36				14				310			53,542			53,852			14
Consumer	22				15				9				46			14,142			14,188			9
Total	$	5,922			$	1,411			$	6,075			$	13,408		$	715,240		$	728,648		$	1,926
December 31, 2012
Commercial and industrial	$	128			$	—			$	342			$	470		$	48,534		$	49,004		$	1
Commercial real estate	757				1,569				1,502				3,828			239,191			243,019			6
Commercial real estate construction	—				—				854				854			18,300			19,154			—
Residential mortgage	4,197				2,425				1,339				7,961			320,875			328,836			721
Home equity lines of credit	353				10				43				406			52,724			53,130			43
Consumer	8				4				—				12			14,981			14,993			—
Total	$	5,443			$	4,008			$	4,080			$	13,531		$	694,605		$	708,136		$	771
The following table summarizes the allowance for loan losses and recorded investment in financing receivables:
In thousands	Commercial				Commercial				Commercial				Residential			Home Equity			Consumer			Unallocated			Total
	and Industrial				Real Estate				Real Estate				Mortgage			Lines of Credit
									Construction
December 31, 2013
Allowance for loan losses
Beginning balance- January 1, 2013	$	1,507			$	6,576			$	518			$	3,721		$	517		$	633		$	3,353		$	16,825
Charge-offs	(178		)		(996		)		—				(1,062		)	—			(191		)	—			(2,427		)
Recoveries	235				—				—				4			—			4			—			243
Provisions	351				239				(271		)		1,350			20			501			(740		)	1,450
Ending balance- December 31, 2013	$	1,915			$	5,819			$	247			$	4,013		$	537		$	947		$	2,613		$	16,091
Ending balance: individually evaluated for impairment	$	—			$	—			$	—			$	201		$	—		$	—		$	—		$	201
Ending balance: collectively evaluated for impairment	$	1,915			$	5,819			$	247			$	3,812		$	537		$	947		$	2,613		$	15,890
Loans receivables
Ending balance	$	59,217			$	239,186			$	11,196			$	351,009		$	53,852		$	14,188		$	—		$	728,648
Ending balance: individually evaluated for impairment	$	1,574			$	11,197			$	788			$	2,153		$	—		$	—		$	—		$	15,712
Ending balance: collectively evaluated for impairment	$	57,643			$	227,989			$	10,408			$	348,856		$	53,852		$	14,188		$	—		$	712,936
December 31, 2012
Allowance for loan losses
Beginning balance- January 1, 2012	$	2,582			$	6,007			$	548			$	3,624		$	507		$	419		$	1,795		$	15,482
Charge-offs	(2,180		)		(417		)		(538		)		(500		)	(51		)	(71		)	—			(3,757		)
Recoveries	22				250				149				1			—			3			—			425
Provisions	1,083				736				359				596			61			282			1,558			4,675
Ending balance- December 31, 2012	$	1,507			$	6,576			$	518			$	3,721		$	517		$	633		$	3,353		$	16,825
Ending balance: individually evaluated for impairment	$	29			$	7			$	—			$	—		$	—		$	—		$	—		$	36
Ending balance: collectively evaluated for impairment	$	1,478			$	6,569			$	518			$	3,721		$	517		$	633		$	3,353		$	16,789
Loans receivables
Ending balance	$	49,004			$	243,019			$	19,154			$	328,836		$	53,130		$	14,993		$	—		$	708,136
Ending balance: individually evaluated for impairment	$	341			$	9,009			$	854			$	938		$	—		$	—		$	—		$	11,142
Ending balance: collectively evaluated for impairment	$	48,663			$	234,010			$	18,300			$	327,898		$	53,130		$	14,993		$	—		$	696,994
In thousands	Commercial				Commercial				Commercial				Residential			Home Equity			Consumer			Unallocated			Total
	and Industrial				Real Estate				Real Estate				Mortgage			Lines of Credit
									Construction
December 31, 2011
Allowance for loan losses
Beginning balance- January 1, 2011	$	2,074			$	6,346			$	1,154			$	3,108		$	341		$	520		$	1,709		$	15,252
Charge-offs	(1,861		)		(1,308		)		(1,242		)		(750		)	(52		)	(30		)	—			(5,243		)
Recoveries	34				—				—				2			—			2			—			38
Provisions	2,335				969				636				1,264			218			(73		)	86			5,435
Ending balance- December 31, 2011	$	2,582			$	6,007			$	548			$	3,624		$	507		$	419		$	1,795		$	15,482
Ending balance: individually evaluated for impairment	$	1,085			$	43			$	—			$	53		$	—		$	—		$	—		$	1,181
Ending balance: collectively evaluated for impairment	$	1,497			$	5,964			$	548			$	3,571		$	507		$	419		$	1,795		$	14,301
Loans receivables
Ending balance	$	56,145			$	236,017			$	22,757			$	311,266		$	52,532		$	15,751		$	—		$	694,468
Ending balance: individually evaluated for impairment	$	2,219			$	6,612			$	2,614			$	1,401		$	—		$	—		$	—		$	12,846
Ending balance: collectively evaluated for impairment	$	53,926			$	229,405			$	20,143			$	309,865		$	52,532		$	15,751		$	—		$	681,622
The Bank has granted loans to certain of its executive officers, directors and their related interests. These loans were made on substantially the same basis, including interests rates and collateral as those prevailing for comparable transactions with other borrowers at the same time. The aggregate amount of these loans was $14,969,000 and $12,351,000 at December 31, 2013 and 2012, respectively. During 2013, $4,476,000 of new loans and advances were extended and repayments totaled $1,858,000. None of these loans were past due, in nonaccrual status, or restructured at December 31, 2013.

Premises_and_Equipment

Premises and Equipment	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
PREMISES AND EQUIPMENT	'
	PREMISES AND EQUIPMENT
	Premises and equipment at December 31 were as follows:
	In thousands	2013			2012
	Land	$	2,591		$	2,591
	Buildings and improvements	17,060			17,004
	Furniture and equipment	12,946			12,820
	Construction in process	1,959			13
		34,556			32,428
	Accumulated depreciation	(18,565		)	(17,297		)
		$	15,991		$	15,131
	Depreciation expense was $1,352,000, $1,401,000 and $1,578,000 for the years ended December 31, 2013, 2012 and 2011, respectively.

Investments_in_LowIncome_Housi

Investments in Low-Income Housing Partnerships	12 Months Ended
	Dec. 31, 2013
Real Estate Partnership Investment Subsidiaries, Net Income (Loss) before Tax [Abstract]	'
INVESTMENTS IN LOW-INCOME HOUSING PARTNERSHIPS	'
	INVESTMENTS IN LOW-INCOME HOUSING PARTNERSHIPS
	ACNB Corporation is a limited partner in five partnerships, whose purpose is to develop, manage and operate residential low-income properties. At December 31, 2013 and 2012, the carrying value of these investments was approximately $4,687,000 and $5,440,000, respectively.

Deposits

Deposits	12 Months Ended
	Dec. 31, 2013
Interest-bearing Deposit Liabilities [Abstract]	'
DEPOSITS	'
	DEPOSITS
	Deposits were comprised of the following as of December 31:
	In thousands	2013		2012
	Non-interest bearing demand	$	128,011	$	119,297
	Interest bearing demand	115,014		122,717
	Savings	321,818		320,454
	Time certificates of deposit less than $100,000	165,491		191,019
	Time certificates of deposit greater than $100,000	70,309		80,689
		$	800,643	$	834,176
	Scheduled maturities of time certificates of deposit at December 31, 2013, were as follows:
	Years Ending	In thousands
	2014	$	152,255
	2015	34,252
	2016	41,156
	2017	4,162
	2018	3,975
		$	235,800

Lease_Commitments

Lease Commitments	12 Months Ended
	Dec. 31, 2013
Leases [Abstract]	'
LEASE COMMITMENTS	'
	LEASE COMMITMENTS
	Certain branch offices and equipment are leased under agreements which expire at varying dates through 2024. Most leases contain renewal provisions at the Corporation’s option. The total rental expense for all operating leases was $468,000, $424,000 and $405,000 for the years ended December 31, 2013, 2012 and 2011, respectively.
	The following is a schedule by year of future minimum rental payments required under operating leases that have initial or remaining non-cancelable lease terms in excess of one year as of December 31:
	Years Ending	In thousands
	2014	$	413
	2015	343
	2016	230
	2017	86
	2018	86
	Later years	303
		$	1,461
	ACNB leases space at several of its owned offices to other unrelated organizations under agreements that expire at varying dates in 2014. Most leases contain renewal provisions at the option of the lessee. Total rental income for these properties was $138,000, $133,000 and $130,000 for the years ended December 31, 2013, 2012 and 2011, respectively.

Borrowings

Borrowings	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
BORROWINGS	'
	BORROWINGS
	Short-term borrowings and weighted-average interest rates at December 31 are as follows:
		2013						2012
	Dollars in thousands	Amount			Rate			Amount				Rate
	FHLB overnight advance	$	6,800		0.25	%		$	—			—	%
	Securities sold under repurchase agreements	42,252			0.12	%		47,303				0.14	%
		$	49,052		0.14	%		$	47,303			0.14	%
	Under an agreement with the FHLB, the Bank has short-term borrowing capacity included within its maximum borrowing capacity. All FHLB advances are collateralized by a security agreement covering qualifying loans and unpledged U.S. Treasury, agency and mortgage-backed securities. In addition, all FHLB advances are secured by the FHLB capital stock owned by the Bank having a par value of $6,563,000 at December 31, 2013. The Corporation also has average lines of credit that total $15,000,000 with correspondent banks for overnight federal funds borrowings. There were no advances on these lines at December 31, 2013 and 2012.
	The Corporation enters into agreements under which it sells securities subject to an obligation to repurchase the same or similar securities. Under these arrangements, the Corporation may transfer legal control over the assets but still retain effective control through an agreement that both entitles and obligates the Corporation to repurchase the assets. As a result, these repurchase agreements are accounted for as collateralized financing agreements (i.e., secured borrowings) and not as a sale and subsequent repurchase of securities. The obligation to repurchase the securities is reflected as a liability in the Corporation’s consolidated statements of condition, while the securities underlying the repurchase agreements remain in the respective investment securities asset accounts. In other words, there is no offsetting or netting of the investment securities assets with the repurchase agreement liabilities. In addition, as the Corporation does not enter into reverse repurchase agreements, there is no such offsetting to be done with the repurchase agreements.
	The right of setoff for a repurchase agreement resembles a secured borrowing, whereby the collateral would be used to settle the fair value of the repurchase agreement should the Corporation be in default (e.g., fails to make an interest payment to the counterparty). For private institution repurchase agreements, if the private institution counterparty were to default (e.g., declare bankruptcy), the Corporation could cancel the repurchase agreement (i.e., cease payment of principal and interest), and attempt collection on the amount of collateral value in excess of the repurchase agreement fair value. The collateral is held by a third-party financial institution in the counterparty’s custodial account. The counterparty has the right to sell or repledge the investment securities. For government entity repurchase agreements, the collateral is held by the Corporation in a segregated custodial account under a tri-party agreement.
	The following table presents the liabilities subject to an enforceable master netting arrangement or repurchase agreements as of December 31, 2013 and 2012:
														Gross Amounts Not Offset in the Statements of Condition
	Dollars in thousands		Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Statements of Condition				Net Amounts of Liabilities Presented in the Statements of Condition				Financial Instruments			Cash Collateral Pledged		Net Amount
	31-Dec-13
	Repurchase agreements
	Commercial customers and government entities	(a)	$	42,252		$	—			$	42,252			$	(42,252	)	$	—	$	—
	31-Dec-12
	Repurchase agreements
	Commercial customers and government entities	(a)	$	47,303		$	—			$	47,303			$	(47,303	)	$	—	$	—
	(a) As of December 31, 2013 and 2012, the fair value of securities pledged in connection with repurchase agreements was $60,823,000 and $56,392,000, respectively.
	A summary of long-term debt as of December 31 is as follows:
		2013						2012
	Dollars in thousands	Amount			Rate			Amount				Rate
	FHLB fixed-rate advances maturing:
	2013	$	—		—	%		$	14,000			2.55	%
	2014	29,000			1.51	%		14,000				2.73	%
	2015	21,000			2.5	%		15,000				3.25	%
	2016	15,000			2.19	%		9,000				2.56	%
	2017	6,000			3.76	%		4,000				4.86	%
	2018	10,000			2.48	%		2,000				5.11	%
	Loan payable to local bank	1,703			6.02	%		1,954				5.96	%
		$	82,703		3.08	%		$	59,954			3.86	%
	The FHLB advances are collateralized by the assets defined in security agreement and FHLB capital stock described previously. The Corporation can borrow a maximum of $420,550,000 from the FHLB, of which $332,750,000 was available at December 31, 2013.
	The loan payable to a local bank is payable in monthly installments of $29,472 and matures in April 2016. The loan is unsecured.

Regulatory_Restrictions_On_Div

Regulatory Restrictions On Dividends	12 Months Ended
	Dec. 31, 2013
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]	'
REGULATORY RESTRICTIONS ON DIVIDENDS	'
	REGULATORY RESTRICTIONS ON DIVIDENDS
	Dividend payments by the Bank to the Corporation are subject to the Pennsylvania Banking Code, the Federal Deposit Insurance Act, and the regulations of the FDIC. Under the Banking Code, no dividends may be paid except from “accumulated net earnings” (generally, retained earnings). The Federal Reserve Board and the FDIC have formal and informal policies which provide that insured banks and bank holding companies should generally pay dividends only out of current operating earnings, with some exceptions. As of December 31, 2013, $10,772,000 of undistributed earnings of the Bank, included in consolidated retained earnings, was available for distribution to the Corporation as dividends without prior regulatory approval. Additionally, dividends paid by the Bank to the Corporation would be prohibited if the effect thereof would cause the Bank’s capital to be reduced below applicable minimum capital requirements.

Income_Taxes

Income Taxes	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
INCOME TAXES	'
	INCOME TAXES
	The components of income tax expense for the years ended December 31, 2013, 2012 and 2011, are as follows:
	In thousands	2013			2012				2011
	Federal:
	Current	$	1,800		$	2,163			$	1,816
	Deferred	693			108				279
		2,493			2,271				2,095
	State:
	Current	42			48				59
		$	2,535		$	2,319			$	2,154
	Reconciliations of the statutory federal income tax at a rate of 34% to the income tax expense reported in the consolidated statements of income for the years ended December 31, 2013, 2012 and 2011, are as follows:
		Percentage of Income
		before Income Taxes
		2013		2012			2011
	Federal income tax at statutory rate	34	%	34	%		34	%
	State income taxes, net of federal benefit	0.2	%	0.2	%		0.4	%
	Tax-exempt income	(4.6	)%	(5.9	)%		(6.0	)%
	Earnings on investment in bank-owned life insurance	(2.8	)%	(3.0	)%		(3.1	)%
	Rehabilitation and low-income housing credits	(5.7	)%	(4.9	)%		(5.2	)%
	Other	0.3	%	0.3	%		0.1	%
		21.4	%	20.7	%		20.2	%
	The provision for federal income taxes includes $0, $2,000 and $0 of income taxes related to net gains on sales of securities in 2013, 2012 and 2011, respectively. Rehabilitation and low-income housing income tax credits were $678,000, $556,000, and $556,000 during 2013, 2012 and 2011, respectively. Projected credits are $648,000 in 2014, $299,000 in 2015, and $2,025,000 thereafter.
	Components of deferred tax assets and liabilities at December 31 were as follows:
	In thousands	2013			2012
	Deferred tax assets:
	Allowance for loan losses	$	5,471		$	5,721
	Accrued deferred compensation	806			726
	Pension	1,269			3,000
	Deferred loan fees	5			16
	Other-than-temporary impairment	178			178
	Low-income housing tax credit carryforward	287			195
	Nonaccrual interest	191			183
	Director deferred liability	419			351
	Other	387			468
		9,013			10,838
	Deferred tax liabilities:
	Available for sale securities	1,323			2,891
	Prepaid pension benefit cost	5,488			4,741
	Prepaid expenses	237			213
	Accumulated depreciation	358			558
	Goodwill/intangibles	677			649
		8,083			9,052
	Net Deferred Tax Asset	$	930		$	1,786
	The Corporation has a federal tax credit carryforward totaling $287,000 related to low income housing credits that expires in 2032.
	The Corporation did not have any uncertain tax positions at December 31, 2013 and 2012. The Corporation’s policy is to recognize interest and penalties on unrecognized tax benefits in income tax expense in the Consolidated Statements of Income.
	Years that remain open for potential review by the Internal Revenue Service are 2010 through 2013.

Fair_Value_Measurements

Fair Value Measurements	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
FAIR VALUE MEASUREMENTS	'
	FAIR VALUE MEASUREMENTS
	Management uses its best judgment in estimating the fair value of the Corporation’s financial instruments; however, there are inherent weaknesses in any estimation technique. Therefore, for substantially all financial instruments, the fair value estimates herein are not necessarily indicative of the amounts the Corporation could have realized in a sales transaction on the dates indicated. The estimated fair value amounts have been measured as of their respective reporting dates and have not been reevaluated or updated for purposes of these consolidated financial statements subsequent to those respective dates. As such, the estimated fair values of these financial instruments subsequent to the respective reporting dates may be different than the amounts reported at each period end.
	Fair value measurement and disclosure guidance defines fair value as the price that would be received to sell the asset or transfer the liability in an orderly transaction (that is, not a forced liquidation or distressed sale) between market participants at the measurement date under current market conditions.
	Fair value measurement and disclosure guidance provides a list of factors that a reporting entity should evaluate to determine whether there has been a significant decrease in the volume and level of activity for the asset or liability in relation to normal market activity for the asset or liability. When the reporting entity concludes there has been a significant decrease in the volume and level of activity for the asset or liability, further analysis of the information from that market is needed and significant adjustments to the related prices may be necessary to estimate fair value in accordance with fair value measurement and disclosure guidance.
	This guidance further clarifies that when there has been a significant decrease in the volume and level of activity for the asset or liability, some transactions may not be orderly. In those situations, the entity must evaluate the weight of the evidence to determine whether the transaction is orderly. The guidance provides a list of circumstances that may indicate that a transaction is not orderly. A transaction price that is not associated with an orderly transaction is given little, if any, weight when estimating fair value.
	Fair value measurement and disclosure guidance establishes a fair value hierarchy that prioritizes the inputs to valuation methods used to measure fair value. The hierarchy gives the highest priority to unadjusted quoted prices in active markets for identical assets or liabilities (Level 1 measurements) and the lowest priority to unobservable inputs (Level 3 measurements). The three levels of the fair value hierarchy are as follows:
	Level 1: Unadjusted quoted prices in active markets that are accessible at the measurement date for identical, unrestricted assets or liabilities.
	Level 2: Quoted prices in markets that are not active, or inputs that are observable, either directly or indirectly, for substantially the full term of the asset or liability.
	Level 3: Prices or valuation techniques that require inputs that are both significant to the fair value measurement and unobservable (i.e., supported with little or no market activity).
	An asset or liability’s level within the fair value hierarchy is based on the lowest level of input that is significant to the fair value measurement.
	For assets measured at fair value, the fair value measurements by level within the fair value hierarchy, and the basis on measurement used at December 31, 2013 and 2012, are as follows:
				Fair Value Measurements at December 31, 2013
	In thousands	Basis		Total				Level 1				Level 2				Level 3
	U.S. Government and agencies			$	21,651			$	—			$	21,651			$	—
	Mortgage-backed securities, residential			53,740				—				53,740				—
	State and municipal			41,522				—				41,522				—
	Corporate bonds			11,165				—				11,165				—
	CRA mutual fund			1,033				1,033				—				—
	Stock in other banks			872				872				—				—
	Total securities available for sale	Recurring		$	129,983			$	1,905			$	128,078			$	—
	Impaired loans	Non-recurring		$	6,887			$	—			$	—			$	6,887
	Foreclosed assets held for resale	Non-recurring		$	413			$	—			$	—			$	413
				Fair Value Measurements at December 31, 2012
	In thousands	Basis		Total				Level 1				Level 2				Level 3
	U.S. Government and agencies			$	24,241			$	—			$	24,241			$	—
	Mortgage-backed securities, residential			80,583				—				80,583				—
	State and municipal			51,804				—				51,804				—
	Corporate bonds			7,286				—				7,286				—
	CRA mutual fund			1,096				1,096				—				—
	Stock in other banks			780				780				—				—
	Total securities available for sale	Recurring		$	165,790			$	1,876			$	163,914			$	—
	Impaired loans	Non-recurring		$	2,415			$	—			$	—			$	2,415
	Foreclosed assets held for resale	Non-recurring		$	2,338			$	—			$	—			$	2,338
	The following table presents additional quantitative information about assets measured at fair value on a nonrecurring basis for which the Corporation has utilized Level 3 inputs to determine fair value:
			Quantitative Information about Level 3 Fair Value Measurements
	Dollars in thousands		Fair Value Estimate				Valuation Technique		Unobservable Input			Range		Weighted Average
	31-Dec-13
	Impaired loans		$	6,887			Appraisal of collateral	-1	Appraisal adjustments	-2		(10) - (50)%		(19	)%
	Foreclosed assets held for resale		$	413			Appraisal of collateral	(1) (3)	Appraisal adjustments	-2		(10) - (50)%		(35	)%
	31-Dec-12
	Impaired loans		$	2,415			Appraisal of collateral	-1	Appraisal adjustments	-2		(10) - (50)%		(16	)%
	Foreclosed assets held for resale		$	2,338			Appraisal of collateral	(1) (3)	Appraisal adjustments	-2		(10) - (50)%		(40	)%
	-1	Fair value is generally determined through independent third-party appraisals of the underlying collateral, which generally includes various Level 3 inputs which are not observable.
	-2	Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range of liquidation expenses and other appraisal adjustments are presented as a percentage of the appraisal. Higher downward adjustments are caused by negative changes to the collateral or conditions in the real estate market, actual offers or sales contracts received, or age of the appraisal.
	-3	Includes qualitative adjustments by management and estimated liquidation expenses.
	The following information should not be interpreted as an estimate of the fair value of the entire Corporation since a fair value calculation is only provided for a limited portion of the Corporation’s assets and liabilities. Due to a wide range of valuation techniques and the degree of subjectivity used in making the estimates, comparisons between the Corporation’s disclosures and those of other companies may not be meaningful. The following methods and assumptions were used to estimate the fair values of certain Corporation assets and liabilities at December 31, 2013 and 2012:
	Cash and Cash Equivalents (Carried at Cost)
	The carrying amounts reported in the consolidated statement of condition for cash and short-term instruments approximate those assets’ fair value. U.S. currency is Level 1 and cash equivalents are Level 2.
	Securities
	The fair values of securities available for sale (carried at fair value) and held to maturity (carried at amortized cost) are determined by obtaining quoted market prices on nationally recognized securities exchanges (Level 1), or matrix pricing (Level 2), which is a mathematical technique used widely in the industry to value debt securities without relying exclusively on quoted market prices for the specific security but rather by relying on the security’s relationship to other benchmark quoted prices. The Corporation uses an independent service provider to provide matrix pricing, and uses the valuation of another provider to compare for reasonableness.
	Loans Held for Sale (Carried at Lower of Cost or Fair Value)
	The fair values of mortgage loans held for sale are determined based on amounts to be received at settlement by establishing the respective buyer requirement or market interest rates.
	Loans (Carried at Cost)
	The fair values of loans are estimated using discounted cash flow analyses, as well as using market rates at the balance sheet date that reflect the credit and interest rate risk inherent in the loans. Projected future cash flows are calculated based upon contractual maturity or call dates, projected repayments, and prepayments of principal. Generally, for variable rate loans that reprice frequently and with no significant change in credit risk, fair values are based on carrying values.
	Impaired Loans (Generally Carried at Fair Value)
	Loans for which the Corporation has measured impairment are generally based on the fair value of the loan’s collateral. Fair value is generally determined based upon independent third-party appraisals of the properties, or discounted cash flows based upon the expected proceeds. These assets are included as Level 3 fair values, based upon the lowest level of input that is significant to the fair value measurements. The fair value consists of the loan balances less the valuation allowance and/or charge-offs.
	Foreclosed Assets Held for Resale
	The fair value of real estate acquired through foreclosure is based on independent third-party appraisals of the properties. These assets are included as Level 3 fair values, based upon appraisals that consider the sales prices of similar properties in the proximate vicinity.
	It is the policy of the Corporation to have the initial market value of a foreclosed asset held for resale determined by an independent third party valuation. If the Corporation already has a valid appraisal on file for the property and that appraisal has been completed within the previous 12 months, another appraisal shall not be required when the Corporation acquires ownership of that real estate. Further, the Corporation shall update the market value of each foreclosed asset with an independent third party valuation at least every 18 months, or more frequently if management believes that there is an indication that the fair value has declined. These valuations may be adjusted downward to account for specialized use of the property, change in the condition of the real estate, change in local market and economic conditions, and other specific factors involving the collateral.
	Restricted Investment in Bank Stock (Carried at Cost)
	The carrying amount of required and restricted investment in correspondent bank stock approximates fair value, and considers the limited marketability of such securities.
	Accrued Interest Receivable and Payable (Carried at Cost)
	The carrying amounts of accrued interest receivable and accrued interest payable approximate their fair value.
Deposits (Carried at Cost)
The fair values disclosed for demand deposits (e.g., interest and non-interest checking, savings, and money market accounts) are, by definition, equal to the amount payable on demand at the reporting date (e.g., their carrying amounts). Fair values for fixed-rate certificates of deposit are estimated using a discounted cash flow calculation that applies market interest rates currently being offered in the market on certificates to a schedule of aggregated expected monthly maturities on time deposits.
Short-Term Borrowings (Carried at Cost)
The carrying amounts of short-term borrowings approximate their fair values.
Long-Term Borrowings (Carried at Cost)
The fair values of Federal Home Loan Bank (FHLB) advances are estimated using discounted cash flow analysis, based on quoted prices for new FHLB advances with similar credit risk characteristics, terms, and remaining maturity. The prices obtained from this active market represent a market value that is deemed to represent the transfer price if the liability were assumed by a third party.
Off-Balance Sheet Credit-Related Instruments
The fair values for the Corporation’s off-balance sheet financial instruments (lending commitments and letters of credit) are based on fees currently charged in the market to enter into similar agreements, taking into account the remaining terms of the agreements and the counterparties’ credit standing.
The following presents the carrying amount, fair value, and placement in the fair value hierarchy of the Corporation’s financial instruments at December 31, 2013 and 2012:
	31-Dec-13
In thousands	Carrying Amount				Fair Value				Level 1				Level 2				Level 3
Financial assets:
Cash and due from banks	$	13,963			$	13,963			$	7,755			$	6,208			$	—
Interest-bearing deposits in banks	4,153				4,153				4,153				—				—
Investment securities available for sale	129,983				129,983				1,905				128,078				—
Investment securities held to maturity	94,373				92,082				—				92,082				—
Loans held for sale	496				496				—				496				—
Loans, less allowance for loan losses	712,557				724,937				—				—				724,937
Accrued interest receivable	3,027				3,027				—				3,027				—
Restricted investment in bank stocks	6,861				6,861				—				6,861				—
Financial liabilities:
Deposits	800,643				801,063				—				801,063				—
Short-term borrowings	49,052				49,052				—				49,052				—
Long-term borrowings	82,703				84,558				—				84,558				—
Accrued interest payable	681				681				—				681				—
Off-balance sheet financial instruments	—				—				—				—				—
	31-Dec-12
In thousands	Carrying Amount				Fair Value				Level 1				Level 2				Level 3
Financial assets:
Cash and due from banks	$	19,078			$	19,078			$	5,832			$	13,246			$	—
Interest-bearing deposits in banks	32,307				32,307				32,307				—				—
Investment securities available for sale	165,790				165,790				1,876				163,914				—
Investment securities held to maturity	50,159				50,980				—				50,980				—
Loans held for sale	6,687				6,687				—				6,687				—
Loans, less allowance for loan losses	691,311				724,982				—				—				724,982
Accrued interest receivable	3,360				3,360				—				3,360				—
Restricted investment in bank stocks	5,318				5,318				—				5,318				—
Financial liabilities:
Deposits	834,176				835,640				—				835,640				—
Short-term borrowings	47,303				47,303				—				47,303				—
Long-term borrowings	59,954				62,296				—				62,296				—
Accrued interest payable	1,114				1,114				—				1,114				—
Off-balance sheet financial instruments	—				—				—				—				—

Retirement_Benefits

Retirement Benefits	12 Months Ended
	Dec. 31, 2013
Postemployment Benefits [Abstract]	'
RETIREMENT PLANS	'
	RETIREMENT PLANS
	The Corporation’s banking subsidiary has a non-contributory, defined benefit pension plan. Retirement benefits are a function of both years of service and compensation. The funding policy is to contribute annually the amount that is sufficient to meet the minimum funding requirements set forth in the Employee Retirement Income Security Act.
	A measurement date of December 31 has been used for the fiscal year ending December 31, 2013 and 2012.
	In thousands	2013				2012
	Change in benefit obligation:
	Benefit obligation at beginning of year	$	24,297			$	20,989
	Service cost	774				651
	Interest cost	894				925
	Actuarial (gain) loss	(2,725		)		2,590
	Benefits paid	(937		)		(858		)
	Benefit obligation at end of year	22,303				24,297
	Change in plan assets:
	Fair value of plan assets at beginning of year	29,418				25,451
	Actual return on plan assets	3,631				2,969
	Employer contribution	2,599				1,856
	Benefits paid	(937		)		(858		)
	Fair value of plan assets at end of year	34,711				29,418
	Funded Status, included in other assets	$	12,408			$	5,121
	Amounts recognized in accumulated other comprehensive income:
	Total net actuarial loss	$	3,667			$	8,719
	Prior service cost	65				105
	Total included in accumulated other comprehensive income (pretax)	$	3,732			$	8,824
	The estimated costs that will be amortized from accumulated other comprehensive income into net periodic pension cost during the next fiscal year are as follows:
	In thousands
	Net loss	$	22
	Prior service cost	40
		$	62
	The accumulated benefit obligation totaled $21,713,000 and $23,757,000 at December 31, 2013 and 2012, respectively.
	The components of net periodic benefit costs (income) related to the non-contributory, defined benefit pension plan for the years ended December 31 are as follows:
	In thousands	2013				2012				2011
	Components of net periodic benefit cost (income):
	Service cost	$	774			$	651			$	570
	Interest cost	894				925				962
	Expected return on plan assets	(1,957		)		(1,772		)		(1,829		)
	Recognized net actuarial loss	652				611				140
	Amortization of transition liability	—				10				12
	Amortization of prior service cost	40				40				40
	Net Periodic Benefit Cost (Income)	403				465				(105		)
	Net (gain) loss	(4,400		)		1,393				4,130
	Amortization of net loss	(652		)		(611		)		(140		)
	Amortization of transition liability	—				(10		)		(12		)
	Amortization of prior service cost	(40		)		(40		)		(40		)
	Total recognized in other comprehensive (income) loss	$	(5,092	)		$	732			$	3,938
	Total recognized in net periodic benefit cost (income) and other comprehensive (income) loss	$	(4,689	)		$	1,197			$	3,833
	For the years ended December 31, 2013, 2012 and 2011, the assumptions used to determine the benefit obligation are as follows:
		2013			2012			2011
	Discount rate	4.75	%		3.75	%		4.5	%
	Rate of compensation increase	3.75	%		3.75	%		4	%
	For the years ended December 31, 2013, 2012 and 2011, the assumptions used to determine the net periodic benefit cost (income) are as follows:
		2013			2012			2011
	Discount rate	3.75	%		4.5	%		5.5	%
	Expected long-term rate of return on plan assets	6.75	%		7	%		7.5	%
	Rate of compensation increase	3.75	%		4	%		3.58	%
	The Corporation’s pension plan weighted-average assets’ allocations at December 31, 2013 and 2012, are as follows:
		2013			2012
	Equity securities	46	%		45	%
	Debt securities	45	%		45	%
	Short-term fixed income	4	%		6	%
	Real estate	5	%		4	%
		100	%		100	%
	The Corporation’s overall investment strategy is to achieve a mix of investments to meet the long-term rate of return assumption and near-term pension obligations with a diversification of assets types, fund strategies and fund managers. The mix of investments is adjusted periodically by retaining an advisory firm to recommend appropriate allocations after reviewing the Corporation’s risk tolerance on contribution levels, funded status and plan expense, and any applicable regulatory requirements. The weighted-average assets’ allocation in the above table represents the Corporation’s conclusion on the appropriate mix of investments. The specific investment vehicles are institutional separate accounts from a variety of fund managers which are regularly reviewed by the Corporation for acceptable performance.
	Equity securities included Corporation common stock in amounts of $1,128,000, or 3% of total plan assets, and $967,000, or 3% of total plan assets, at December 31, 2013 and 2012, respectively.
	Fair value measurements at December 31, 2013, are as follows:
In thousands	Total				Level 1				Level 2			Level 3
Equity securities	$	17,385			$	1,128			$	16,257		$	—
Debt securities	15,754				—				15,754			—
Real estate	1,572				—				1,572			—
Fair value measurements at December 31, 2012, are as follows:
In thousands	Total				Level 1				Level 2			Level 3
Equity securities	$	14,951			$	967			$	13,984		$	—
Debt securities	13,155				—				13,155			—
Real estate	1,312				—				1,312			—
It has not yet been determined the amount that the Bank may contribute to the Plan in 2014. The Corporation reduced the future benefit accruals for the defined benefit pension plan effective January 1, 2010, in order to manage total benefit expense. The new formula is the earned benefit as of December 31, 2009, plus 0.75% of a participant’s average monthly pay multiplied by years of benefit service earned on and after January 1, 2010, but not more than 25 years. The benefit formula percentage and maximum years of benefit service were both reduced. Effective April 1, 2012, no inactive or former participant in the Plan is eligible to again participate in the plan, and no employee hired after March 31, 2012, is eligible to participate in the Plan. As of the last annual census, ACNB Bank had a combined 368 active, vested terminated, and retired persons in the Plan.
Based on current data and assumptions, the following benefit payments, which reflect expected future service, as appropriate, are:
Years Ending	In thousands
2014	$	1,020
2015	1,030
2016	1,070
2017	1,170
2018	1,260
2019 - 2023	7,570
The Corporation’s banking subsidiary maintains a 401(k) plan for the benefit of eligible employees. Employees may contribute up to 100% of their compensation subject to certain limits based on federal tax laws. The Bank makes matching contributions up to 100% of the first 4% of an employee’s compensation contributed to the plan. Matching contributions vest immediately to the employee. Bank contributions to and expenses for the plan were $500,000, $486,000 and $461,000 for 2013, 2012 and 2011, respectively.
The Corporation’s banking subsidiary maintains nonqualified compensation plans for selected senior officers. The estimated present value of future benefits is accrued over the period from the effective date of the agreements until the expected retirement dates of the individuals. The balance accrued for these plans included in other liabilities as of December 31, 2013 and 2012, totaled $1,744,000 and $1,545,000, respectively. The annual expense included in salaries and benefits expense totaled $321,000, $297,000 and $143,000 during the years ended December 31, 2013, 2012 and 2011, respectively. To fund the benefits under these plans, the Bank is the owner of single premium life insurance policies on participants in the nonqualified retirement plans. At December 31, 2013 and 2012, the cash surrender value of these policies was $4,616,000 and $4,494,000, respectively.

Regulatory_Matters

Regulatory Matters	12 Months Ended
	Dec. 31, 2013
Regulatory Capital Requirements [Abstract]	'
REGULATORY MATTERS	'
	REGULATORY MATTERS
	The Corporation and the Bank are subject to various regulatory capital requirements administered by the federal banking regulators. Failure to meet the minimum capital requirements can initiate certain mandatory and possibly additional discretionary actions by regulators that, if undertaken, could have a direct material effect on the Corporation’s consolidated financial statements. Under capital adequacy guidelines and the regulatory framework for prompt corrective action, the Corporation and the Bank must meet specific capital guidelines that involve quantitative measures of their assets, liabilities and certain off-balance sheet items as calculated under regulatory accounting practices. The capital amounts and classification are also subject to qualitative judgments by the regulators about components, risk weightings, and other factors.
	Quantitative measures established by regulation to ensure capital adequacy require the Corporation and the Bank to maintain minimum amounts and ratios (set forth below) of Tier 1 capital to average assets and of Tier 1 and total capital (as defined in the regulations) to risk weighted assets. Management believes, as of December 31, 2013, that the Corporation and the Bank meet all capital adequacy requirements to which they are subject.
	As of December 31, 2013, the most recent notification from the federal banking regulators categorized the Bank as “well capitalized” under the regulatory framework for prompt corrective action. There are no conditions or events since that notification that management believes have changed the Bank’s category.
	On May 5, 2009, stockholders approved and ratified the ACNB Corporation 2009 Restricted Stock Plan, which awards shall not exceed, in the aggregate, 200,000 shares of common stock. As of December 31, 2013, no shares have been issued under the plan. In January 2011, the Corporation offered stockholders the opportunity to participate in the ACNB Corporation Dividend Reinvestment and Stock Purchase Plan. The plan allows registered stockholders who have a minimal number of shares to participate and also provides for voluntary cash purchases of ACNB Corporation common stock. During 2013, 2012, and 2011, 25,943, 19,559, and 17,466 shares of common stock, respectively, were issued within the plan.
	The actual and required capital amounts and ratios were as follows:
		Actual				For Capital Adequacy		To be Well
						Purposes		Capitalized
								under Prompt
								Corrective Action
								Provisions
	Dollars in thousands	Amount		Ratio		Amount	Ratio	Amount	Ratio
	CORPORATION
	As of December 31, 2013
	Tier 1 leverage ratio (to average assets)	$	98,704	9.54	%	$ ≥41,367	≥4.0%	N/A	N/A
	Tier 1 risk-based capital ratio (to risk-weighted assets)	98,704		14.09		≥28,014	≥4.0	N/A	N/A
	Total risk-based capital ratio (to risk-weighted assets)	107,623		15.37		≥56,027	≥8.0	N/A	N/A
	As of December 31, 2012
	Tier 1 leverage ratio (to average assets)	$	92,860	8.76	%	$ ≥42,424	≥4.0%	N/A	N/A
	Tier 1 risk-based capital ratio (to risk-weighted assets)	92,860		13.65		≥27,211	≥4.0	N/A	N/A
	Total risk-based capital ratio (to risk-weighted assets)	101,512		14.92		≥54,422	≥8.0	N/A	N/A
	BANK
	As of December 31, 2013
	Tier 1 leverage ratio (to average assets)	$	90,339	8.76	%	$ ≥41,240	≥4.0%	$ ≥51,550	≥5.0%
	Tier 1 risk-based capital ratio (to risk-weighted assets)	90,339		12.99		≥27,808	≥4.0	≥41,712	≥6.0
	Total risk-based capital ratio (to risk-weighted assets)	99,121		14.26		≥55,616	≥8.0	≥69,520	≥10.0
	As of December 31, 2012
	Tier 1 leverage ratio (to average assets)	$	86,288	8.14	%	$ ≥42,399	≥4.0%	$ ≥52,999	≥5.0%
	Tier 1 risk-based capital ratio (to risk-weighted assets)	86,288		12.8		≥26,959	≥4.0	≥40,439	≥6.0
	Total risk-based capital ratio (to risk-weighted assets)	94,840		14.07		≥53,919	≥8.0	≥67,398	≥10.0

Financial_Instruments_With_Off

Financial Instruments With Off-Balance Sheet Risk	12 Months Ended
	Dec. 31, 2013
Risks and Uncertainties [Abstract]	'
FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK	'
	FINANCIAL INSTRUMENTS WITH OFF-BALANCE SHEET RISK
	The Corporation is a party to financial instruments with off-balance sheet risk in the normal course of business to meet the financing needs of its customers. These financial instruments consist primarily of commitments to extend credit (typically mortgages and commercial loans) and, to a lesser extent, standby letters of credit. These instruments involve, to varying degrees, elements of credit and interest rate risk in excess of the amount recognized on the consolidated balance sheet.
	The Corporation’s exposure to credit loss in the event of nonperformance by the other party to the financial instrument for commitments to extend credit and standby letters of credit is represented by the contractual amount of those instruments. The Corporation uses the same credit policies in making commitments and conditional obligations as it does for on balance sheet instruments. The Corporation does not anticipate any material losses from these commitments.
	Commitments to extend credit, including commitments to grant loans and unfunded commitments under lines of credit, are agreements to lend to a customer as long as there is no violation of any condition established in the contract. Commitments generally have fixed expiration dates or other termination clauses and may require payment of a fee. Since many of the commitments are expected to expire without being drawn upon, the total commitment amounts do not necessarily represent future cash requirements. The Corporation evaluates each customer’s creditworthiness on a case-by-case basis. The amount of collateral obtained, if deemed necessary by the Corporation upon extensions of credit, is based on management’s credit evaluation of the customer. Collateral held varies but may include accounts receivable, inventory, property and equipment and income-producing commercial properties. On loans secured by real estate, the Corporation generally requires loan to value ratios of no greater than 80%.
	Standby letters of credit are conditional commitments issued by the Corporation to guarantee the performance of a customer to a third party. Those guarantees are primarily issued to support public and private borrowing arrangements and similar transactions. The terms of the letters of credit vary and may have renewal features. The credit risk involved in issuing letters of credit is essentially the same as that involved in extending loans to customers. The Corporation generally holds collateral and/or personal guarantees supporting those commitments for which collateral is deemed necessary. Management believes that the proceeds obtained through a liquidation of such collateral and the enforcement of guarantees would be sufficient to cover the maximum potential amount of future payments required under the corresponding guarantees. The current amount of the liability as of December 31, 2013 and 2012, for guarantees under standby letters of credit issued is not material.
	In June 2013, ACNB Corporation executed a guaranty for a note related to a $500,000 commercial line of credit from an unaffiliated local bank, with normal terms and conditions for such a line, for Russell Insurance Group, Inc., the borrower and a wholly-owned subsidiary of ACNB Corporation. The commercial line of credit is for general working capital needs should they arise by the borrower. No liability is recorded for the guarantor’s obligation as the guarantor would have full recourse from all assets of its wholly-owned subsidiary. No draws were taken on this commercial line of credit since its inception.
	The Corporation has not been required to perform on any financial guarantees, and has not incurred any losses on its commitments, during the past two years.
	A summary of the Corporation’s commitments at December 31 were as follows:
	In thousands	2013		2012
	Commitments to extend credit	$	156,135	$	145,421
	Standby letters of credit	4,176		4,772

Contingencies

Contingencies	12 Months Ended
	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]	'
CONTINGENCIES	'
	CONTINGENCIES
	The Corporation is subject to claims and lawsuits which arise primarily in the ordinary course of business. Based on information presently available and advice received from legal counsel representing the Corporation in connection with any such claims and lawsuits, it is the opinion of management that the disposition or ultimate determination of any such claims and lawsuits will not have a material adverse effect on the consolidated financial position, consolidated results of operations or liquidity of the Corporation.

ACNB_Corporation_Parent_Compan

ACNB Corporation (Parent Company Only) Financial Information	12 Months Ended
	Dec. 31, 2013
Condensed Financial Information of Parent Company Only Disclosure [Abstract]	'
ACNB CORPORATION (PARENT COMPANY ONLY) FINANCIAL INFORMATION	'
	ACNB CORPORATION (PARENT COMPANY ONLY) FINANCIAL INFORMATION
	STATEMENTS OF CONDITION
		December 31,
	In thousands	2013			2012
	ASSETS
	Cash	$	3,585		$	1,161
	Investment in banking subsidiary	90,294			85,975
	Investment in other subsidiaries	9,153			10,342
	Investments in low-income housing partnerships	2,427			3,334
	Securities and other assets	1,563			1,504
	Receivable from banking subsidiary	1,828			985
	Total Assets	$	108,850		$	103,301
	LIABILITIES AND STOCKHOLDERS’ EQUITY
	Long-term debt	$	1,703		$	1,954
	Other liabilities	345			83
	Stockholders’ equity	106,802			101,264
	Total Liabilities and Stockholders’ Equity	$	108,850		$	103,301
	STATEMENTS OF INCOME AND COMPREHENSIVE INCOME
		Years Ended December 31,
	In thousands	2013			2012			2011
	Dividends from banking subsidiary	$	4,781		$	4,762		$	4,689
	Other income	34			44			47
		4,815			4,806			4,736
	Expenses	817			591			494
		3,998			4,215			4,242
	Income tax benefit	944			736			709
		4,942			4,951			4,951
	Equity in undistributed earnings of subsidiaries	4,373			3,935			3,551
	Net Income	$	9,315		$	8,886		$	8,502
	Comprehensive Income	$	9,633		$	8,019		$	7,975
	STATEMENTS OF CASH FLOWS
		Years Ended December 31,
	In thousands	2013			2012			2011
	CASH FLOWS FROM OPERATING ACTIVITIES
	Net income	$	9,315		$	8,886		$	8,502
	Equity in undistributed earnings of subsidiaries	(4,373		)	(3,935		)	(3,551		)
	Increase in receivable from banking subsidiary	(843		)	(261		)	(350		)
	Other	695			671			45
	Net Cash Provided by Operating Activities	4,794			5,361			4,646
	CASH FLOWS FROM INVESTING ACTIVITIES
	Return of investment from subsidiary	1,500			—			—
	Proceeds from sale of low-income housing partnership	476			—			—
	Net Cash Provided by Investing Activities	1,976			—			—
	CASH FLOWS USED IN FINANCING ACTIVITIES
	Repayments on long-term debt	(251		)	(237		)	(308		)
	Proceeds from issuance of common stock	447			295			257
	Dividends paid	(4,542		)	(4,524		)	(4,512		)
	Net Cash Used in Financing Activities	(4,346		)	(4,466		)	(4,563		)
	Net Increase in Cash and Cash Equivalents	2,424			895			83
	CASH AND CASH EQUIVALENTS — BEGINNING	1,161			266			183
	CASH AND CASH EQUIVALENTS — ENDING	$	3,585		$	1,161		$	266

Acquisitions

Acquisitions	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
ACQUISITIONS	'
	ACQUISITIONS
	On January 5, 2005, ACNB Corporation completed the acquisition of Russell Insurance Group, Inc. (RIG) and RIG began to operate as a separate subsidiary of ACNB Corporation. In accordance with the terms of the acquisition, there was contingent consideration associated with this transaction of up to $3,000,000, payable in 2008 subject to performance criteria for the three-year period subsequent to the acquisition. Due to performance at a higher level than the performance criteria, the liability for this consideration was recorded at December 31, 2006, with a related increase in goodwill. Payment was made in the second quarter of 2008 after it was ascertained that the performance criteria had been met for the full three-year period; after which, the total aggregate purchase price was $8,663,000. In addition, on January 13, 2011, the Corporation entered into another three-year employment agreement with Frank C. Russell, Jr., President & Chief Executive Officer of RIG, effective as of January 1, 2011.
	In 2007, RIG acquired two additional books of business with an aggregate purchase price of $637,000. In 2008, RIG acquired an additional book of business with an aggregate purchase price of $1,165,000, all of which was classified as an intangible asset. Also, on December 31, 2008, RIG acquired Marks Insurance & Associates, Inc. with an aggregate purchase price of $1,853,000, of which $1,300,000 was recorded as an intangible asset and $553,000 was recorded as goodwill. The contingent consideration for both 2008 purchases was calculated based on 2011 results of operation. The contingent amount of $338,000 was recorded in December 2011 and is included in goodwill and the other liabilities section of the statement of condition, and was paid on January 13, 2012. The intangible assets (excluding goodwill) are being amortized over ten years on a straight line basis.
	In 2010, RIG acquired an additional book of business with an aggregate purchase price of $31,000, of which all was classified as an intangible asset.
	In 2013, RIG acquired an additional book of business with an aggregate purchase price of $77,000, of which all was classified as an intangible asset.
	The carrying value and accumulated amortization of the intangible assets (customer lists) as of December 31, 2013 and 2012, are as follows:
		2013				2012
	In thousands	Gross		Accumulated		Gross		Accumulated
		Carrying		Amortization		Carrying		Amortization
		Amount				Amount
	Amortized intangible assets	$	6,494	$	4,649	$	6,417	$	4,008
	Amortization of the intangible assets for the five years subsequent to December 31, 2013, is expected to be as follows:
	Years Ending	In thousands
	2014	$	649
	2015	326
	2016	326
	2017	308
	2018	223
	Thereafter	13

Segment_and_Related_Informatio

Segment and Related Information	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
SEGMENT AND RELATED INFORMATION	'
	SEGMENT AND RELATED INFORMATION
	RIG is managed separately from the banking segment, which includes the Bank and related financial services that the Corporation offers. RIG offers a broad range of property and casualty, life and health insurance to both commercial and individual clients.
	Segment information for 2013, 2012 and 2011 is as follows:
	In thousands	Banking		Insurance		Total
	2013
	Net interest income and other income from external customers	$	40,953	$	4,362	$	45,315
	Income before income taxes	11,337		513		11,850
	Total assets	1,035,597		10,450		1,046,047
	Capital expenditures	2,205		7		2,212
	2012
	Net interest income and other income from external customers	$	41,525	$	4,686	$	46,211
	Income before income taxes	10,628		577		11,205
	Total assets	1,038,262		11,733		1,049,995
	Capital expenditures	1,986		63		2,049
	2011
	Net interest income and other income from external customers	$	41,463	$	4,644	$	46,107
	Income before income taxes	9,951		705		10,656
	Total assets	992,252		12,571		1,004,823
	Capital expenditures	1,938		4		1,942
	QUARTERLY RESULTS OF OPERATIONS
	Selected quarterly information for the years ended December 31, 2013 and 2012, is as follows:
	Dollars in thousands, except per share data	First		Second		Third		Fourth
		Quarter		Quarter		Quarter		Quarter
	2013
	Interest income	$	9,666	$	9,356	$	9,220	$	9,359
	Interest expense	1,132		1,018		936		903
	Net interest income	8,534		8,338		8,284		8,456
	Provision for loan losses	650		500		150		150
	Net interest income after provision for loan losses	7,884		7,838		8,134		8,306
	Other income	2,945		3,140		2,847		2,771
	Other expenses and provision for income taxes	8,411		8,656		8,673		8,810
	Net income	$	2,418	$	2,322	$	2,308	$	2,267
	Basic earnings per share	$	0.41	$	0.38	$	0.39	$	0.38
	Dividends per share	$	0.19	$	0.19	$	0.19	$	0.19
	2012
	Interest income	$	10,271	$	10,163	$	10,067	$	9,938
	Interest expense	1,631		1,595		1,526		1,343
	Net interest income	8,640		8,568		8,541		8,595
	Provision for loan losses	1,125		1,125		1,125		1,300
	Net interest income after provision for loan losses	7,515		7,443		7,416		7,295
	Net gains on sales of securities	4		3		—		—
	Other income	2,812		3,062		2,972		3,014
	Other expenses and provision for income taxes	8,095		8,380		8,084		8,091
	Net income	$	2,236	$	2,128	$	2,304	$	2,218
	Basic earnings per share	$	0.38	$	0.35	$	0.39	$	0.37
	Dividends per share	$	0.19	$	0.19	$	0.19	$	0.19

Summary_of_Significant_Account1

Summary of Significant Accounting Policies (Policy)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Nature of Operations [Policy Text Block]	'
	Nature of Operations
	ACNB Corporation (the Corporation or ACNB), headquartered in Gettysburg, Pennsylvania, provides banking, insurance, and financial services to businesses and consumers through its wholly-owned subsidiaries, ACNB Bank (Bank) and Russell Insurance Group, Inc. (RIG). The Bank engages in full-service commercial and consumer banking and trust services through its nineteen retail banking locations in Adams, Cumberland and York Counties, Pennsylvania. There is also a loan production office situated in Franklin County, Pennsylvania.
	RIG is a full-service insurance agency, based in Westminster, Maryland. The agency offers a broad range of property and casualty, life, and health insurance to both commercial and individual clients. In 2008, due to an agency acquisition, a second location of RIG was established in Germantown, Maryland.
	The Corporation, along with seven other banks, entered into a joint venture to form BankersRe Insurance Group, SPC (formerly Pennbanks Insurance Co., SPC), an offshore reinsurance company. Each participating entity owned an insurance cell through which its premiums and losses from credit life, disability and accident insurance are funded. Each entity was responsible for the activity in its respective cell. The financial activity for the Corporation’s insurance cell is included in the consolidated financial statements and is not material to the consolidated financial statements. The segregated portfolio was novated to a third party during 2012.
	The Corporation’s primary source of revenue is interest income on loans and investment securities and fee income on its products and services. Expenses consist of interest expense on deposits and borrowed funds, provisions for loan losses, and other operating expenses.
Basis of Financial Statements [Policy Text Block]	'
	Basis of Financial Statements
	The consolidated financial statements have been prepared in accordance with accounting principles generally accepted in the United States of America (GAAP) and include the accounts of the Corporation and its wholly-owned subsidiaries. All significant intercompany transactions have been eliminated.
	Assets held by the Corporation’s Trust Department in an agency or fiduciary capacity for its customers are excluded from the consolidated financial statements since they do not constitute assets of the Corporation. Assets held by the Trust Department amounted to $151,000,000 and $141,000,000 at December 31, 2013 and 2012, respectively. Income from fiduciary activities is recognized on the cash method, which approximates the accrual method.
	Certain amounts previously reported have been reclassified, when necessary, to conform to the financial statement presentation for 2013. The reclassifications had no effect on net income or stockholders’ equity.
	The Corporation has evaluated events and transactions occurring subsequent to the balance sheet date of December 31, 2013, for items that should potentially be recognized or disclosed in the consolidated financial statements. The evaluation was conducted through the date these consolidated financial statements were issued.
Use of Estimates [Policy Text Block]	'
	Use of Estimates
	Financial statements prepared in accordance with GAAP require management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosures of contingencies at the date of the consolidated financial statements, and revenues and expenses during the reporting period. Actual results could differ from these estimates. Material estimates that are particularly susceptible to significant change in the near term relate to the determination of the allowance for loan losses, the valuation of deferred tax assets, the determination of other than temporary impairment on securities, and the potential impairment of goodwill.
Significant Group Concentrations of Credit Risk [Policy Text Block]	'
	Significant Group Concentrations of Credit Risk
	Most of the Corporation’s activities are with customers located within southcentral Pennsylvania and northern Maryland. Note C discusses the types of securities in which the Corporation invests. Note D discusses the types of lending in which the Corporation engages. Included in commercial real estate loans are loans made to lessors of non-residential dwellings that total $104,752,000, or 14.4%, of total loans at December 31, 2013. These borrowers are geographically disbursed throughout ACNB’s marketplace and are leasing commercial properties to a varied group of tenants including medical offices, retail space and recreational facilities. Because of the varied nature of the tenants in aggregate, management believes that these loans do not present any greater risk than commercial loans in general.
Cash and Cash Equivalents [Policy Text Block]	'
	Cash and Cash Equivalents
	For purposes of the consolidated statements of cash flows, cash and cash equivalents include cash on hand, balances due from banks, and federal funds sold, all of which mature within 90 days.
Securities [Policy Text Block]	'
	Securities
	Debt securities that management has the positive intent and ability to hold to maturity are classified as “held to maturity” and recorded at amortized cost. Securities not classified as held to maturity or trading, including equity securities with readily determinable fair values, are classified as “available for sale” and recorded at fair value, with unrealized gains and losses excluded from earnings and reported, net of tax, in other comprehensive income (loss).
	Purchase premiums and discounts are recognized in interest income using the interest method over the terms of the securities. Declines in the fair value of held to maturity and available for sale securities below their cost that are deemed to be other than temporary are reflected in earnings as realized losses. In estimating other-than-temporary impairment losses on debt securities, management considers (1) whether management intends to sell the security, or (2) if it is more likely than not that management will be required to sell the security before recovery, or (3) if management does not expect to recover the entire amortized cost basis. In assessing potential other-than-temporary impairment for equity securities, consideration is given to management’s intention and ability to hold the securities until recovery of unrealized losses. Gains and losses on the sale of securities are recorded on the trade date and are determined using the specific identification method.
Restricted Investment in Bank Stocks [Policy Text Block]	'
	Restricted Investment in Bank Stocks
	Restricted investment in bank stocks, which represents required investments in the common stock of correspondent banks, is carried at cost as of December 31, 2013 and 2012, and consists of common stock in the Atlantic Central Bankers Bank and Federal Home Loan Bank (FHLB).
	Management evaluates the restricted investment in bank stocks for impairment in accordance with Accounting Standard Codification (ASC) Topic 942, Financial Services—Depository and Lending. Management’s determination of whether these investments are impaired is based on their assessment of the ultimate recoverability of their cost rather than by recognizing temporary declines in value. The determination of whether a decline affects the ultimate recoverability of their cost is influenced by criteria such as (1) the significance of the decline in net assets of the correspondent bank as compared to the capital stock amount for the correspondent bank and the length of time this situation has persisted, (2) commitments by the correspondent bank to make payments required by law or regulation and the level of such payments in relation to the operating performance of the correspondent bank, (3) the impact of legislative and regulatory changes on institutions and, accordingly, on the customer base of the correspondent bank, and (4) the liquidity position of the correspondent bank.
	Management believes no impairment charge was necessary related to the restricted investment in bank stocks during 2013, 2012 or 2011. However, security impairment analysis is completed quarterly, and the determination that no impairment has occurred during those years is no assurance that impairment may not occur in future periods.
Loans Held for Sale [Policy Text Block]	'
	Loans Held for Sale
	Loans originated and intended for sale in the secondary market are carried at the lower of aggregate cost or fair value, as determined by aggregate outstanding commitments from investors or current investor yield requirements. Net unrealized losses are recognized through a valuation allowance by charges to income.
	Mortgage loans held for sale are sold with the mortgage servicing rights released to another financial institution through a correspondent relationship. The correspondent financial institution absorbs all of the risk related to rate lock commitments. Gains or losses on sales of mortgage loans are recognized based on the difference between the selling price and the carrying value of the related mortgage loans sold.
Loans [Policy Text Block]	'
	Loans
	The Corporation grants commercial, residential, and consumer loans to customers. A substantial portion of the loan portfolio is represented by mortgage loans throughout southcentral Pennsylvania and northern Maryland. The ability of the Corporation’s debtors to honor their contracts is dependent upon the real estate and general economic conditions in this area.
	Loans that management has the intent and ability to hold for the foreseeable future or until maturity or pay-off generally are reported at their outstanding unpaid principal balances adjusted for charge-offs, the allowance for loan losses, and any deferred fees or costs on originated loans. Interest income is accrued on the unpaid principal balance. Loan origination fees, net of certain direct origination costs, are deferred and recognized as an adjustment of the related loan yield using the interest method.
	The loans receivable portfolio is segmented into commercial, residential mortgage, home equity lines of credit, and consumer loans. Commercial loans consist of the following classes: commercial and industrial, commercial real estate, and commercial real estate construction.
	The accrual of interest on residential mortgage and commercial loans is discontinued at the time the loan is 90 days past due unless the credit is well-secured and in process of collection. Consumer loans (consisting of home equity lines of credit and consumer loan classes) are typically charged off no later than 120 days past due. Past due status is based on contractual terms of the loan. In all cases, loans are placed on nonaccrual or charged off at an earlier date if collection of principal or interest is considered doubtful.
	All interest accrued, but not collected, for loans that are placed on nonaccrual or charged off is reversed against interest income. The interest on these loans is accounted for on the cash-basis or cost-recovery method, until qualifying for return to accrual status. Loans are returned to accrual status when all the principal and interest amounts contractually due are brought current and future payments are reasonably assured.
Allowance for Credit Losses [Policy Text Block]	'
	Allowance for Credit Losses
	The allowance for credit losses consists of the allowance for loan losses and the reserve for unfunded lending commitments. The allowance for loan losses (the “allowance”) is established as losses and are estimated to occur through a provision for loan losses charged to earnings. Loan losses are charged against the allowance when management believes the uncollectibility of a loan balance is confirmed. Subsequent recoveries, if any, are credited to the allowance. The reserve for unfunded lending commitments represents management’s estimate of losses inherent in its unfunded loan commitments and is recorded in other liabilities on the consolidated statement of condition. The amount of the reserve for unfunded lending commitments is not material to the consolidated statements.
	The allowance for loan losses is evaluated on a regular basis by management and is based upon management’s periodic review of the collectibility of the loans in light of historical experience, the nature and volume of the loan portfolio, adverse situations that may affect the borrower’s ability to repay, estimated value of any underlying collateral, and prevailing economic conditions. This evaluation is inherently subjective as it requires estimates that are susceptible to significant revision as more information becomes available.
	The allowance consists of specific, general and unallocated components. The specific component relates to loans that are classified as either doubtful, substandard or special mention. For such loans that are also classified as impaired, an allowance is established when the discounted cash flows (or collateral value or observable market price) of the impaired loan is lower than the carrying value of that loan. The general component covers pools of loans by loan class including commercial loans not considered impaired, as well as smaller balance homogeneous loans, such as residential real estate, home equity, and other consumer loans. These pools of loans are evaluated for loss exposure based upon historical loss rates for each of these categories of loans, adjusted for qualitative factors. These qualitative risk factors include:
	•	lending policies and procedures, including underwriting standards and collection, charge-off and recovery practices;
	•	national, regional and local economic and business conditions, as well as the condition of various market segments, including the impact on the value of underlying collateral for collateral dependent loans;
	•	the nature and volume of the portfolio and terms of loans;
	•	the experience, ability and depth of lending management and staff;
	•	the volume and severity of past due, classified and nonaccrual loans, as well as other loan modifications; and,
	•	the existence and effect of any concentrations of credit and changes in the level of such concentrations.
	Each factor is assigned a value to reflect improving, stable or declining conditions based on management’s best judgment using relevant information available at the time of the evaluation. Adjustments to the factors are supported through documentation of changes in conditions in a narrative accompanying the allowance for loan loss calculation.
	The unallocated component of the allowance is maintained to cover uncertainties that could affect management’s estimate of probable losses. The unallocated component of the allowance reflects the margin of imprecision inherent in the underlying assumptions used in the methodologies for estimating specific and general losses in the portfolio. It covers risks that are inherently difficult to quantify including, but not limited to, collateral risk, information risk, and historical charge-off risk.
	A loan is considered impaired when, based on current information and events, it is probable that the Corporation will be unable to collect the scheduled payments of principal and/or interest when due according to the contractual terms of the loan agreement. Factors considered by management in determining impairment include payment status, collateral value, and the probability of collecting scheduled principal and/or interest payments when due. Loans that experience insignificant payment delays and payment shortfalls generally are not classified as impaired. Management determines the significance of payment delays and payment shortfalls on a case-by-case basis, taking into consideration all of the circumstances surrounding the loan and the borrower, including the length of the delay, the reasons for the delay, the borrower’s prior payment record, and the amount of the shortfall in relation to the principal and interest owed. Impairment is measured on a loan by loan basis for commercial and commercial construction loans by either the present value of expected future cash flows discounted at the loan’s effective interest rate, the loan’s obtainable market price, or the fair value of the collateral if the loan is collateral dependent.
	A specific allocation within the allowance for loan losses is established for an impaired loan if its carrying value exceeds its estimated fair value. The estimated fair values of the Corporation’s impaired loans are measured based on the estimated fair value of the loan’s collateral or the discounted cash flows method.
	It is the policy of the Corporation to order an updated valuation on all real estate secured loans when the loan becomes 90 days past due and there has not been an updated valuation completed within the previous 12 months. In addition, the Corporation orders third party valuations on all impaired real estate collateralized loans within 30 days of the loan being classified as impaired. Until the valuations are completed, the Corporation utilizes the most recent independent third party real estate valuation to estimate the need for a specific allocation to be assigned to the loan. These existing valuations are discounted downward to account for such things as the age of the existing collateral valuation, a change in the condition of the real estate, change in local market and economic conditions, and other specific factors involving the collateral. Once the updated valuation is completed, the collateral value is updated accordingly.
	For commercial and industrial loans secured by non-real estate collateral, such as accounts receivable, inventory and equipment, estimated fair values are determined based on the borrower’s financial statements, inventory reports, accounts receivable aging reports, equipment appraisals, or invoices. Indications of value from these sources are generally discounted based on the age of the financial information or the quality of the assets.
	The Corporation actively monitors the values of collateral as well as the age of the valuation of impaired loans. Management believes that the Corporation’s market area is not as volatile as other areas throughout the United States, therefore valuations are ordered at least every 18 months, or more frequently if management believes that there is an indication that the fair value has declined.
	For impaired loans secured by collateral other than real estate, the Corporation considers the net book value of the collateral, as recorded in the most recent financial statements of the borrower, and determines fair value based on estimates made by management.
	Large groups of smaller balance homogeneous loans are collectively evaluated for impairment. Accordingly, the Corporation does not separately identify individual consumer and residential loans for impairment disclosures, unless such loans are the subject of a troubled debt restructure.
	Loans whose terms are modified are classified as troubled debt restructured loans if the Corporation grants such borrowers concessions that it would not otherwise consider and it is deemed that those borrowers are experiencing financial difficulty. Concessions granted under a troubled debt restructuring generally involve a temporary reduction in interest rate, a below market interest rate given the risk associated with the loan, or an extension of a loan’s stated maturity date. Nonaccrual troubled debt restructurings may be restored to accrual status if principal and interest payments, under the modified terms, are current for a sustained period of time and, based on a well-documented credit evaluation of the borrower’s financial condition, there is reasonable assurance of repayment. Loans classified as troubled debt restructurings are generally designated as impaired.
	The allowance calculation methodology includes further segregation of loan classes into credit quality rating categories. The borrower’s overall financial condition, repayment sources, guarantors, and value of collateral, if appropriate, are generally evaluated annually for commercial loans or when credit deficiencies arise, such as delinquent loan payments.
	Credit quality risk ratings include regulatory classifications of special mention, substandard, doubtful and loss. Loans classified special mention have potential weaknesses that deserve management’s close attention. If uncorrected, the potential weaknesses may result in deterioration of the repayment prospects. Loans classified substandard have a well-defined weakness or weaknesses that jeopardize the liquidation of the debt. They include loans that are inadequately protected by the current sound net worth and paying capacity of the obligor or of the collateral pledged, if any. Loans classified doubtful have all the weaknesses inherent in loans classified substandard with the added characteristic that collection or liquidation in full, on the basis of current conditions and facts, is highly improbable. Loans classified as a loss are considered uncollectible and are charged to the allowance for loan losses. Loans not classified are rated pass.
	In addition, federal and state regulatory agencies, as an integral part of their examination process, periodically review the Corporation’s allowance for loan losses and may require the Corporation to recognize additions to the allowance based on their judgments about information available to them at the time of their examination, which may not be currently available to management. Based on management’s comprehensive analysis of the loan portfolio and economic conditions, management believes the current level of the allowance for loan losses is adequate.
	Commercial and Industrial Lending — The Corporation originates commercial and industrial loans primarily to businesses located in its primary market area and surrounding areas. These loans are used for various business purposes which include short-term loans and lines of credit to finance machinery and equipment purchases, inventory, and accounts receivable. Generally, the maximum term for loans extended on machinery and equipment is based on the projected useful life of such machinery and equipment. Most business lines of credit are written on demand and may be renewed annually.
	Commercial and industrial loans are generally secured with short-term assets; however, in many cases, additional collateral such as real estate is provided as additional security for the loan. Loan-to-value maximum values have been established by the Corporation and are specific to the type of collateral. Collateral values may be determined using invoices, inventory reports, accounts receivable aging reports, collateral appraisals, etc.
	In underwriting commercial and industrial loans, an analysis is performed to evaluate the borrower’s character and capacity to repay the loan, the adequacy of the borrower’s capital and collateral, as well as the conditions affecting the borrower. Evaluation of the borrower’s past, present and future cash flows is also an important aspect of the Corporation’s analysis.
	Commercial loans generally present a higher level of risk than other types of loans due primarily to the effect of general economic conditions.
	Commercial Real Estate Lending — The Corporation engages in commercial real estate lending in its primary market area and surrounding areas. The Corporation’s commercial loan portfolio is secured primarily by commercial retail space, office buildings, and hotels. Generally, commercial real estate loans have terms that do not exceed 20 years, have loan-to-value ratios of up to 80% of the appraised value of the property, and are typically secured by personal guarantees of the borrowers.
	In underwriting these loans, the Corporation performs a thorough analysis of the financial condition of the borrower, the borrower’s credit history, and the reliability and predictability of the cash flow generated by the property securing the loan. Appraisals on properties securing commercial real estate loans originated by the Corporation are performed by independent appraisers.
	Commercial real estate loans generally present a higher level of risk than other types of loans due primarily to the effect of general economic conditions and the complexities involved in valuing the underlying collateral.
	Commercial Real Estate Construction Lending — The Corporation engages in commercial real estate construction lending in its primary market area and surrounding areas. The Corporation’s commercial real estate construction lending consists of commercial and residential site development loans, as well as commercial building construction and residential housing construction loans.
	The Corporation’s commercial real estate construction loans are generally secured with the subject property. Terms of construction loans depend on the specifics of the project, such as estimated absorption rates, estimated time to complete, etc.
	In underwriting commercial real estate construction loans, the Corporation performs a thorough analysis of the financial condition of the borrower, the borrower’s credit history, and the reliability and predictability of the cash flow generated by the project using feasibility studies, market data, etc. Appraisals on properties securing commercial real estate construction loans originated by the Corporation are performed by independent appraisers.
	Commercial real estate construction loans generally present a higher level of risk than other types of loans due primarily to the effect of general economic conditions and the uncertainties surrounding total construction costs.
	Residential Mortgage Lending — One-to-four family residential mortgage loan originations, including home equity closed-end loans, are generated by the Corporation’s marketing efforts, its present customers, walk-in customers, and referrals. These loans originate primarily within the Corporation’s market area or with customers primarily from the market area.
	The Corporation offers fixed-rate and adjustable-rate mortgage loans with terms up to a maximum of 30 years for both permanent structures and those under construction. The Corporation’s one-to-four family residential mortgage originations are secured primarily by properties located in its primary market area and surrounding areas. The majority of the Corporation’s residential mortgage loans originate with a loan-to-value of 80% or less. Loans in excess of 80% are required to have private mortgage insurance.
	In underwriting one-to-four family residential real estate loans, the Corporation evaluates both the borrower’s ability to make monthly payments and the value of the property securing the loan. Properties securing real estate loans made by the Corporation are appraised by independent appraisers. The Corporation generally requires borrowers to obtain an attorney’s title opinion or title insurance, as well as fire and property insurance (including flood insurance, if necessary) in an amount not less than the amount of the loan. The Corporation has not engaged in subprime residential mortgage originations.
	Residential mortgage loans present a moderate level of risk due primarily to general economic conditions, as well as a currently weakened housing market.
	Home Equity Lines of Credit Lending — The Corporation originates home equity lines of credit primarily within the Corporation’s market area or with customers primarily from the market area. Home equity lines of credit are generated by the Corporation’s marketing efforts, its present customers, walk-in customers, and referrals.
	Home equity lines of credit are secured by the borrower’s primary residence with a maximum loan-to-value of 90% and a maximum term of 20 years. In underwriting home equity lines of credit, a thorough analysis of the borrower’s financial ability to repay the loan as agreed is performed. The ability to repay is determined by the borrower’s employment history, current financial condition, and credit background.
	Home equity lines of credit generally present a moderate level of risk due primarily to general economic conditions, as well as a continued weak housing market.
	Junior liens inherently have more credit risk by virtue of the fact that another financial institution may have a higher security position in the case of foreclosure liquidation of collateral to extinguish the debt. Generally, foreclosure actions could become more prevalent if the real estate market continues to be weak and property values deteriorate.
	Consumer Lending — The Corporation offers a variety of secured and unsecured consumer loans, including those for vehicles and mobile homes and loans secured by savings deposits. These loans originate primarily within the Corporation’s market area or with customers primarily from the market area.
	Consumer loan terms vary according to the type and value of collateral and the creditworthiness of the borrower. In underwriting consumer loans, a thorough analysis of the borrower’s financial ability to repay the loan as agreed is performed. The ability to repay shall be determined by the borrower’s employment history, current financial condition, and credit background.
	Consumer loans may entail greater credit risk than residential mortgage loans or home equity lines of credit, particularly in the case of consumer loans which are unsecured or are secured by rapidly depreciable assets such as automobiles or recreational equipment. In such cases, any repossessed collateral for a defaulted consumer loan may not provide an adequate source of repayment of the outstanding loan balance as a result of the greater likelihood of damage, loss or depreciation. In addition, consumer loan collections are dependent on the borrower’s continuing financial stability, and thus are more likely to be affected by adverse personal circumstances. Furthermore, the application of various federal and state laws, including bankruptcy and insolvency laws, may limit the amount which can be recovered on such loans.
Off-Balance Sheet Credit-Related Financial Instruments [Policy Text Block]	'
	Off-Balance Sheet Credit-Related Financial Instruments
	In the ordinary course of business, the Corporation has entered into commitments to extend credit, including commitments under commercial lines of credit, and standby letters of credit. Such financial instruments are recorded when they are funded.
Foreclosed Assets [Policy Text Block]	'
	Foreclosed Assets
	Assets acquired through, or in lieu of, loan foreclosure are held for sale and are initially recorded at fair value, less costs to sell at the date of foreclosure, establishing a new cost basis. Subsequent to foreclosure, valuations are periodically performed by management and the assets are adjusted to the fair value, less costs to sell as necessary. Revenue and expenses from operations and changes in the valuation allowance are included in net expenses from foreclosed assets.
Premises and Equipment [Policy Text Block]	'
	Premises and Equipment
	Land is carried at cost. Buildings, furniture, fixtures, equipment and leasehold improvements are carried at cost, less accumulated depreciation. Depreciation is computed principally by the straight-line method over the assets’ estimated useful lives. Maintenance and normal repairs are charged to expense when incurred while major additions and improvements are capitalized. Gains and losses on disposals are reflected in current operations. Amortization of leasehold improvements is computed by straight line over the shorter of the assets’ useful life or the related lease term.
Investments in Low-Income Housing Partnerships [Policy Text Block]	'
	Investments in Low-Income Housing Partnerships
	The Corporation’s investments in low-income housing partnerships are accounted for using the “equity method” prescribed by ASC Topic 323, Investments — Equity Method. In accordance with ASC Topic 740, Income Taxes, tax credits are recognized as they become available. Any residual loss is amortized as the tax credits are received.
Bank-Owned Life Insurance [Policy Text Block]	'
	Bank-Owned Life Insurance
	The Corporation’s banking subsidiary maintains nonqualified compensation plans for selected senior officers. To fund the benefits under these plans, the Bank is the owner of single premium life insurance policies on participants in the nonqualified retirement plans. Investment in bank-owned life insurance policies was used to finance the nonqualified compensation plans and provide tax-exempt income to the Corporation.
	ASC Topic 715, Compensation—Retirement Benefits, requires a liability to be recorded during the service period when a split-dollar life insurance agreement continues after participants’ employment or retirement. The required accrued liability is based on either the post-employment benefit cost for continuing life insurance or based on the future death benefit depending on the contractual terms of the underlying agreement. The Corporation’s liability is based on the post-employment benefit cost for continuing life insurance.
Transfers of Financial Assets [Policy Text Block]	'
	Transfers of Financial Assets
	Transfers of financial assets are accounted for as sales when control over the assets has been surrendered. Control over transferred assets is deemed to be surrendered when (1) the assets have been isolated from the Corporation, (2) the transferee obtains the right (free of conditions that constrain it from taking advantage of that right) to pledge or exchange the transferred assets, and (3) the Corporation does not maintain effective control over the transferred assets through an agreement to repurchase them before their maturity or the ability to unilaterally cause the holder to return specific assets.
Income Taxes [Policy Text Block]	'
	Income Taxes
	The Corporation accounts for income taxes in accordance with income tax accounting guidance ASC Topic 740, Income Taxes.
	Current income tax accounting guidance results in two components of income tax expense: current and deferred. Current income tax expense reflects taxes to be paid or refunded for the current period by applying the provisions of the enacted tax law to the taxable income or excess of deductions over revenues. The Corporation determines deferred income taxes using the liability (or balance sheet) method. Under this method, the net deferred tax asset or liability is based on the tax effects of the differences between the book and tax bases of assets and liabilities, and enacted changes in tax rates and laws are recognized in the period in which they occur.
	Deferred income tax expense results from changes in deferred tax assets and liabilities between periods. Deferred tax assets are reduced by a valuation allowance if, based on the weight of the evidence available, it is more likely than not that some portion or all of a deferred tax asset will not be realized.
	The Corporation accounts for uncertain tax positions if it is more likely than not, based on the technical merits, that the tax position will be realized or sustained upon examination. The term more-likely-than-not means a likelihood of more than 50%; the terms examined and upon examination also include resolution of the related appeals or litigation processes, if any. A tax position that meets the more-likely-than-not recognition threshold is initially and subsequently measured as the largest amount of tax benefit that has a greater than 50% likelihood of being realized upon settlement with a taxing authority that has full knowledge of all relevant information. The determination of whether or not a tax position has met the more-likely-than-not recognition threshold considers the facts, circumstances, and information available at the reporting date and is subject to management’s judgment.
	The Corporation recognizes interest and penalties on income taxes, if any, as a component of income tax expense.
Retirement Plan [Policy Text Block]	'
	Retirement Plan
	The compensation cost of an employee’s pension benefit is recognized on the projected unit credit method over the employee’s approximate service period. The aggregate cost method is utilized for funding purposes.
Net Income per Share [Policy Text Block]	'
	Net Income per Share
	The Corporation has a simple capital structure.
Advertising Costs [Policy Text Block]	'
	Advertising Costs
	Costs of advertising, which are included in marketing expenses, are expensed when incurred.
Intangible Assets [Policy Text Block]	'
	Intangible Assets
	The Corporation accounts for its acquisitions using the purchase accounting method required by ASC Topic 805, Business Combinations. Purchase accounting requires the total purchase price to be allocated to the estimated fair values of assets and liabilities acquired, including certain intangible assets that must be recognized. Generally, this results in a residual amount in excess of the net fair values, which is recorded as goodwill.
	ASC Topic 350, Intangibles—Goodwill and Other, requires that goodwill is not amortized to expense, but rather that it be assessed for impairment at least annually. If certain events occur which might indicate goodwill has been impaired, the goodwill is tested for impairment when such events occur. Impairment write-downs are charged to results of operations in the period in which the impairment is determined. During the quarter ended June 30, 2012, the Corporation changed its method of applying ASC 350, such that the annual goodwill impairment testing date was changed from December 31 to October 1. This new testing date is preferable in the circumstances, because it allowed the Corporation more time to accurately complete its impairment testing process in order to incorporate the results in the annual consolidated financial statements. The Corporation did not identify any impairment on its outstanding goodwill from its most recent testing, which was performed as of October 1, 2013. Other acquired intangible assets with finite lives, such as customer lists, are required to be amortized over the estimated lives. These intangibles are generally amortized using the straight line method over estimated useful lives of ten years.
Accumulated Other Comprehensive Income (Loss)	'
	Accumulated Other Comprehensive Income (Loss)
	The components of the accumulated other comprehensive income (loss), net of taxes, are as follows:
	In thousands	Unrealized		Pension			Accumulated
		Gains on		Liability			Other
		Securities					Comprehensive
							Income (Loss)
	BALANCE — DECEMBER 31, 2013	$	2,572	$	(2,466	)	$	106
	BALANCE — DECEMBER 31, 2012	$	5,614	$	(5,826	)	$	(212	)
Segment Reporting [Policy Text Block]	'
	Segment Reporting
	The Bank acts as an independent community financial services provider, which offers traditional banking and related financial services to individual, business, and government customers. Through its branch and automated teller machine networks, the Bank offers a full array of commercial and retail financial services, including the taking of time, savings, and demand deposits; the making of commercial, consumer, and mortgage loans; and the providing of other financial services. Management does not separately allocate expenses, including the cost of funding loan demand, between the commercial, retail and mortgage banking operations of the Bank. As such, discrete financial information for commercial, retail and mortgage banking operations is not available and segment reporting would not be meaningful. Please refer to Note S — “Segment and Related Information” for a discussion of insurance operations.

Summary_of_Significant_Account2

Summary of Significant Accounting Policies (Tables)	12 Months Ended
	Dec. 31, 2013
Accounting Policies [Abstract]	'
Schedule Of Components Of The Accumulated Other Comprehensive Income, Net Of Taxes [Table Text Block]	'
	The components of the accumulated other comprehensive income (loss), net of taxes, are as follows:
	In thousands	Unrealized		Pension			Accumulated
		Gains on		Liability			Other
		Securities					Comprehensive
							Income (Loss)
	BALANCE — DECEMBER 31, 2013	$	2,572	$	(2,466	)	$	106
	BALANCE — DECEMBER 31, 2012	$	5,614	$	(5,826	)	$	(212	)

Securities_Tables

Securities (Tables)	12 Months Ended
	Dec. 31, 2013
Investments, Debt and Equity Securities [Abstract]	'
Unrealized Gain (Loss) on Investments [Table Text Block]	'
	Amortized cost and fair value at December 31, 2013 and 2012, were as follows:
	In thousands	Amortized		Gross		Gross		Fair
		Cost		Unrealized		Unrealized		Value
				Gains		Losses
	SECURITIES AVAILABLE FOR SALE
	31-Dec-13
	U.S. Government and agencies	$	21,094	$	557	$	—	$	21,651
	Mortgage-backed securities, residential	51,541		2,322		123		53,740
	State and municipal	40,780		1,117		375		41,522
	Corporate bonds	11,004		192		31		11,165
	CRA mutual fund	1,044		—		11		1,033
	Stock in other banks	627		245		—		872
		$	126,090	$	4,433	$	540	$	129,983
	31-Dec-12
	U.S. Government and agencies	$	23,225	$	1,016	$	—	$	24,241
	Mortgage-backed securities, residential	75,816		4,767		—		80,583
	State and municipal	49,568		2,246		10		51,804
	Corporate bonds	7,008		286		8		7,286
	CRA mutual fund	1,044		52		—		1,096
	Stock in other banks	627		153		—		780
		$	157,288	$	8,520	$	18	$	165,790
	SECURITIES HELD TO MATURITY
	31-Dec-13
	U.S. Government and agencies	$	37,528	$	142	$	923	$	36,747
	Mortgage-backed securities, residential	56,845		40		1,550		55,335
		$	94,373	$	182	$	2,473	$	92,082
	31-Dec-12
	U.S. Government and agencies	$	30,115	$	536	$	6	$	30,645
	Mortgage-backed securities, residential	$	20,044	$	298	$	7	$	20,335
		$	50,159	$	834	$	13	$	50,980
Schedule of Unrealized Loss on Investments [Table Text Block]	'
	The following table shows the Corporation’s investments’ gross unrealized losses and fair value, aggregated by investment category and length of time that individual securities have been in a continuous unrealized loss position, at December 31, 2013 and 2012:
		Less than 12 Months				12 Months or More				Total
	In thousands	Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
		Value		Losses		Value		Losses		Value		Losses
	SECURITIES AVAILABLE FOR SALE
	December 31, 2013
	Mortgage-backed securities, residential	$	6,944	$	123	$	—	$	—	$	6,944	$	123
	State and municipal	11,107		340		1,070		35		12,177		375
	Corporate bonds	4,969		31		—		—		4,969		31
	CRA Mutual Fund	1,033		11		—		—		1,033		11
		$	24,053	$	505	$	1,070	$	35	$	25,123	$	540
	December 31, 2012
	State and municipal	$	1,975	$	10	$	—	$	—	$	1,975	$	10
	Corporate bond	992		8		—		—		992		8
		$	2,967	$	18	$	—	$	—	$	2,967	$	18
	SECURITIES HELD TO MATURITY
	December 31, 2013
	U.S. Government and agencies	$	22,710	$	812	$	2,889	$	111	$	25,599	$	923
	Mortgage-backed securities, residential	45,891		1,446		1,755		104		47,646		1,550
		$	68,601	$	2,258	$	4,644	$	215	$	73,245	$	2,473
	31-Dec-12
	U.S. Government and agencies	$	2,994	$	6	$	—	$	—	$	2,994	$	6
	Mortgage-backed security, residential	$	2,046	$	7	$	—	$	—	$	2,046	$	7
		$	5,040	$	13	$	—	$	—	$	5,040	$	13
Investments Classified by Contractual Maturity Date [Table Text Block]	'
	Amortized cost and fair value at December 31, 2013, by contractual maturity, where applicable, are shown below. Expected maturities will differ from contractual maturities because issuers may have the right to call or prepay with or without penalties.
		Available for Sale				Held to Maturity
	In thousands	Amortized		Fair		Amortized		Fair
		Cost		Value		Cost		Value
	1 year or less	$	5,824	$	5,908	$	10,006	$	10,147
	Over 1 year through 5 years	33,668		34,918		19,064		18,610
	Over 5 years through 10 years	30,408		30,474		8,458		7,990
	Over 10 years	2,978		3,038		—		—
	Mortgage-backed securities, residential	51,541		53,740		56,845		55,335
	CRA mutual fund	1,044		1,033		—		—
	Stock in other banks	627		872		—		—
		$	126,090	$	129,983	$	94,373	$	92,082

Loans_Tables

Loans (Tables)	12 Months Ended
	Dec. 31, 2013
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]	'
Classes Of The Loan Portfolio Summarized By The Aggregate Risk Rating [Table Text Block]	'
	The following tables present the classes of the loan portfolio summarized by the aggregate pass rating and the classified ratings of special mention, substandard and doubtful within the Corporation’s internal risk rating system as of December 31, 2013 and 2012:
	In thousands	Pass				Special				Substandard				Doubtful			Total
						Mention
	December 31, 2013
	Commercial and industrial	$	53,316			$	2,364			$	3,537			$	—		$	59,217
	Commercial real estate	193,162				29,655				16,369				—			239,186
	Commercial real estate construction	5,123				5,018				1,055				—			11,196
	Residential mortgage	344,847				2,551				3,611				—			351,009
	Home equity lines of credit	53,021				608				223				—			53,852
	Consumer	14,188				—				—				—			14,188
	Total	$	663,657			$	40,196			$	24,795			$	—		$	728,648
	December 31, 2012
	Commercial and industrial	$	44,072			$	2,491			$	2,441			$	—		$	49,004
	Commercial real estate	205,449				20,379				17,191				—			243,019
	Commercial real estate construction	7,354				9,820				1,980				—			19,154
	Residential mortgage	321,986				4,502				2,348				—			328,836
	Home equity lines of credit	51,096				1,776				258				—			53,130
	Consumer	14,993				—				—				—			14,993
	Total	$	644,950			$	38,968			$	24,218			$	—		$	708,136
Impaired Loans By Loan Portfolio Class [Table Text Block]	'
	The following table summarizes information relative to impaired loans by loan portfolio class as of December 31, 2013 and 2012:
		Impaired Loans with Allowance												Impaired Loans with
														No Allowance
	In thousands	Recorded				Unpaid				Related				Recorded			Unpaid
		Investment				Principal				Allowance				Investment			Principal
						Balance											Balance
	December 31, 2013
	Commercial and industrial	$	—			$	—			$	—			$	1,574		$	2,688
	Commercial real estate	—				—				—				11,197			11,758
	Commercial real estate construction	—				—				—				788			1,062
	Residential mortgage	1,478				1,478				201				675			712
	Total	$	1,478			$	1,478			$	201			$	14,234		$	16,220
	December 31, 2012
	Commercial and industrial	$	146			$	146			$	29			$	195		$	1,310
	Commercial real estate	237				276				7				8,772			9,216
	Commercial real estate construction	—				—				—				854			1,128
	Residential mortgage	—				—				—				938			1,263
	Total	$	383			$	422			$	36			$	10,759		$	12,917
Average Of Impaired Loans And Related Interest Income By Loan Portfolio Class [Table Text Block]	'
	The following table summarizes information in regards to average of impaired loans and related interest income by loan portfolio class:
		Impaired Loans with								Impaired Loans with
		Allowance								No Allowance
	In thousands	Average				Interest				Average				Interest
		Recorded				Income				Recorded				Income
		Investment								Investment
	December 31, 2013
	Commercial and industrial	$	58			$	—			$	466			$	—
	Commercial real estate	95				—				11,237				529
	Commercial real estate construction	—				—				3,558				209
	Residential mortgage	833				—				1,119				10
	Total	$	986			$	—			$	16,380			$	748
	December 31, 2012
	Commercial and industrial	$	431			$	—			$	223			$	—
	Commercial real estate	691				—				8,193				11
	Commercial real estate construction	336				—				1,242				—
	Residential mortgage	18				—				1,390				—
	Total	$	1,476			$	—			$	11,048			$	11
	December 31, 2011
	Commercial and industrial	$	1,019			$	—			$	349			$	—
	Commercial real estate	2,324				—				4,946				44
	Commercial real estate construction	—				—				3,463				—
	Residential mortgage	340				—				1,119				—
	Total	$	3,683			$	—			$	9,877			$	44
Nonaccrual Loans By Classes Of The Loan Portfolio [Table Text Block]	'
	The following table presents nonaccrual loans by loan portfolio class as of December 31, 2013 and 2012:
	In thousands	2013				2012
	Commercial and industrial	$	1,574			$	342
	Commercial real estate	4,363				4,514
	Commercial real estate construction	788				854
	Residential mortgage	1,848				617
	Total	$	8,573			$	6,327
Troubled Debt Restructurings [Table Text Block]	'
	The following table summarizes information relative to troubled debt restructurings by loan portfolio class at December 31, 2013 and 2012:
	In thousands	Pre-Modification				Post-Modification				Recorded Investment at period end
		Outstanding Recorded				Outstanding Recorded
		Investment				Investment
	December 31, 2013
	Nonaccruing troubled debt restructurings:
	Commercial and industrial	$	490			$	485			$	142
	Commercial real estate	1,021				1,021				634
	Commercial real estate construction	1,548				1,541				694
	Residential mortgage	566				566				566
	Total nonaccruing troubled debt restructurings	3,625				3,613				2,036
	Accruing troubled debt restructurings:
	Commercial real estate	7,118				7,170				6,834
	Residential mortgage	336				336				305
	Total accruing troubled debt restructurings	7,454				7,506				7,139
	Total Troubled Debt Restructurings	$	11,079			$	11,119			$	9,175
	December 31, 2012
	Nonaccruing troubled debt restructurings:
	Commercial and industrial	$	490			$	485			$	187
	Commercial real estate	1,304				1,304				953
	Commercial real estate construction	1,548				1,541				760
	Total nonaccruing troubled debt restructurings	$	3,342			$	3,330			$	1,900
	Accruing troubled debt restructurings:
	Commercial real estate	$	4,577			$	4,577			$	4,494
	Residential mortgage	336				336				321
	Total accruing troubled debt restructurings	4,913				4,913				4,815
	Total Troubled Debt Restructurings	$	8,255			$	8,243			$	6,715
Troubled Debt Restructurings Modified On Financing Receivables [Table Text Block]	'
	The following table summarizes loans whose terms have been modified resulting in troubled debt restructurings during the years ended December 31, 2013 and 2012:
	Dollars in thousands	Number of Contracts			Pre-Modification Outstanding Recorded Investment				Post-Modification Outstanding Recorded Investment				Recorded Investment at period end
	2013
	Troubled debt restructurings:
	Commercial real estate	1			$	2,541			$	2,593			$	2,542
	Residential mortgage	1			566				566				566
	2012
	Troubled debt restructurings:
	Commercial real estate	2			$	5,225			$	5,225			$	5,099
	Residential mortgage	1			336				336				321
Loan Portfolio Summarized By The Past Due Status [Table Text Block]	'
	The following table presents the classes of the loan portfolio summarized by the past due status as of December 31, 2013 and 2012:
	In thousands	30-59 Days				60-89 Days				>90 Days Past Due				Total Past Due			Current			Total Loans			Loans
		Past Due				Past Due														Receivable			Receivable
																							>90 Days and
																							Accruing
	December 31, 2013
	Commercial and industrial	$	55			$	13			$	152			$	220		$	58,997		$	59,217		$	3
	Commercial real estate	857				552				1,964				3,373			235,813			239,186			—
	Commercial real estate construction	—				—				788				788			10,408			11,196			—
	Residential mortgage	4,728				795				3,148				8,671			342,338			351,009			1,900
	Home equity lines of credit	260				36				14				310			53,542			53,852			14
	Consumer	22				15				9				46			14,142			14,188			9
	Total	$	5,922			$	1,411			$	6,075			$	13,408		$	715,240		$	728,648		$	1,926
	December 31, 2012
	Commercial and industrial	$	128			$	—			$	342			$	470		$	48,534		$	49,004		$	1
	Commercial real estate	757				1,569				1,502				3,828			239,191			243,019			6
	Commercial real estate construction	—				—				854				854			18,300			19,154			—
	Residential mortgage	4,197				2,425				1,339				7,961			320,875			328,836			721
	Home equity lines of credit	353				10				43				406			52,724			53,130			43
	Consumer	8				4				—				12			14,981			14,993			—
	Total	$	5,443			$	4,008			$	4,080			$	13,531		$	694,605		$	708,136		$	771
Allowance For Loan Losses And Recorded Investment In Financing Receivables [Table Text Block]	'
	The following table summarizes the allowance for loan losses and recorded investment in financing receivables:
	In thousands	Commercial				Commercial				Commercial				Residential			Home Equity			Consumer			Unallocated			Total
		and Industrial				Real Estate				Real Estate				Mortgage			Lines of Credit
										Construction
	December 31, 2013
	Allowance for loan losses
	Beginning balance- January 1, 2013	$	1,507			$	6,576			$	518			$	3,721		$	517		$	633		$	3,353		$	16,825
	Charge-offs	(178		)		(996		)		—				(1,062		)	—			(191		)	—			(2,427		)
	Recoveries	235				—				—				4			—			4			—			243
	Provisions	351				239				(271		)		1,350			20			501			(740		)	1,450
	Ending balance- December 31, 2013	$	1,915			$	5,819			$	247			$	4,013		$	537		$	947		$	2,613		$	16,091
	Ending balance: individually evaluated for impairment	$	—			$	—			$	—			$	201		$	—		$	—		$	—		$	201
	Ending balance: collectively evaluated for impairment	$	1,915			$	5,819			$	247			$	3,812		$	537		$	947		$	2,613		$	15,890
	Loans receivables
	Ending balance	$	59,217			$	239,186			$	11,196			$	351,009		$	53,852		$	14,188		$	—		$	728,648
	Ending balance: individually evaluated for impairment	$	1,574			$	11,197			$	788			$	2,153		$	—		$	—		$	—		$	15,712
	Ending balance: collectively evaluated for impairment	$	57,643			$	227,989			$	10,408			$	348,856		$	53,852		$	14,188		$	—		$	712,936
	December 31, 2012
	Allowance for loan losses
	Beginning balance- January 1, 2012	$	2,582			$	6,007			$	548			$	3,624		$	507		$	419		$	1,795		$	15,482
	Charge-offs	(2,180		)		(417		)		(538		)		(500		)	(51		)	(71		)	—			(3,757		)
	Recoveries	22				250				149				1			—			3			—			425
	Provisions	1,083				736				359				596			61			282			1,558			4,675
	Ending balance- December 31, 2012	$	1,507			$	6,576			$	518			$	3,721		$	517		$	633		$	3,353		$	16,825
	Ending balance: individually evaluated for impairment	$	29			$	7			$	—			$	—		$	—		$	—		$	—		$	36
	Ending balance: collectively evaluated for impairment	$	1,478			$	6,569			$	518			$	3,721		$	517		$	633		$	3,353		$	16,789
	Loans receivables
	Ending balance	$	49,004			$	243,019			$	19,154			$	328,836		$	53,130		$	14,993		$	—		$	708,136
	Ending balance: individually evaluated for impairment	$	341			$	9,009			$	854			$	938		$	—		$	—		$	—		$	11,142
	Ending balance: collectively evaluated for impairment	$	48,663			$	234,010			$	18,300			$	327,898		$	53,130		$	14,993		$	—		$	696,994
	In thousands	Commercial				Commercial				Commercial				Residential			Home Equity			Consumer			Unallocated			Total
		and Industrial				Real Estate				Real Estate				Mortgage			Lines of Credit
										Construction
	December 31, 2011
	Allowance for loan losses
	Beginning balance- January 1, 2011	$	2,074			$	6,346			$	1,154			$	3,108		$	341		$	520		$	1,709		$	15,252
	Charge-offs	(1,861		)		(1,308		)		(1,242		)		(750		)	(52		)	(30		)	—			(5,243		)
	Recoveries	34				—				—				2			—			2			—			38
	Provisions	2,335				969				636				1,264			218			(73		)	86			5,435
	Ending balance- December 31, 2011	$	2,582			$	6,007			$	548			$	3,624		$	507		$	419		$	1,795		$	15,482
	Ending balance: individually evaluated for impairment	$	1,085			$	43			$	—			$	53		$	—		$	—		$	—		$	1,181
	Ending balance: collectively evaluated for impairment	$	1,497			$	5,964			$	548			$	3,571		$	507		$	419		$	1,795		$	14,301
	Loans receivables
	Ending balance	$	56,145			$	236,017			$	22,757			$	311,266		$	52,532		$	15,751		$	—		$	694,468
	Ending balance: individually evaluated for impairment	$	2,219			$	6,612			$	2,614			$	1,401		$	—		$	—		$	—		$	12,846
	Ending balance: collectively evaluated for impairment	$	53,926			$	229,405			$	20,143			$	309,865		$	52,532		$	15,751		$	—		$	681,622

Premises_And_Equipment_Tables

Premises And Equipment (Tables)	12 Months Ended
	Dec. 31, 2013
Property, Plant and Equipment [Abstract]	'
Property, Plant and Equipment [Table Text Block]	'
	Premises and equipment at December 31 were as follows:
	In thousands	2013			2012
	Land	$	2,591		$	2,591
	Buildings and improvements	17,060			17,004
	Furniture and equipment	12,946			12,820
	Construction in process	1,959			13
		34,556			32,428
	Accumulated depreciation	(18,565		)	(17,297		)
		$	15,991		$	15,131

Deposits_Tables

Deposits (Tables)	12 Months Ended
	Dec. 31, 2013
Interest-bearing Deposit Liabilities [Abstract]	'
Schedule Of Deposits [Table Text Block]	'
	Deposits were comprised of the following as of December 31:
	In thousands	2013		2012
	Non-interest bearing demand	$	128,011	$	119,297
	Interest bearing demand	115,014		122,717
	Savings	321,818		320,454
	Time certificates of deposit less than $100,000	165,491		191,019
	Time certificates of deposit greater than $100,000	70,309		80,689
		$	800,643	$	834,176
Schedule Of Maturities Of Time Certificates Of Deposits [Table Text Block]	'
	Scheduled maturities of time certificates of deposit at December 31, 2013, were as follows:
	Years Ending	In thousands
	2014	$	152,255
	2015	34,252
	2016	41,156
	2017	4,162
	2018	3,975
		$	235,800

Lease_Commitments_Tables

Lease Commitments (Tables)	12 Months Ended
	Dec. 31, 2013
Leases [Abstract]	'
Future Minimum Rental Payments [Table Text Block]	'
	The following is a schedule by year of future minimum rental payments required under operating leases that have initial or remaining non-cancelable lease terms in excess of one year as of December 31:
	Years Ending	In thousands
	2014	$	413
	2015	343
	2016	230
	2017	86
	2018	86
	Later years	303
		$	1,461

Borrowings_Tables

Borrowings (Tables)	12 Months Ended
	Dec. 31, 2013
Debt Disclosure [Abstract]	'
Schedule of Short-term Debt [Table Text Block]	'
	Short-term borrowings and weighted-average interest rates at December 31 are as follows:
		2013						2012
	Dollars in thousands	Amount			Rate			Amount				Rate
	FHLB overnight advance	$	6,800		0.25	%		$	—			—	%
	Securities sold under repurchase agreements	42,252			0.12	%		47,303				0.14	%
		$	49,052		0.14	%		$	47,303			0.14	%
Offsetting Liabilities [Table Text Block]	'
	The following table presents the liabilities subject to an enforceable master netting arrangement or repurchase agreements as of December 31, 2013 and 2012:
														Gross Amounts Not Offset in the Statements of Condition
	Dollars in thousands		Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Statements of Condition				Net Amounts of Liabilities Presented in the Statements of Condition				Financial Instruments			Cash Collateral Pledged		Net Amount
	31-Dec-13
	Repurchase agreements
	Commercial customers and government entities	(a)	$	42,252		$	—			$	42,252			$	(42,252	)	$	—	$	—
	31-Dec-12
	Repurchase agreements
	Commercial customers and government entities	(a)	$	47,303		$	—			$	47,303			$	(47,303	)	$	—	$	—
	(a) As of December 31, 2013 and 2012, the fair value of securities pledged in connection with repurchase agreements was $60,823,000 and $56,392,000, respectively.
Schedule of Maturities of Long-term Debt [Table Text Block]	'
	A summary of long-term debt as of December 31 is as follows:
		2013						2012
	Dollars in thousands	Amount			Rate			Amount				Rate
	FHLB fixed-rate advances maturing:
	2013	$	—		—	%		$	14,000			2.55	%
	2014	29,000			1.51	%		14,000				2.73	%
	2015	21,000			2.5	%		15,000				3.25	%
	2016	15,000			2.19	%		9,000				2.56	%
	2017	6,000			3.76	%		4,000				4.86	%
	2018	10,000			2.48	%		2,000				5.11	%
	Loan payable to local bank	1,703			6.02	%		1,954				5.96	%
		$	82,703		3.08	%		$	59,954			3.86	%

Income_Taxes_Tables

Income Taxes (Tables)	12 Months Ended
	Dec. 31, 2013
Income Tax Disclosure [Abstract]	'
Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]	'
	The components of income tax expense for the years ended December 31, 2013, 2012 and 2011, are as follows:
	In thousands	2013			2012				2011
	Federal:
	Current	$	1,800		$	2,163			$	1,816
	Deferred	693			108				279
		2,493			2,271				2,095
	State:
	Current	42			48				59
		$	2,535		$	2,319			$	2,154
Schedule of Reconciliations of the Statutory Federal Income Tax [Table Text Block]	'
	Reconciliations of the statutory federal income tax at a rate of 34% to the income tax expense reported in the consolidated statements of income for the years ended December 31, 2013, 2012 and 2011, are as follows:
		Percentage of Income
		before Income Taxes
		2013		2012			2011
	Federal income tax at statutory rate	34	%	34	%		34	%
	State income taxes, net of federal benefit	0.2	%	0.2	%		0.4	%
	Tax-exempt income	(4.6	)%	(5.9	)%		(6.0	)%
	Earnings on investment in bank-owned life insurance	(2.8	)%	(3.0	)%		(3.1	)%
	Rehabilitation and low-income housing credits	(5.7	)%	(4.9	)%		(5.2	)%
	Other	0.3	%	0.3	%		0.1	%
		21.4	%	20.7	%		20.2	%
Components of Deferred Tax Assets and Liabilities [Table Text Block]	'
	Components of deferred tax assets and liabilities at December 31 were as follows:
	In thousands	2013			2012
	Deferred tax assets:
	Allowance for loan losses	$	5,471		$	5,721
	Accrued deferred compensation	806			726
	Pension	1,269			3,000
	Deferred loan fees	5			16
	Other-than-temporary impairment	178			178
	Low-income housing tax credit carryforward	287			195
	Nonaccrual interest	191			183
	Director deferred liability	419			351
	Other	387			468
		9,013			10,838
	Deferred tax liabilities:
	Available for sale securities	1,323			2,891
	Prepaid pension benefit cost	5,488			4,741
	Prepaid expenses	237			213
	Accumulated depreciation	358			558
	Goodwill/intangibles	677			649
		8,083			9,052
	Net Deferred Tax Asset	$	930		$	1,786

Fair_Value_Measurements_Tables

Fair Value Measurements (Tables)	12 Months Ended
	Dec. 31, 2013
Fair Value Disclosures [Abstract]	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Table Text Block]	'
	For assets measured at fair value, the fair value measurements by level within the fair value hierarchy, and the basis on measurement used at December 31, 2013 and 2012, are as follows:
				Fair Value Measurements at December 31, 2013
	In thousands	Basis		Total				Level 1				Level 2				Level 3
	U.S. Government and agencies			$	21,651			$	—			$	21,651			$	—
	Mortgage-backed securities, residential			53,740				—				53,740				—
	State and municipal			41,522				—				41,522				—
	Corporate bonds			11,165				—				11,165				—
	CRA mutual fund			1,033				1,033				—				—
	Stock in other banks			872				872				—				—
	Total securities available for sale	Recurring		$	129,983			$	1,905			$	128,078			$	—
	Impaired loans	Non-recurring		$	6,887			$	—			$	—			$	6,887
	Foreclosed assets held for resale	Non-recurring		$	413			$	—			$	—			$	413
				Fair Value Measurements at December 31, 2012
	In thousands	Basis		Total				Level 1				Level 2				Level 3
	U.S. Government and agencies			$	24,241			$	—			$	24,241			$	—
	Mortgage-backed securities, residential			80,583				—				80,583				—
	State and municipal			51,804				—				51,804				—
	Corporate bonds			7,286				—				7,286				—
	CRA mutual fund			1,096				1,096				—				—
	Stock in other banks			780				780				—				—
	Total securities available for sale	Recurring		$	165,790			$	1,876			$	163,914			$	—
	Impaired loans	Non-recurring		$	2,415			$	—			$	—			$	2,415
	Foreclosed assets held for resale	Non-recurring		$	2,338			$	—			$	—			$	2,338
Fair Value Inputs, Assets, Quantitative Information [Table Text Block]	'
	The following table presents additional quantitative information about assets measured at fair value on a nonrecurring basis for which the Corporation has utilized Level 3 inputs to determine fair value:
			Quantitative Information about Level 3 Fair Value Measurements
	Dollars in thousands		Fair Value Estimate				Valuation Technique		Unobservable Input			Range		Weighted Average
	31-Dec-13
	Impaired loans		$	6,887			Appraisal of collateral	-1	Appraisal adjustments	-2		(10) - (50)%		(19	)%
	Foreclosed assets held for resale		$	413			Appraisal of collateral	(1) (3)	Appraisal adjustments	-2		(10) - (50)%		(35	)%
	31-Dec-12
	Impaired loans		$	2,415			Appraisal of collateral	-1	Appraisal adjustments	-2		(10) - (50)%		(16	)%
	Foreclosed assets held for resale		$	2,338			Appraisal of collateral	(1) (3)	Appraisal adjustments	-2		(10) - (50)%		(40	)%
	-1	Fair value is generally determined through independent third-party appraisals of the underlying collateral, which generally includes various Level 3 inputs which are not observable.
	-2	Appraisals may be adjusted by management for qualitative factors such as economic conditions and estimated liquidation expenses. The range of liquidation expenses and other appraisal adjustments are presented as a percentage of the appraisal. Higher downward adjustments are caused by negative changes to the collateral or conditions in the real estate market, actual offers or sales contracts received, or age of the appraisal.
	-3	Includes qualitative adjustments by management and estimated liquidation expenses.
Fair Value, by Balance Sheet Grouping [Table Text Block]	'
	The following presents the carrying amount, fair value, and placement in the fair value hierarchy of the Corporation’s financial instruments at December 31, 2013 and 2012:
		31-Dec-13
	In thousands	Carrying Amount				Fair Value				Level 1				Level 2				Level 3
	Financial assets:
	Cash and due from banks	$	13,963			$	13,963			$	7,755			$	6,208			$	—
	Interest-bearing deposits in banks	4,153				4,153				4,153				—				—
	Investment securities available for sale	129,983				129,983				1,905				128,078				—
	Investment securities held to maturity	94,373				92,082				—				92,082				—
	Loans held for sale	496				496				—				496				—
	Loans, less allowance for loan losses	712,557				724,937				—				—				724,937
	Accrued interest receivable	3,027				3,027				—				3,027				—
	Restricted investment in bank stocks	6,861				6,861				—				6,861				—
	Financial liabilities:
	Deposits	800,643				801,063				—				801,063				—
	Short-term borrowings	49,052				49,052				—				49,052				—
	Long-term borrowings	82,703				84,558				—				84,558				—
	Accrued interest payable	681				681				—				681				—
	Off-balance sheet financial instruments	—				—				—				—				—
		31-Dec-12
	In thousands	Carrying Amount				Fair Value				Level 1				Level 2				Level 3
	Financial assets:
	Cash and due from banks	$	19,078			$	19,078			$	5,832			$	13,246			$	—
	Interest-bearing deposits in banks	32,307				32,307				32,307				—				—
	Investment securities available for sale	165,790				165,790				1,876				163,914				—
	Investment securities held to maturity	50,159				50,980				—				50,980				—
	Loans held for sale	6,687				6,687				—				6,687				—
	Loans, less allowance for loan losses	691,311				724,982				—				—				724,982
	Accrued interest receivable	3,360				3,360				—				3,360				—
	Restricted investment in bank stocks	5,318				5,318				—				5,318				—
	Financial liabilities:
	Deposits	834,176				835,640				—				835,640				—
	Short-term borrowings	47,303				47,303				—				47,303				—
	Long-term borrowings	59,954				62,296				—				62,296				—
	Accrued interest payable	1,114				1,114				—				1,114				—
	Off-balance sheet financial instruments	—				—				—				—				—

Retirement_Plans_Tables

Retirement Plans (Tables)	12 Months Ended
	Dec. 31, 2013
Postemployment Benefits [Abstract]	'
Schedule of Benefit Plan Funded Status [Table Text Block]	'
	A measurement date of December 31 has been used for the fiscal year ending December 31, 2013 and 2012.
	In thousands	2013				2012
	Change in benefit obligation:
	Benefit obligation at beginning of year	$	24,297			$	20,989
	Service cost	774				651
	Interest cost	894				925
	Actuarial (gain) loss	(2,725		)		2,590
	Benefits paid	(937		)		(858		)
	Benefit obligation at end of year	22,303				24,297
	Change in plan assets:
	Fair value of plan assets at beginning of year	29,418				25,451
	Actual return on plan assets	3,631				2,969
	Employer contribution	2,599				1,856
	Benefits paid	(937		)		(858		)
	Fair value of plan assets at end of year	34,711				29,418
	Funded Status, included in other assets	$	12,408			$	5,121
	Amounts recognized in accumulated other comprehensive income:
	Total net actuarial loss	$	3,667			$	8,719
	Prior service cost	65				105
	Total included in accumulated other comprehensive income (pretax)	$	3,732			$	8,824
Estimated Costs To Be Amortized From AOCI Into Net Periodic Pension Cost During The Next Fiscal Year [Table Text Block]	'
	The estimated costs that will be amortized from accumulated other comprehensive income into net periodic pension cost during the next fiscal year are as follows:
	In thousands
	Net loss	$	22
	Prior service cost	40
		$	62
Components Of Net Periodic Benefit Costs (Income) [Table Text Block]	'
	The components of net periodic benefit costs (income) related to the non-contributory, defined benefit pension plan for the years ended December 31 are as follows:
	In thousands	2013				2012				2011
	Components of net periodic benefit cost (income):
	Service cost	$	774			$	651			$	570
	Interest cost	894				925				962
	Expected return on plan assets	(1,957		)		(1,772		)		(1,829		)
	Recognized net actuarial loss	652				611				140
	Amortization of transition liability	—				10				12
	Amortization of prior service cost	40				40				40
	Net Periodic Benefit Cost (Income)	403				465				(105		)
	Net (gain) loss	(4,400		)		1,393				4,130
	Amortization of net loss	(652		)		(611		)		(140		)
	Amortization of transition liability	—				(10		)		(12		)
	Amortization of prior service cost	(40		)		(40		)		(40		)
	Total recognized in other comprehensive (income) loss	$	(5,092	)		$	732			$	3,938
	Total recognized in net periodic benefit cost (income) and other comprehensive (income) loss	$	(4,689	)		$	1,197			$	3,833
Assumptions Used To Determine The Benefit Obligation and Net Periodic Benefit Cost (Income) [Table Text Block]	'
	For the years ended December 31, 2013, 2012 and 2011, the assumptions used to determine the benefit obligation are as follows:
		2013			2012			2011
	Discount rate	4.75	%		3.75	%		4.5	%
	Rate of compensation increase	3.75	%		3.75	%		4	%
	For the years ended December 31, 2013, 2012 and 2011, the assumptions used to determine the net periodic benefit cost (income) are as follows:
		2013			2012			2011
	Discount rate	3.75	%		4.5	%		5.5	%
	Expected long-term rate of return on plan assets	6.75	%		7	%		7.5	%
	Rate of compensation increase	3.75	%		4	%		3.58	%
Pension Plan Weighted-Average Assets' Allocations [Table Text Block]	'
	The Corporation’s pension plan weighted-average assets’ allocations at December 31, 2013 and 2012, are as follows:
		2013			2012
	Equity securities	46	%		45	%
	Debt securities	45	%		45	%
	Short-term fixed income	4	%		6	%
	Real estate	5	%		4	%
		100	%		100	%
Fair Value Measurements [Table Text Block]	'
	Fair value measurements at December 31, 2013, are as follows:
	In thousands	Total				Level 1				Level 2			Level 3
	Equity securities	$	17,385			$	1,128			$	16,257		$	—
	Debt securities	15,754				—				15,754			—
	Real estate	1,572				—				1,572			—
	Fair value measurements at December 31, 2012, are as follows:
	In thousands	Total				Level 1				Level 2			Level 3
	Equity securities	$	14,951			$	967			$	13,984		$	—
	Debt securities	13,155				—				13,155			—
	Real estate	1,312				—				1,312			—
Future Benefit Payments [Table Text Block]	'
	Based on current data and assumptions, the following benefit payments, which reflect expected future service, as appropriate, are:
	Years Ending	In thousands
	2014	$	1,020
	2015	1,030
	2016	1,070
	2017	1,170
	2018	1,260
	2019 - 2023	7,570

Regulatory_Matters_Tables

Regulatory Matters (Tables)	12 Months Ended
	Dec. 31, 2013
Regulatory Capital Requirements [Abstract]	'
The Actual and Required Capital Amounts and Ratios [Table Text Block]	'
	The actual and required capital amounts and ratios were as follows:
		Actual				For Capital Adequacy		To be Well
						Purposes		Capitalized
								under Prompt
								Corrective Action
								Provisions
	Dollars in thousands	Amount		Ratio		Amount	Ratio	Amount	Ratio
	CORPORATION
	As of December 31, 2013
	Tier 1 leverage ratio (to average assets)	$	98,704	9.54	%	$ ≥41,367	≥4.0%	N/A	N/A
	Tier 1 risk-based capital ratio (to risk-weighted assets)	98,704		14.09		≥28,014	≥4.0	N/A	N/A
	Total risk-based capital ratio (to risk-weighted assets)	107,623		15.37		≥56,027	≥8.0	N/A	N/A
	As of December 31, 2012
	Tier 1 leverage ratio (to average assets)	$	92,860	8.76	%	$ ≥42,424	≥4.0%	N/A	N/A
	Tier 1 risk-based capital ratio (to risk-weighted assets)	92,860		13.65		≥27,211	≥4.0	N/A	N/A
	Total risk-based capital ratio (to risk-weighted assets)	101,512		14.92		≥54,422	≥8.0	N/A	N/A
	BANK
	As of December 31, 2013
	Tier 1 leverage ratio (to average assets)	$	90,339	8.76	%	$ ≥41,240	≥4.0%	$ ≥51,550	≥5.0%
	Tier 1 risk-based capital ratio (to risk-weighted assets)	90,339		12.99		≥27,808	≥4.0	≥41,712	≥6.0
	Total risk-based capital ratio (to risk-weighted assets)	99,121		14.26		≥55,616	≥8.0	≥69,520	≥10.0
	As of December 31, 2012
	Tier 1 leverage ratio (to average assets)	$	86,288	8.14	%	$ ≥42,399	≥4.0%	$ ≥52,999	≥5.0%
	Tier 1 risk-based capital ratio (to risk-weighted assets)	86,288		12.8		≥26,959	≥4.0	≥40,439	≥6.0
	Total risk-based capital ratio (to risk-weighted assets)	94,840		14.07		≥53,919	≥8.0	≥67,398	≥10.0

Financial_Instruments_With_Off1

Financial Instruments With Off-Balance Sheet Risk (Tables)	12 Months Ended
	Dec. 31, 2013
Risks and Uncertainties [Abstract]	'
Schedule of Fair Value, Off-balance Sheet Risks [Table Text Block]	'
	A summary of the Corporation’s commitments at December 31 were as follows:
	In thousands	2013		2012
	Commitments to extend credit	$	156,135	$	145,421
	Standby letters of credit	4,176		4,772

ACNB_Corporation_Parent_Compan1

ACNB Corporation (Parent Company Only) Financial Information (Tables)	12 Months Ended
	Dec. 31, 2013
Condensed Financial Information of Parent Company Only Disclosure [Abstract]	'
Statements of Condition [Table Text Block]	'
		December 31,
	In thousands	2013			2012
	ASSETS
	Cash	$	3,585		$	1,161
	Investment in banking subsidiary	90,294			85,975
	Investment in other subsidiaries	9,153			10,342
	Investments in low-income housing partnerships	2,427			3,334
	Securities and other assets	1,563			1,504
	Receivable from banking subsidiary	1,828			985
	Total Assets	$	108,850		$	103,301
	LIABILITIES AND STOCKHOLDERS’ EQUITY
	Long-term debt	$	1,703		$	1,954
	Other liabilities	345			83
	Stockholders’ equity	106,802			101,264
	Total Liabilities and Stockholders’ Equity	$	108,850		$	103,301
Statements of Income [Table Text Block]	'
		Years Ended December 31,
	In thousands	2013			2012			2011
	Dividends from banking subsidiary	$	4,781		$	4,762		$	4,689
	Other income	34			44			47
		4,815			4,806			4,736
	Expenses	817			591			494
		3,998			4,215			4,242
	Income tax benefit	944			736			709
		4,942			4,951			4,951
	Equity in undistributed earnings of subsidiaries	4,373			3,935			3,551
	Net Income	$	9,315		$	8,886		$	8,502
	Comprehensive Income	$	9,633		$	8,019		$	7,975
Statements of Cash Flows [Table Text Block]	'
		Years Ended December 31,
	In thousands	2013			2012			2011
	CASH FLOWS FROM OPERATING ACTIVITIES
	Net income	$	9,315		$	8,886		$	8,502
	Equity in undistributed earnings of subsidiaries	(4,373		)	(3,935		)	(3,551		)
	Increase in receivable from banking subsidiary	(843		)	(261		)	(350		)
	Other	695			671			45
	Net Cash Provided by Operating Activities	4,794			5,361			4,646
	CASH FLOWS FROM INVESTING ACTIVITIES
	Return of investment from subsidiary	1,500			—			—
	Proceeds from sale of low-income housing partnership	476			—			—
	Net Cash Provided by Investing Activities	1,976			—			—
	CASH FLOWS USED IN FINANCING ACTIVITIES
	Repayments on long-term debt	(251		)	(237		)	(308		)
	Proceeds from issuance of common stock	447			295			257
	Dividends paid	(4,542		)	(4,524		)	(4,512		)
	Net Cash Used in Financing Activities	(4,346		)	(4,466		)	(4,563		)
	Net Increase in Cash and Cash Equivalents	2,424			895			83
	CASH AND CASH EQUIVALENTS — BEGINNING	1,161			266			183
	CASH AND CASH EQUIVALENTS — ENDING	$	3,585		$	1,161		$	266

Acquisitions_Tables

Acquisitions (Tables)	12 Months Ended
	Dec. 31, 2013
Business Combinations [Abstract]	'
Carrying Value And Accumulated Amortization Of The Intangible Assets (Customer Lists) [Table Text Block]	'
	The carrying value and accumulated amortization of the intangible assets (customer lists) as of December 31, 2013 and 2012, are as follows:
		2013				2012
	In thousands	Gross		Accumulated		Gross		Accumulated
		Carrying		Amortization		Carrying		Amortization
		Amount				Amount
	Amortized intangible assets	$	6,494	$	4,649	$	6,417	$	4,008
Expected Amortization Expense [Table Text Block]	'
	Amortization of the intangible assets for the five years subsequent to December 31, 2013, is expected to be as follows:
	Years Ending	In thousands
	2014	$	649
	2015	326
	2016	326
	2017	308
	2018	223
	Thereafter	13

Segment_and_Related_Informatio1

Segment and Related Information (Tables)	12 Months Ended
	Dec. 31, 2013
Segment Reporting [Abstract]	'
Segment Information [Table Text Block]	'
	Segment information for 2013, 2012 and 2011 is as follows:
	In thousands	Banking		Insurance		Total
	2013
	Net interest income and other income from external customers	$	40,953	$	4,362	$	45,315
	Income before income taxes	11,337		513		11,850
	Total assets	1,035,597		10,450		1,046,047
	Capital expenditures	2,205		7		2,212
	2012
	Net interest income and other income from external customers	$	41,525	$	4,686	$	46,211
	Income before income taxes	10,628		577		11,205
	Total assets	1,038,262		11,733		1,049,995
	Capital expenditures	1,986		63		2,049
	2011
	Net interest income and other income from external customers	$	41,463	$	4,644	$	46,107
	Income before income taxes	9,951		705		10,656
	Total assets	992,252		12,571		1,004,823
	Capital expenditures	1,938		4		1,942
Selected Quarterly Data [Table Text Block]	'
	Selected quarterly information for the years ended December 31, 2013 and 2012, is as follows:
	Dollars in thousands, except per share data	First		Second		Third		Fourth
		Quarter		Quarter		Quarter		Quarter
	2013
	Interest income	$	9,666	$	9,356	$	9,220	$	9,359
	Interest expense	1,132		1,018		936		903
	Net interest income	8,534		8,338		8,284		8,456
	Provision for loan losses	650		500		150		150
	Net interest income after provision for loan losses	7,884		7,838		8,134		8,306
	Other income	2,945		3,140		2,847		2,771
	Other expenses and provision for income taxes	8,411		8,656		8,673		8,810
	Net income	$	2,418	$	2,322	$	2,308	$	2,267
	Basic earnings per share	$	0.41	$	0.38	$	0.39	$	0.38
	Dividends per share	$	0.19	$	0.19	$	0.19	$	0.19
	2012
	Interest income	$	10,271	$	10,163	$	10,067	$	9,938
	Interest expense	1,631		1,595		1,526		1,343
	Net interest income	8,640		8,568		8,541		8,595
	Provision for loan losses	1,125		1,125		1,125		1,300
	Net interest income after provision for loan losses	7,515		7,443		7,416		7,295
	Net gains on sales of securities	4		3		—		—
	Other income	2,812		3,062		2,972		3,014
	Other expenses and provision for income taxes	8,095		8,380		8,084		8,091
	Net income	$	2,236	$	2,128	$	2,304	$	2,218
	Basic earnings per share	$	0.38	$	0.35	$	0.39	$	0.37
	Dividends per share	$	0.19	$	0.19	$	0.19	$	0.19

Summary_of_Significant_Account3

Summary of Significant Accounting Policies (Schedule Of Components Of The Accumulated Other Comprehensive Income, Net Of Taxes) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Accounting Policies [Abstract]	'	'
Unrealized Gains on Securities	$2,572	$5,614
Pension Liability	-2,466	-5,826
Accumulated other comprehensive (loss) income	$106	($212)

Summary_of_Significant_Account4

Summary of Significant Accounting Policies (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Summary of Significant Accounting Policies [Line Items]	'	'	'
Assets Held-in-trust	$151,000,000	$141,000,000	'
Total Loans Receivable	728,648,000	708,136,000	694,468,000
Number of minimum months for corporation to order updated valuation	'18 months	'	'
Other Postretirement Benefit Expense	47,000	28,000	22,000
Weighted Average Number of Shares Outstanding, Basic	5,976,960	5,953,723	5,936,030
Credit Concentration Risk [Member]	'	'	'
Summary of Significant Accounting Policies [Line Items]	'	'	'
Total Loans Receivable	104,752,000	'	'
Concentration Risk, Percentage	14.40%	'	'
Residential Mortgage and Commercial Loans [Member]	'	'	'
Summary of Significant Accounting Policies [Line Items]	'	'	'
Threshold period past due to discontinue accrual interest on financing receivable	'90 days	'	'
Consumer [Member]	'	'	'
Summary of Significant Accounting Policies [Line Items]	'	'	'
Total Loans Receivable	14,188,000	14,993,000	15,751,000
Threshold period past due for charge off of financing receivable	'120 days	'	'
Commercial real estate [Member]	'	'	'
Summary of Significant Accounting Policies [Line Items]	'	'	'
Total Loans Receivable	$239,186,000	$243,019,000	$236,017,000
Threshold period past due for Corporation to order updated valuation on financing receivable	'90 days	'	'
Number of previous months with no updated valuation completed for Corporation to update validation	'12 months	'	'
Number of maximum days of loan being classified as impaired for Corporation to order third party valuation	'30 days	'	'
Residential Mortgage [Member]	'	'	'
Summary of Significant Accounting Policies [Line Items]	'	'	'
Loan-to-value ratio	0.8	'	'
Maximum [Member] | Commercial real estate [Member]	'	'	'
Summary of Significant Accounting Policies [Line Items]	'	'	'
Financing receivable term	'20 years	'	'
Loan-to-value ratio	0.8	'	'
Maximum [Member] | Residential Mortgage [Member]	'	'	'
Summary of Significant Accounting Policies [Line Items]	'	'	'
Financing receivable term	'30 years	'	'
Maximum [Member] | Home Equity Line of Credit [Member]	'	'	'
Summary of Significant Accounting Policies [Line Items]	'	'	'
Financing receivable term	'20 years	'	'
Loan-to-value ratio	0.9	'	'

Restrictions_On_Cash_and_Due_F1

Restrictions On Cash and Due From Banks (Narrative) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Restricted Cash and Investments [Abstract]	'	'
Compensating Balance, Amount	$1,673	$1,969
Average Compensating Balance Amount	$2,181	$2,327

Securities_Unrealized_Gain_Los

Securities (Unrealized Gain (Loss) on Investments) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Investments [Line Items]	'	'
Securities Available-for-sale, Amortized Cost	$126,090	$157,288
Securities Available-for-sale, Gross Unrealized Gains	4,433	8,520
Securities Available-for-sale, Gross Unrealized Losses	540	18
Securities Available-for-sale, Fair Value	129,983	165,790
Securities Held-to-maturity, Amortized Cost	94,373	50,159
Securities Held-to-maturity, Gross Unrealized Gains	182	834
Securities Held-to-maturity, Gross Unrealized Losses	2,473	13
Securities Held-to-maturity, Fair Value	92,082	50,980
U.S. Government and agencies [Member]	'	'
Schedule of Investments [Line Items]	'	'
Securities Available-for-sale, Amortized Cost	21,094	23,225
Securities Available-for-sale, Gross Unrealized Gains	557	1,016
Securities Available-for-sale, Fair Value	21,651	24,241
Securities Held-to-maturity, Amortized Cost	37,528	30,115
Securities Held-to-maturity, Gross Unrealized Gains	142	536
Securities Held-to-maturity, Gross Unrealized Losses	923	6
Securities Held-to-maturity, Fair Value	36,747	30,645
Mortgage-backed securities [Member]	'	'
Schedule of Investments [Line Items]	'	'
Securities Available-for-sale, Amortized Cost	51,541	75,816
Securities Available-for-sale, Gross Unrealized Gains	2,322	4,767
Securities Available-for-sale, Gross Unrealized Losses	123	0
Securities Available-for-sale, Fair Value	53,740	80,583
Securities Held-to-maturity, Amortized Cost	56,845	20,044
Securities Held-to-maturity, Gross Unrealized Gains	40	298
Securities Held-to-maturity, Gross Unrealized Losses	1,550	7
Securities Held-to-maturity, Fair Value	55,335	20,335
State and municipal [Member]	'	'
Schedule of Investments [Line Items]	'	'
Securities Available-for-sale, Amortized Cost	40,780	49,568
Securities Available-for-sale, Gross Unrealized Gains	1,117	2,246
Securities Available-for-sale, Gross Unrealized Losses	375	10
Securities Available-for-sale, Fair Value	41,522	51,804
Corporate bonds [Member]	'	'
Schedule of Investments [Line Items]	'	'
Securities Available-for-sale, Amortized Cost	11,004	7,008
Securities Available-for-sale, Gross Unrealized Gains	192	286
Securities Available-for-sale, Gross Unrealized Losses	31	8
Securities Available-for-sale, Fair Value	11,165	7,286
CRA mutual fund [Member]	'	'
Schedule of Investments [Line Items]	'	'
Securities Available-for-sale, Amortized Cost	1,044	1,044
Securities Available-for-sale, Gross Unrealized Gains	0	52
Securities Available-for-sale, Gross Unrealized Losses	11	'
Securities Available-for-sale, Fair Value	1,033	1,096
Stock in other banks [Member]	'	'
Schedule of Investments [Line Items]	'	'
Securities Available-for-sale, Amortized Cost	627	627
Securities Available-for-sale, Gross Unrealized Gains	245	153
Securities Available-for-sale, Fair Value	$872	$780

Securities_Schedule_of_Unreali

Securities (Schedule of Unrealized Loss on Investments) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Investments [Line Items]	'	'
Securities Available-for-sale, Less than 12 Months: Fair Value	$24,053	$2,967
Securities Available-for-sale, Less than 12 Months: Unrealized Losses	505	18
Securities Available-for-sale, 12 Months or More: Fair Value	1,070	'
Securities Available-for-sale, 12 Months or More: Unrealized Losses	35	'
Securities Available-for-sale, Total: Fair Value	25,123	2,967
Securities Available-for-sale, Total Unrealized Loss	540	18
Securities Held-to-maturity, Less than 12 Months: Fair Value	68,601	5,040
Securities Held-to-maturity, Less than 12 Months: Unrealized Losses	2,258	13
Securities Held-to-maturity, 12 Months or More, Fair Value	4,644	'
Securities Held-to-maturity, 12 Months or More, Unrealized Loss	215	'
Securities Held-to-maturity, Total: Fair Value	73,245	5,040
Securities Held-to-maturity, Total Unrecognized Losses	2,473	13
U.S. Government and agencies [Member]	'	'
Schedule of Investments [Line Items]	'	'
Securities Held-to-maturity, Less than 12 Months: Fair Value	22,710	2,994
Securities Held-to-maturity, Less than 12 Months: Unrealized Losses	812	6
Securities Held-to-maturity, 12 Months or More, Fair Value	2,889	'
Securities Held-to-maturity, 12 Months or More, Unrealized Loss	111	'
Securities Held-to-maturity, Total: Fair Value	25,599	2,994
Securities Held-to-maturity, Total Unrecognized Losses	923	6
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	17	'
Held-to-maturity, Securities in Unrealized Loss Positions, Unrealized Losses as Percentage of Amortized Cost	8.00%	'
Held-to-maturity, Number of Securities in Continuous Loss Positions for 12 Months or More	2	'
Mortgage-backed securities [Member]	'	'
Schedule of Investments [Line Items]	'	'
Securities Available-for-sale, Less than 12 Months: Fair Value	6,944	'
Securities Available-for-sale, Less than 12 Months: Unrealized Losses	123	'
Securities Available-for-sale, Total: Fair Value	6,944	'
Securities Available-for-sale, Total Unrealized Loss	123	0
Securities Held-to-maturity, Less than 12 Months: Fair Value	45,891	2,046
Securities Held-to-maturity, Less than 12 Months: Unrealized Losses	1,446	7
Securities Held-to-maturity, 12 Months or More, Fair Value	1,755	'
Securities Held-to-maturity, 12 Months or More, Unrealized Loss	104	'
Securities Held-to-maturity, Total: Fair Value	47,646	2,046
Securities Held-to-maturity, Total Unrecognized Losses	1,550	7
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	7	'
Available-for-sale, Securities in Unrealized Loss Positions, Unrealized Losses as Percentage of Amortized Cost	3.00%	'
Held-to-maturity, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	30	'
Held-to-maturity, Securities in Unrealized Loss Positions, Unrealized Losses as Percentage of Amortized Cost	8.00%	'
Held-to-maturity, Number of Securities in Continuous Loss Positions for 12 Months or More	1	'
State and municipal [Member]	'	'
Schedule of Investments [Line Items]	'	'
Securities Available-for-sale, Less than 12 Months: Fair Value	11,107	1,975
Securities Available-for-sale, Less than 12 Months: Unrealized Losses	340	10
Securities Available-for-sale, 12 Months or More: Fair Value	1,070	'
Securities Available-for-sale, 12 Months or More: Unrealized Losses	35	'
Securities Available-for-sale, Total: Fair Value	12,177	1,975
Securities Available-for-sale, Total Unrealized Loss	375	10
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	26	'
Available-for-sale, Securities in Unrealized Loss Positions, Unrealized Losses as Percentage of Amortized Cost	8.00%	'
Available-for-sale, Number of Securities in Continuous Loss Positions for 12 Months or More	3	'
Corporate bonds [Member]	'	'
Schedule of Investments [Line Items]	'	'
Securities Available-for-sale, Less than 12 Months: Fair Value	4,969	992
Securities Available-for-sale, Less than 12 Months: Unrealized Losses	31	8
Securities Available-for-sale, Total: Fair Value	4,969	992
Securities Available-for-sale, Total Unrealized Loss	31	8
Available-for-sale, Securities in Unrealized Loss Positions, Qualitative Disclosure, Number of Positions	1	'
Available-for-sale, Securities in Unrealized Loss Positions, Unrealized Losses as Percentage of Amortized Cost	1.00%	'
CRA mutual fund [Member]	'	'
Schedule of Investments [Line Items]	'	'
Securities Available-for-sale, Less than 12 Months: Fair Value	1,033	'
Securities Available-for-sale, Less than 12 Months: Unrealized Losses	11	'
Securities Available-for-sale, Total: Fair Value	1,033	'
Securities Available-for-sale, Total Unrealized Loss	$11	'
Available-for-sale, Securities in Unrealized Loss Positions, Unrealized Losses as Percentage of Amortized Cost	2.00%	'

Securities_Investments_Classif

Securities (Investments Classified by Contractual Maturity Date) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Schedule of Investments [Line Items]	'	'
Available for sale Securities, Amortized Cost, 1 year or less	$5,824	'
Available for sale Securities, Fair Value, 1 year or less	5,908	'
Available for sale Securities, Amortized Cost, Over 1 year through 5 years	33,668	'
Available for sale Securities, Fair Value, Over 1 year through 5 years	34,918	'
Available for sale Securities, Amortized Cost, Over 5 years through 10 years	30,408	'
Available for sale Securities, Fair Value, Over 5 years through 10 years	30,474	'
Available for sale Securities, Amortized Cost, Over 10 years	2,978	'
Available for sale Securities, Fair Value, Over 10 years	3,038	'
Available-for-sale Securities, Amortized Cost Basis	126,090	157,288
Securities Available-for-sale, Fair Value	129,983	165,790
Held-to-maturity Securities, Amortized Cost, 1 year or less	10,006	'
Held-to-maturity Securities, Fair Value, 1 year or less	10,147	'
Held-to-maturity Securities, Amortized Cost, Over 1 year through 5 years	19,064	'
Held-to-maturity Securities, Fair Value, Over 1 year through 5 years	18,610	'
Held-to-maturity Securities, Amortized Cost, Over 5 years through 10 years	8,458	'
Held-to-maturity Securities, Fair Value, Over 5 years through 10 years	7,990	'
Held-to-maturity Securities	94,373	50,159
Securities held to maturity, fair value	92,082	50,980
Mortgage-backed securities [Member]	'	'
Schedule of Investments [Line Items]	'	'
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	51,541	'
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	53,740	'
Available-for-sale Securities, Amortized Cost Basis	51,541	75,816
Securities Available-for-sale, Fair Value	53,740	80,583
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Net Carrying Amount	56,845	'
Held-to-maturity Securities, Debt Maturities, without Single Maturity Date, Fair Value	55,335	'
Held-to-maturity Securities	56,845	20,044
Securities held to maturity, fair value	55,335	20,335
CRA mutual fund [Member]	'	'
Schedule of Investments [Line Items]	'	'
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	1,044	'
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	1,033	'
Available-for-sale Securities, Amortized Cost Basis	1,044	1,044
Securities Available-for-sale, Fair Value	1,033	1,096
Stock in other banks [Member]	'	'
Schedule of Investments [Line Items]	'	'
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis	627	'
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value	872	'
Available-for-sale Securities, Amortized Cost Basis	627	627
Securities Available-for-sale, Fair Value	$872	$780

Securities_Narrative_Details

Securities (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Investments, Debt and Equity Securities [Abstract]	'	'	'
Available-for-sale Securities, Gross Realized Gains	$0	$7,000,000	$1,000,000
Available-for-sale Securities, Gross Realized Losses, Excluding Other than Temporary Impairments	0	0	0
Available-for-sale Securities Pledged as Collateral	$139,966,000	$147,923,000	'

Loans_Classes_Of_The_Loan_Port

Loans (Classes Of The Loan Portfolio Summarized By The Aggregate Risk Rating) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	$728,648	$708,136	$694,468
Commercial and industrial [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	59,217	49,004	56,145
Commercial real estate [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	239,186	243,019	236,017
Commercial real estate construction [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	11,196	19,154	22,757
Residential mortgage [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	351,009	328,836	311,266
Home equity lines of credit [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	53,852	53,130	52,532
Consumer [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	14,188	14,993	15,751
Pass [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	663,657	644,950	'
Pass [Member] | Commercial and industrial [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	53,316	44,072	'
Pass [Member] | Commercial real estate [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	193,162	205,449	'
Pass [Member] | Commercial real estate construction [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	5,123	7,354	'
Pass [Member] | Residential mortgage [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	344,847	321,986	'
Pass [Member] | Home equity lines of credit [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	53,021	51,096	'
Pass [Member] | Consumer [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	14,188	14,993	'
Special Mention [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	40,196	38,968	'
Special Mention [Member] | Commercial and industrial [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	2,364	2,491	'
Special Mention [Member] | Commercial real estate [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	29,655	20,379	'
Special Mention [Member] | Commercial real estate construction [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	5,018	9,820	'
Special Mention [Member] | Residential mortgage [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	2,551	4,502	'
Special Mention [Member] | Home equity lines of credit [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	608	1,776	'
Substandard [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	24,795	24,218	'
Substandard [Member] | Commercial and industrial [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	3,537	2,441	'
Substandard [Member] | Commercial real estate [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	16,369	17,191	'
Substandard [Member] | Commercial real estate construction [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	1,055	1,980	'
Substandard [Member] | Residential mortgage [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	3,611	2,348	'
Substandard [Member] | Home equity lines of credit [Member]	'	'	'
Accounts, Notes, Loans and Financing Receivable [Line Items]	'	'	'
Total Loans Receivable	$223	$258	'

Loans_Impaired_Loans_By_Loan_P

Loans (Impaired Loans By Loan Portfolio Class) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financing Receivable, Impaired [Line Items]	'	'
Impaired Loans with Allowance, Recorded Investment	$1,478	$383
Impaired Loans with Allowance, Unpaid Principal Balance	1,478	422
Impaired Loans with Allowance, Related Allowance	201	36
Impaired Loans with No Allowance, Recorded Investment	14,234	10,759
Impaired Loans with No Allowance, Unpaid Principal Balance	16,220	12,917
Commercial and industrial [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired Loans with Allowance, Recorded Investment	0	146
Impaired Loans with Allowance, Unpaid Principal Balance	0	146
Impaired Loans with Allowance, Related Allowance	0	29
Impaired Loans with No Allowance, Recorded Investment	1,574	195
Impaired Loans with No Allowance, Unpaid Principal Balance	2,688	1,310
Commercial real estate [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired Loans with Allowance, Recorded Investment	0	237
Impaired Loans with Allowance, Unpaid Principal Balance	0	276
Impaired Loans with Allowance, Related Allowance	0	7
Impaired Loans with No Allowance, Recorded Investment	11,197	8,772
Impaired Loans with No Allowance, Unpaid Principal Balance	11,758	9,216
Commercial real estate construction [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired Loans with Allowance, Recorded Investment	0	0
Impaired Loans with Allowance, Unpaid Principal Balance	0	0
Impaired Loans with Allowance, Related Allowance	0	0
Impaired Loans with No Allowance, Recorded Investment	788	854
Impaired Loans with No Allowance, Unpaid Principal Balance	1,062	1,128
Residential mortgage [Member]	'	'
Financing Receivable, Impaired [Line Items]	'	'
Impaired Loans with Allowance, Recorded Investment	1,478	0
Impaired Loans with Allowance, Unpaid Principal Balance	1,478	0
Impaired Loans with Allowance, Related Allowance	201	0
Impaired Loans with No Allowance, Recorded Investment	675	938
Impaired Loans with No Allowance, Unpaid Principal Balance	$712	$1,263

Loans_Average_Of_Impaired_Loan

Loans (Average Of Impaired Loans And Related Interest Income By Loan Portfolio Class) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Impaired [Line Items]	'	'	'
Impaired Loans with Allowance, Average Recorded Investment	$986	$1,476	$3,683
Impaired Loans with Allowance, Interest Income	0	0	0
Impaired Loans with No Allowance, Average Recorded Investment	16,380	11,048	9,877
Impaired Loans with No Allowance, Interest Income	748	11	44
Commercial and industrial [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Impaired Loans with Allowance, Average Recorded Investment	58	431	1,019
Impaired Loans with Allowance, Interest Income	0	0	0
Impaired Loans with No Allowance, Average Recorded Investment	466	223	349
Impaired Loans with No Allowance, Interest Income	0	0	0
Commercial real estate [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Impaired Loans with Allowance, Average Recorded Investment	95	691	2,324
Impaired Loans with Allowance, Interest Income	0	0	0
Impaired Loans with No Allowance, Average Recorded Investment	11,237	8,193	4,946
Impaired Loans with No Allowance, Interest Income	529	11	44
Commercial real estate construction [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Impaired Loans with Allowance, Average Recorded Investment	0	336	0
Impaired Loans with Allowance, Interest Income	0	0	0
Impaired Loans with No Allowance, Average Recorded Investment	3,558	1,242	3,463
Impaired Loans with No Allowance, Interest Income	209	0	0
Residential mortgage [Member]	'	'	'
Financing Receivable, Impaired [Line Items]	'	'	'
Impaired Loans with Allowance, Average Recorded Investment	833	18	340
Impaired Loans with Allowance, Interest Income	0	0	0
Impaired Loans with No Allowance, Average Recorded Investment	1,119	1,390	1,119
Impaired Loans with No Allowance, Interest Income	$10	$0	$0

Loans_Nonaccrual_Loans_By_Clas

Loans (Nonaccrual Loans By Classes Of The Loan Portfolio) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Financing Receivable, Recorded Investment, Nonaccrual Status	$8,573	$6,327
Commercial and industrial [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Financing Receivable, Recorded Investment, Nonaccrual Status	1,574	342
Commercial real estate [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Financing Receivable, Recorded Investment, Nonaccrual Status	4,363	4,514
Commercial real estate construction [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Financing Receivable, Recorded Investment, Nonaccrual Status	788	854
Residential mortgage [Member]	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'
Financing Receivable, Recorded Investment, Nonaccrual Status	$1,848	$617

Loans_Troubled_Debt_Restructur

Loans (Troubled Debt Restructurings Modified On Financing Receivables) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Financing Receivable, Modifications [Line Items]	'	'
Pre-Modification Outstanding Recorded Investment	$11,079	$8,255
Post-Modification Outstanding Recorded Investment	11,119	8,243
Recorded Investment at period end	9,175	6,715
Commercial real estate [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Pre-Modification Outstanding Recorded Investment	2,541	5,225
Post-Modification Outstanding Recorded Investment	2,593	5,225
Recorded Investment at period end	2,542	5,099
Residential mortgage [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Pre-Modification Outstanding Recorded Investment	566	336
Post-Modification Outstanding Recorded Investment	566	336
Recorded Investment at period end	566	321
Nonaccrual [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Pre-Modification Outstanding Recorded Investment	3,625	3,342
Post-Modification Outstanding Recorded Investment	3,613	3,330
Recorded Investment at period end	2,036	1,900
Nonaccrual [Member] | Commercial and industrial [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Pre-Modification Outstanding Recorded Investment	490	490
Post-Modification Outstanding Recorded Investment	485	485
Recorded Investment at period end	142	187
Nonaccrual [Member] | Commercial real estate [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Pre-Modification Outstanding Recorded Investment	1,021	1,304
Post-Modification Outstanding Recorded Investment	1,021	1,304
Recorded Investment at period end	634	953
Nonaccrual [Member] | Commercial real estate construction [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Pre-Modification Outstanding Recorded Investment	1,548	1,548
Post-Modification Outstanding Recorded Investment	1,541	1,541
Recorded Investment at period end	694	760
Nonaccrual [Member] | Residential mortgage [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Pre-Modification Outstanding Recorded Investment	566	'
Post-Modification Outstanding Recorded Investment	566	'
Recorded Investment at period end	566	'
Accrual [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Pre-Modification Outstanding Recorded Investment	7,454	4,913
Post-Modification Outstanding Recorded Investment	7,506	4,913
Recorded Investment at period end	7,139	4,815
Accrual [Member] | Commercial real estate [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Pre-Modification Outstanding Recorded Investment	7,118	4,577
Post-Modification Outstanding Recorded Investment	7,170	4,577
Recorded Investment at period end	6,834	4,494
Accrual [Member] | Residential mortgage [Member]	'	'
Financing Receivable, Modifications [Line Items]	'	'
Pre-Modification Outstanding Recorded Investment	336	336
Post-Modification Outstanding Recorded Investment	336	336
Recorded Investment at period end	$305	$321

Loans_Troubled_Debt_Restructur1

Loans (Troubled Debt Restructurings) (Details) (USD $)	3 Months Ended	12 Months Ended
In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	Contract	Contract	Contract	Contract
Financing Receivable, Modifications [Line Items]	'	'	'	'
Troubled debt restructured loan defaulted, number of contracts	'	1	'	'
Troubled debt restructured loan defaulted, amount	'	$237	'	'
Gains (Losses) on Restructuring of Debt	'	353	'	'
Forbearance Agreement, Number of Negotiations	1	2	3	'
Forbearance Agreement Modified, Number of Modified	'	2	'	1
Pre-Modification Outstanding Recorded Investment	'	11,079	8,255	'
Post-Modification Outstanding Recorded Investment	'	11,119	8,243	'
Recorded Investment at period end	'	9,175	6,715	'
Commercial real estate [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	'	1	2	'
Pre-Modification Outstanding Recorded Investment	'	2,541	5,225	'
Post-Modification Outstanding Recorded Investment	'	2,593	5,225	'
Recorded Investment at period end	'	2,542	5,099	'
Residential mortgage [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Number of Contracts	'	1	1	'
Pre-Modification Outstanding Recorded Investment	'	566	336	'
Post-Modification Outstanding Recorded Investment	'	566	336	'
Recorded Investment at period end	'	566	321	'
Nonaccrual [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Pre-Modification Outstanding Recorded Investment	'	3,625	3,342	'
Post-Modification Outstanding Recorded Investment	'	3,613	3,330	'
Recorded Investment at period end	'	2,036	1,900	'
Nonaccrual [Member] | Commercial and industrial [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Pre-Modification Outstanding Recorded Investment	'	490	490	'
Post-Modification Outstanding Recorded Investment	'	485	485	'
Recorded Investment at period end	'	142	187	'
Nonaccrual [Member] | Commercial real estate [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Pre-Modification Outstanding Recorded Investment	'	1,021	1,304	'
Post-Modification Outstanding Recorded Investment	'	1,021	1,304	'
Recorded Investment at period end	'	634	953	'
Nonaccrual [Member] | Commercial real estate construction [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Pre-Modification Outstanding Recorded Investment	'	1,548	1,548	'
Post-Modification Outstanding Recorded Investment	'	1,541	1,541	'
Recorded Investment at period end	'	694	760	'
Nonaccrual [Member] | Residential mortgage [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Pre-Modification Outstanding Recorded Investment	'	566	'	'
Post-Modification Outstanding Recorded Investment	'	566	'	'
Recorded Investment at period end	'	566	'	'
Accrual [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Pre-Modification Outstanding Recorded Investment	'	7,454	4,913	'
Post-Modification Outstanding Recorded Investment	'	7,506	4,913	'
Recorded Investment at period end	'	7,139	4,815	'
Accrual [Member] | Commercial real estate [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Pre-Modification Outstanding Recorded Investment	'	7,118	4,577	'
Post-Modification Outstanding Recorded Investment	'	7,170	4,577	'
Recorded Investment at period end	'	6,834	4,494	'
Accrual [Member] | Residential mortgage [Member]	'	'	'	'
Financing Receivable, Modifications [Line Items]	'	'	'	'
Pre-Modification Outstanding Recorded Investment	'	336	336	'
Post-Modification Outstanding Recorded Investment	'	336	336	'
Recorded Investment at period end	'	$305	$321	'

Loans_Loan_Portfolio_Summarize

Loans (Loan Portfolio Summarized By The Past Due Status) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-59 Days Past Due	$5,922	$5,443	'
60-89 Days Past Due	1,411	4,008	'
Greater than 90 Days	6,075	4,080	'
Total Past Due	13,408	13,531	'
Current	715,240	694,605	'
Total Loans Receivable	728,648	708,136	694,468
Loans Receivable Greater than 90 Days and Accruing	1,926	771	'
Commercial and industrial [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-59 Days Past Due	55	128	'
60-89 Days Past Due	13	0	'
Greater than 90 Days	152	342	'
Total Past Due	220	470	'
Current	58,997	48,534	'
Total Loans Receivable	59,217	49,004	56,145
Loans Receivable Greater than 90 Days and Accruing	3	1	'
Commercial real estate [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-59 Days Past Due	857	757	'
60-89 Days Past Due	552	1,569	'
Greater than 90 Days	1,964	1,502	'
Total Past Due	3,373	3,828	'
Current	235,813	239,191	'
Total Loans Receivable	239,186	243,019	236,017
Loans Receivable Greater than 90 Days and Accruing	0	6	'
Commercial real estate construction [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-59 Days Past Due	0	0	'
60-89 Days Past Due	0	0	'
Greater than 90 Days	788	854	'
Total Past Due	788	854	'
Current	10,408	18,300	'
Total Loans Receivable	11,196	19,154	22,757
Loans Receivable Greater than 90 Days and Accruing	0	0	'
Residential mortgage [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-59 Days Past Due	4,728	4,197	'
60-89 Days Past Due	795	2,425	'
Greater than 90 Days	3,148	1,339	'
Total Past Due	8,671	7,961	'
Current	342,338	320,875	'
Total Loans Receivable	351,009	328,836	311,266
Loans Receivable Greater than 90 Days and Accruing	1,900	721	'
Home equity lines of credit [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-59 Days Past Due	260	353	'
60-89 Days Past Due	36	10	'
Greater than 90 Days	14	43	'
Total Past Due	310	406	'
Current	53,542	52,724	'
Total Loans Receivable	53,852	53,130	52,532
Loans Receivable Greater than 90 Days and Accruing	14	43	'
Consumer [Member]	'	'	'
Financing Receivable, Recorded Investment, Past Due [Line Items]	'	'	'
30-59 Days Past Due	22	8	'
60-89 Days Past Due	15	4	'
Greater than 90 Days	9	0	'
Total Past Due	46	12	'
Current	14,142	14,981	'
Total Loans Receivable	14,188	14,993	15,751
Loans Receivable Greater than 90 Days and Accruing	$9	$0	'

Loans_Allowance_For_Loan_Losse

Loans (Allowance For Loan Losses And Recorded Investment In Financing Receivables) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'	'	'	'	'	'	'	'
Allowance for Loan Losses, Beginning Balance	'	'	'	$16,825	'	'	'	$15,482	$16,825	$15,482	$15,252
Charge-offs	'	'	'	'	'	'	'	'	-2,427	-3,757	-5,243
Recoveries	'	'	'	'	'	'	'	'	243	425	38
Provisions	150	150	500	650	1,300	1,125	1,125	1,125	1,450	4,675	5,435
Allowance for Loan Losses, Ending Balance	16,091	'	'	'	16,825	'	'	'	16,091	16,825	15,482
Ending balance: individually evaluated for impairment	201	'	'	'	36	'	'	'	201	36	1,181
Ending balance: collectively evaluated for impairment	15,890	'	'	'	16,789	'	'	'	15,890	16,789	14,301
Loans receivables, Ending Balance	728,648	'	'	'	708,136	'	'	'	728,648	708,136	694,468
Loans receivables: Ending balance: individually evaluated for impairment	15,712	'	'	'	11,142	'	'	'	15,712	11,142	12,846
Loans receivables: Ending balance: collectively evaluated for impairment	712,936	'	'	'	696,994	'	'	'	712,936	696,994	681,622
Commercial and industrial [Member]	'	'	'	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'	'	'	'	'	'	'	'
Allowance for Loan Losses, Beginning Balance	'	'	'	1,507	'	'	'	2,582	1,507	2,582	2,074
Charge-offs	'	'	'	'	'	'	'	'	-178	-2,180	-1,861
Recoveries	'	'	'	'	'	'	'	'	235	22	34
Provisions	'	'	'	'	'	'	'	'	351	1,083	2,335
Allowance for Loan Losses, Ending Balance	1,915	'	'	'	1,507	'	'	'	1,915	1,507	2,582
Ending balance: individually evaluated for impairment	0	'	'	'	29	'	'	'	0	29	1,085
Ending balance: collectively evaluated for impairment	1,915	'	'	'	1,478	'	'	'	1,915	1,478	1,497
Loans receivables, Ending Balance	59,217	'	'	'	49,004	'	'	'	59,217	49,004	56,145
Loans receivables: Ending balance: individually evaluated for impairment	1,574	'	'	'	341	'	'	'	1,574	341	2,219
Loans receivables: Ending balance: collectively evaluated for impairment	57,643	'	'	'	48,663	'	'	'	57,643	48,663	53,926
Commercial real estate [Member]	'	'	'	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'	'	'	'	'	'	'	'
Allowance for Loan Losses, Beginning Balance	'	'	'	6,576	'	'	'	6,007	6,576	6,007	6,346
Charge-offs	'	'	'	'	'	'	'	'	-996	-417	-1,308
Recoveries	'	'	'	'	'	'	'	'	0	250	0
Provisions	'	'	'	'	'	'	'	'	239	736	969
Allowance for Loan Losses, Ending Balance	5,819	'	'	'	6,576	'	'	'	5,819	6,576	6,007
Ending balance: individually evaluated for impairment	0	'	'	'	7	'	'	'	0	7	43
Ending balance: collectively evaluated for impairment	5,819	'	'	'	6,569	'	'	'	5,819	6,569	5,964
Loans receivables, Ending Balance	239,186	'	'	'	243,019	'	'	'	239,186	243,019	236,017
Loans receivables: Ending balance: individually evaluated for impairment	11,197	'	'	'	9,009	'	'	'	11,197	9,009	6,612
Loans receivables: Ending balance: collectively evaluated for impairment	227,989	'	'	'	234,010	'	'	'	227,989	234,010	229,405
Commercial real estate construction [Member]	'	'	'	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'	'	'	'	'	'	'	'
Allowance for Loan Losses, Beginning Balance	'	'	'	518	'	'	'	548	518	548	1,154
Charge-offs	'	'	'	'	'	'	'	'	0	-538	-1,242
Recoveries	'	'	'	'	'	'	'	'	0	149	0
Provisions	'	'	'	'	'	'	'	'	-271	359	636
Allowance for Loan Losses, Ending Balance	247	'	'	'	518	'	'	'	247	518	548
Ending balance: individually evaluated for impairment	0	'	'	'	0	'	'	'	0	0	0
Ending balance: collectively evaluated for impairment	247	'	'	'	518	'	'	'	247	518	548
Loans receivables, Ending Balance	11,196	'	'	'	19,154	'	'	'	11,196	19,154	22,757
Loans receivables: Ending balance: individually evaluated for impairment	788	'	'	'	854	'	'	'	788	854	2,614
Loans receivables: Ending balance: collectively evaluated for impairment	10,408	'	'	'	18,300	'	'	'	10,408	18,300	20,143
Residential mortgage [Member]	'	'	'	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'	'	'	'	'	'	'	'
Allowance for Loan Losses, Beginning Balance	'	'	'	3,721	'	'	'	3,624	3,721	3,624	3,108
Charge-offs	'	'	'	'	'	'	'	'	-1,062	-500	-750
Recoveries	'	'	'	'	'	'	'	'	4	1	2
Provisions	'	'	'	'	'	'	'	'	1,350	596	1,264
Allowance for Loan Losses, Ending Balance	4,013	'	'	'	3,721	'	'	'	4,013	3,721	3,624
Ending balance: individually evaluated for impairment	201	'	'	'	0	'	'	'	201	0	53
Ending balance: collectively evaluated for impairment	3,812	'	'	'	3,721	'	'	'	3,812	3,721	3,571
Loans receivables, Ending Balance	351,009	'	'	'	328,836	'	'	'	351,009	328,836	311,266
Loans receivables: Ending balance: individually evaluated for impairment	2,153	'	'	'	938	'	'	'	2,153	938	1,401
Loans receivables: Ending balance: collectively evaluated for impairment	348,856	'	'	'	327,898	'	'	'	348,856	327,898	309,865
Home equity lines of credit [Member]	'	'	'	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'	'	'	'	'	'	'	'
Allowance for Loan Losses, Beginning Balance	'	'	'	517	'	'	'	507	517	507	341
Charge-offs	'	'	'	'	'	'	'	'	0	-51	-52
Recoveries	'	'	'	'	'	'	'	'	0	0	0
Provisions	'	'	'	'	'	'	'	'	20	61	218
Allowance for Loan Losses, Ending Balance	537	'	'	'	517	'	'	'	537	517	507
Ending balance: individually evaluated for impairment	0	'	'	'	0	'	'	'	0	0	0
Ending balance: collectively evaluated for impairment	537	'	'	'	517	'	'	'	537	517	507
Loans receivables, Ending Balance	53,852	'	'	'	53,130	'	'	'	53,852	53,130	52,532
Loans receivables: Ending balance: individually evaluated for impairment	0	'	'	'	0	'	'	'	0	0	0
Loans receivables: Ending balance: collectively evaluated for impairment	53,852	'	'	'	53,130	'	'	'	53,852	53,130	52,532
Consumer [Member]	'	'	'	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'	'	'	'	'	'	'	'
Allowance for Loan Losses, Beginning Balance	'	'	'	633	'	'	'	419	633	419	520
Charge-offs	'	'	'	'	'	'	'	'	-191	-71	-30
Recoveries	'	'	'	'	'	'	'	'	4	3	2
Provisions	'	'	'	'	'	'	'	'	501	282	-73
Allowance for Loan Losses, Ending Balance	947	'	'	'	633	'	'	'	947	633	419
Ending balance: individually evaluated for impairment	0	'	'	'	0	'	'	'	0	0	0
Ending balance: collectively evaluated for impairment	947	'	'	'	633	'	'	'	947	633	419
Loans receivables, Ending Balance	14,188	'	'	'	14,993	'	'	'	14,188	14,993	15,751
Loans receivables: Ending balance: individually evaluated for impairment	0	'	'	'	0	'	'	'	0	0	0
Loans receivables: Ending balance: collectively evaluated for impairment	14,188	'	'	'	14,993	'	'	'	14,188	14,993	15,751
Unallocated [Member]	'	'	'	'	'	'	'	'	'	'	'
Financing Receivable, Allowance for Credit Losses [Roll Forward]	'	'	'	'	'	'	'	'	'	'	'
Allowance for Loan Losses, Beginning Balance	'	'	'	3,353	'	'	'	1,795	3,353	1,795	1,709
Charge-offs	'	'	'	'	'	'	'	'	0	'	0
Recoveries	'	'	'	'	'	'	'	'	0	'	0
Provisions	'	'	'	'	'	'	'	'	-740	1,558	86
Allowance for Loan Losses, Ending Balance	2,613	'	'	'	3,353	'	'	'	2,613	3,353	1,795
Ending balance: individually evaluated for impairment	0	'	'	'	0	'	'	'	0	0	0
Ending balance: collectively evaluated for impairment	2,613	'	'	'	3,353	'	'	'	2,613	3,353	1,795
Loans receivables, Ending Balance	0	'	'	'	0	'	'	'	0	0	0
Loans receivables: Ending balance: individually evaluated for impairment	0	'	'	'	0	'	'	'	0	0	0
Loans receivables: Ending balance: collectively evaluated for impairment	$0	'	'	'	$0	'	'	'	$0	$0	$0

Loans_Narrative_Details

Loans (Narrative) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Accounts, Notes, Loans and Financing Receivable, Gross, Allowance, and Net [Abstract]	'	'	'
Loans and Leases Receivable, Impaired, Interest Lost on Nonaccrual Loans	$704	$543	$652
Loans and Leases Receivable, Related Parties	14,969	12,351	'
Loans and Leases Receivable, Related Parties, Additions	4,476	'	'
Loans and Leases Receivable, Related Parties, Collections	$1,858	'	'

Premises_And_Equipment_Narrati

Premises And Equipment (Narrative) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Property, Plant and Equipment [Abstract]	'	'	'
Depreciation	$1,352	$1,401	$1,578

Premises_And_Equipment_Table_D

Premises And Equipment (Table) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Property, Plant and Equipment [Line Items]	'	'
Premises and equipment, gross	$34,556	$32,428
Accumulated depreciation	-18,565	-17,297
Premises and equipment, net	15,991	15,131
Land [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Premises and equipment, gross	2,591	2,591
Buildings and improvements [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Premises and equipment, gross	17,060	17,004
Furniture and equipment [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Premises and equipment, gross	12,946	12,820
Assets in process [Member]	'	'
Property, Plant and Equipment [Line Items]	'	'
Premises and equipment, gross	$1,959	$13

Investments_in_LowIncome_Housi1

Investments in Low-Income Housing Partnerships (Narrative) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Real Estate Partnership Investment Subsidiaries, Net Income (Loss) before Tax [Abstract]	'	'
Investments in low-income housing partnerships	$4,687	$5,440

Deposits_Schedule_Of_Deposits_

Deposits (Schedule Of Deposits) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Interest-bearing Deposit Liabilities [Abstract]	'	'
Non-interest bearing demand	$128,011	$119,297
Interest bearing demand	115,014	122,717
Savings	321,818	320,454
Time certificates of deposit less than $100,000	165,491	191,019
Time certificates of deposit greater than $100,000	70,309	80,689
Total Deposits	$800,643	$834,176

Deposits_Schedule_Of_Maturitie

Deposits (Schedule Of Maturities Of Time Certificates Of Deposits) (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Interest-bearing Deposit Liabilities [Abstract]	'
2014	$152,255
2015	34,252
2016	41,156
2017	4,162
2018	3,975
Time Deposits	$235,800

Lease_Commitments_Narrative_De

Lease Commitments (Narrative) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Leases [Abstract]	'	'	'
Operating Leases, Rent Expense, Net	$468	$424	$405
Description of Lessee Leasing Arrangements, Operating Leases	'ACNB leases space at several of its owned offices to other unrelated organizations under agreements that expire at varying dates in 2014. Most leases contain renewal provisions at the option of the lessee.	'	'
Operating Leases, Income Statement, Lease Revenue	$138	$133	$130

Lease_Commitments_Table_Detail

Lease Commitments (Table) (Details) (new) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Leases [Abstract]	'
2014	$413
2015	343
2016	230
2017	86
2018	86
Later years	303
Total future minimum rental payments	$1,461

Borrowings_Schedule_of_Shortte

Borrowings (Schedule of Short-term Debt) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Short-term Debt [Line Items]	'	'
Short-term Borrowings	$49,052	$47,303
Short-term Debt, Weighted Average Interest Rate	0.14%	0.14%
Federal Home Loan Bank Stock	6,563	'
Line of Credit Facility, Current Borrowing Capacity	15,000	'
FHLB overnight advance [Member]	'	'
Short-term Debt [Line Items]	'	'
Short-term Borrowings	6,800	0
Short-term Debt, Weighted Average Interest Rate	0.25%	0.00%
Securities Sold under Agreements to Repurchase [Member]	'	'
Short-term Debt [Line Items]	'	'
Short-term Borrowings	$42,252	$47,303
Short-term Debt, Weighted Average Interest Rate	0.12%	0.14%

Borrowings_Borrowings_Offsetti

Borrowings Borrowings (Offsetting Liabilities) (Details) (USD $)	Dec. 31, 2013		Dec. 31, 2012
In Thousands, unless otherwise specified
Offsetting Liabilities [Line Items]	'		'
Fair value of securities pledged in connection with repurchase agreements	$60,823		$56,392
Commercial Customers and Government Entities [Member]	'		'
Offsetting Liabilities [Line Items]	'		'
Gross Amounts of Recognized Liabilities	42,252	[1]	47,303	[1]
Gross Amounts Offset in the Statements of Condition	0	[1]	0	[1]
Net Amounts of Liabilities Presented in the Statements of Condition	42,252	[1]	47,303	[1]
Gross Amounts Not Offset in the Statements of Condition, Financial Instruments	-42,252	[1]	-47,303	[1]
Gross Amounts Not Offset in the Statements of Condition, Cash Collateral Pledged	0	[1]	0	[1]
Net Amount	$0	[1]	$0	[1]
[1]	As of December 31, 2013 and 2012, the fair value of securities pledged in connection with repurchase agreements was $60,823,000 and $56,392,000, respectively.

Borrowings_Schedule_of_Maturit

Borrowings (Schedule of Maturities of Long-term Debt) (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Debt Disclosure [Abstract]	'	'
FHLB fixed-rate advances maturing in 2013, Amount	$0	$14,000,000
FHLB fixed-rate advances maturing in 2013, Rate	0.00%	2.55%
FHLB fixed-rate advances maturing in 2014, Amount	29,000,000	14,000,000
FHLB fixed-rate advances maturing in 2014, Rate	1.51%	2.73%
FHLB fixed-rate advances maturing in 2015, Amount	21,000,000	15,000,000
FHLB fixed-rate advances maturing in 2015, Rate	2.50%	3.25%
FHLB fixed-rate advances maturing in 2016, Amount	15,000,000	9,000,000
FHLB fixed-rate advances maturing in 2016, Rate	2.19%	2.56%
FHLB fixed-rate advances maturing in 2017, Amount	6,000,000	4,000,000
FHLB fixed-rate advances maturing in 2017, Rate	3.76%	4.86%
FHLB fixed-rate advances maturing in 2018, Amount	10,000,000	2,000,000
FHLB fixed-rate advances maturing in 2018, Rate	2.48%	5.11%
Loan payable to local bank	1,703,000	1,954,000
Loan payable to local bank, Rate	6.02%	5.96%
FHLB fixed-rate advances, Amount	82,703,000	59,954,000
FHLB fixed-rate advances, Rate	3.08%	3.86%
Federal Home Loan Bank, Advances, General Debt Obligations, Maximum Amount Available	420,550,000	'
Federal Home Loan Bank, Advances, General Debt Obligations, Amount of Available, Unused Funds	332,750,000	'
Loan payable monthly installments	$29,472	'

Regulatory_Restrictions_On_Div1

Regulatory Restrictions On Dividends (Narrative) (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Disclosure of Restrictions on Dividends, Loans and Advances Disclosure [Abstract]	'
Amount Available for Dividend Distribution without Prior Approval from Regulatory Agency	$10,772

Income_Taxes_Schedule_of_Compo

Income Taxes (Schedule of Components of Income Tax Expense (Benefit)) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Federal: Current	$1,800	$2,163	$1,816
Federal: Deferred	693	108	279
Federal Income Tax Expense (Benefit), Total	2,493	2,271	2,095
State: Current	42	48	59
Current Income Tax Expense (Benefit), Total	$2,535	$2,319	$2,154

Income_Taxes_Schedule_of_Recon

Income Taxes (Schedule of Reconciliations of the Statutory Federal Income Tax) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Federal income tax at statutory rate	34.00%	34.00%	34.00%
State income taxes, net of federal benefit	0.20%	0.20%	0.40%
Tax-exempt income	-4.60%	-5.90%	-6.00%
Earnings on investment in bank-owned life insurance	-2.80%	-3.00%	-3.10%
Rehabilitation and low-income housing credits	-5.70%	-4.90%	-5.20%
Other	0.30%	0.30%	0.10%
Effective Income Tax Rate, Total	21.40%	20.70%	20.20%

Income_Taxes_Narrative_Details

Income Taxes (Narrative) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Income Tax Disclosure [Abstract]	'	'	'
Income Taxes Related To Net Gains On Sales Of Securities	$0	$2	$0
Rehabilitation and Low-Income Housing Income Tax Credits	678	556	556
Projected Tax Credit, 2014	648	'	'
Projected Tax Credit, 2015	299	'	'
Projected Tax Credit, Thereafter	2,025	'	'
Federal tax credit carryforward	$287	'	'

Income_Taxes_Components_of_Def

Income Taxes (Components of Deferred Tax Assets and Liabilities) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Deferred Tax Assets, Net [Abstract]	'	'
Allowance for loan losses	$5,471	$5,721
Accrued deferred compensation	806	726
Pension	1,269	3,000
Deferred loan fees	5	16
Other-than-temporary impairment	178	178
Low-income housing tax credit carryforward	287	195
Nonaccrual interest	191	183
Director deferred liability	419	351
Other	387	468
Deferred tax assets: Total	9,013	10,838
Deferred Tax Liabilities, Net [Abstract]	'	'
Available for sale securities	1,323	2,891
Prepaid pension benefit cost	5,488	4,741
Prepaid expenses	237	213
Accumulated depreciation	358	558
Goodwill/intangibles	677	649
Deferred tax liabilities: Total	8,083	9,052
Net Deferred Tax Asset	$930	$1,786

Fair_Value_Measurements_Fair_V

Fair Value Measurements (Fair Value Measurements, Recurring and Nonrecurring) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	$129,983	$165,790
Foreclosed assets held for resale	1,762	4,247
Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	129,983	165,790
Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	1,905	1,876
Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	128,078	163,914
U.S. Government and agencies [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	21,651	24,241
Mortgage-backed securities [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	53,740	80,583
State and municipal [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	41,522	51,804
Corporate bonds [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	11,165	7,286
CRA mutual fund [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	1,033	1,096
Stock in other banks [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	872	780
Fair Value, Measurements, Recurring [Member] | Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	129,983	165,790
Fair Value, Measurements, Recurring [Member] | Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	1,905	1,876
Fair Value, Measurements, Recurring [Member] | Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	128,078	163,914
Fair Value, Measurements, Recurring [Member] | U.S. Government and agencies [Member] | Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	21,651	24,241
Fair Value, Measurements, Recurring [Member] | U.S. Government and agencies [Member] | Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	21,651	24,241
Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities [Member] | Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	53,740	80,583
Fair Value, Measurements, Recurring [Member] | Mortgage-backed securities [Member] | Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	53,740	80,583
Fair Value, Measurements, Recurring [Member] | State and municipal [Member] | Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	41,522	51,804
Fair Value, Measurements, Recurring [Member] | State and municipal [Member] | Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	41,522	51,804
Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] | Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	11,165	7,286
Fair Value, Measurements, Recurring [Member] | Corporate bonds [Member] | Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	11,165	7,286
Fair Value, Measurements, Recurring [Member] | CRA mutual fund [Member] | Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	1,033	1,096
Fair Value, Measurements, Recurring [Member] | CRA mutual fund [Member] | Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	1,033	1,096
Fair Value, Measurements, Recurring [Member] | Stock in other banks [Member] | Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	872	780
Fair Value, Measurements, Recurring [Member] | Stock in other banks [Member] | Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Securities Available-for-sale, Fair Value	872	780
Fair Value, Measurements, Nonrecurring [Member] | Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Impaired loans	6,887	2,415
Foreclosed assets held for resale	413	2,338
Fair Value, Measurements, Nonrecurring [Member] | Level 3 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Impaired loans	6,887	2,415
Foreclosed assets held for resale	$413	$2,338

Fair_Value_Measurements_Fair_V1

Fair Value Measurements (Fair Value Inputs, Assets, Quantitative Information) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Foreclosed assets held for resale	1,762	4,247
Impaired loans [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Discount rate	-19.00%	-16.00%
Foreclosed assets held for resale [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Discount rate	-35.00%	-40.00%
Minimum [Member] | Impaired loans [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Discount rate	-10.00%	-10.00%
Minimum [Member] | Foreclosed assets held for resale [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Discount rate	-10.00%	-10.00%
Maximum [Member] | Impaired loans [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Discount rate	-50.00%	-50.00%
Maximum [Member] | Foreclosed assets held for resale [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Discount rate	-50.00%	-50.00%
Fair Value, Measurements, Nonrecurring [Member] | Fair Value [Member]	'	'
Fair Value Inputs, Assets, Quantitative Information [Line Items]	'	'
Impaired loans	6,887	2,415
Foreclosed assets held for resale	413	2,338

Fair_Value_Measurements_Fair_V2

Fair Value Measurements (Fair Value, by Balance Sheet Grouping) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Interest bearing deposits in banks	$4,153	$32,307
Investment securities: Available for sale	129,983	165,790
Investment securities: Held to maturity	92,082	50,980
Restricted investment in bank stocks	6,861	5,318
Carrying Amount [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Cash and due from banks	13,963	19,078
Interest bearing deposits in banks	4,153	32,307
Investment securities: Available for sale	129,983	165,790
Investment securities: Held to maturity	94,373	50,159
Loans held for sale	496	6,687
Loans, less allowance for loan losses	712,557	691,311
Accrued interest receivable	3,027	3,360
Restricted investment in bank stocks	6,861	5,318
Deposits	800,643	834,176
Short-term borrowings	49,052	47,303
Long-term borrowings	82,703	59,954
Accrued interest payable	681	1,114
Fair Value [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Cash and due from banks	13,963	19,078
Interest bearing deposits in banks	4,153	32,307
Investment securities: Available for sale	129,983	165,790
Investment securities: Held to maturity	92,082	50,980
Loans held for sale	496	6,687
Loans, less allowance for loan losses	724,937	724,982
Accrued interest receivable	3,027	3,360
Restricted investment in bank stocks	6,861	5,318
Deposits	801,063	835,640
Short-term borrowings	49,052	47,303
Long-term borrowings	84,558	62,296
Accrued interest payable	681	1,114
Level 1 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Cash and due from banks	7,755	5,832
Interest bearing deposits in banks	4,153	32,307
Investment securities: Available for sale	1,905	1,876
Level 2 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Cash and due from banks	6,208	13,246
Investment securities: Available for sale	128,078	163,914
Investment securities: Held to maturity	92,082	50,980
Loans held for sale	496	6,687
Accrued interest receivable	3,027	3,360
Restricted investment in bank stocks	6,861	5,318
Deposits	801,063	835,640
Short-term borrowings	49,052	47,303
Long-term borrowings	84,558	62,296
Accrued interest payable	681	1,114
Level 3 [Member]	'	'
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]	'	'
Loans, less allowance for loan losses	$724,937	$724,982

Retirement_Plans_Schedule_of_B

Retirement Plans (Schedule of Benefit Plan Funded Status) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward]	'	'	'
Benefit obligation at beginning of year	$24,297	$20,989	'
Service cost	774	651	570
Interest cost	894	925	962
Actuarial (gain) loss	-2,725	2,590	'
Benefits paid	-937	-858	'
Benefit obligation at end of year	22,303	24,297	20,989
Defined Benefit Plan, Change in Fair Value of Plan Assets [Roll Forward]	'	'	'
Fair value of plan assets at beginning of year	29,418	25,451	'
Actual return on plan assets	3,631	2,969	'
Employer contribution	2,599	1,856	'
Benefits paid	-937	-858	'
Fair value of plan assets at end of year	34,711	29,418	25,451
Funded Status, included in other assets	12,408	5,121	'
Amounts recognized in accumulated other comprehensive income: Total net actuarial loss	3,667	8,719	'
Amounts recognized in accumulated other comprehensive income: Prior service cost	65	105	'
Total included in accumulated other comprehensive income (pretax)	$3,732	$8,824	'

Retirement_Plans_Estimated_Cos

Retirement Plans (Estimated Costs To Be Amortized From AOCI Into Net Periodic Pension Cost) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013
Postemployment Benefits [Abstract]	'
Net loss	$22
Prior service cost	40
Total costs to be amortized from AOCI into Net Periodic Pension Cost	$62

Retirement_Plans_Narrative_Det

Retirement Plans (Narrative) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
	Person
Postemployment Benefits [Abstract]	'	'	'
Accumulated Benefit Obligation	$21,713	$23,757	'
Corporation Common Stock Included in Equity Securities	1,128	967	'
Corporation Common Stock Included in Equity Securities, Percentage of Total Plan Assets	3.00%	3.00%	'
Percentage of participants average monthly pay used to calculate benefit accruals	0.75%	'	'
Maximum years of benefit used to calculate benefit accruals	'25 years	'	'
Number of active, vested terminated, and retired persons in the Plan	368	'	'
Employee contribution percentage, maximum	100.00%	'	'
Employer Match Percentage of Income	4.00%	'	'
Bank Contributions to and Expenses for the Plan	500	486	461
Non-Qualified Compensation Plan for Senior Officers, Balance Accrued in Other Liabilities	1,744	1,545	'
Non-Qualified Compensation Plan for Senior Officers, Annual expense included in Salaries and Benefits Expense	321	297	143
Non-Qualified Compensation Plan for Senior Officers, Cash Surrender Value	$4,616	$4,494	'

Retirement_Plans_Components_Of

Retirement Plans (Components Of Net Periodic Benefit Costs (Income)) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Postemployment Benefits [Abstract]	'	'	'
Service cost	$774	$651	$570
Interest cost	894	925	962
Expected return on plan assets	-1,957	-1,772	-1,829
Recognized net actuarial loss	652	611	140
Amortization of transition liability	0	10	12
Amortization of prior service cost	40	40	40
Net Periodic Benefit Cost (Income)	403	465	-105
Net (gain) loss	-4,400	1,393	4,130
Amortization of net loss	-652	-611	-140
Amortization of transition liability	0	-10	-12
Amortization of prior service cost	-40	-40	-40
Total recognized in other comprehensive (income) loss	-5,092	732	3,938
Total recognized in net periodic benefit cost (income) and other comprehensive (income) loss	($4,689)	$1,197	$3,833

Retirement_Plans_Assumptions_U

Retirement Plans (Assumptions Used To Determine The Benefit Obligation and Net Periodic Benefit) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Postemployment Benefits [Abstract]	'	'	'
Assumptions Used Calculating Benefit Obligation: Discount rate	4.75%	3.75%	4.50%
Assumptions Used Calculating Benefit Obligation: Rate of compensation increase	3.75%	3.75%	4.00%
Assumptions Used Calculating Net Periodic Benefit Cost: Discount rate	3.75%	4.50%	5.50%
Assumptions Used Calculating Net Periodic Benefit Cost: Expected long-term rate of return on plan assets	6.75%	7.00%	7.50%
Assumptions Used Calculating Net Periodic Benefit Cost: Rate of compensation increase	3.75%	4.00%	3.58%

Retirement_Plans_Pension_Plan_

Retirement Plans (Pension Plan Weighted-Average Assets' Allocations) (Details)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items]	'	'
Weighted-Average Asset Allocation	100.00%	100.00%
Equity securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Weighted-Average Asset Allocation	46.00%	45.00%
Debt securities [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Weighted-Average Asset Allocation	45.00%	45.00%
Short-term fixed income [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Weighted-Average Asset Allocation	4.00%	6.00%
Real estate [Member]	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'
Weighted-Average Asset Allocation	5.00%	4.00%

Retirement_Plans_Fair_Value_Me

Retirement Plans (Fair Value Measurements) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
In Thousands, unless otherwise specified
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	$34,711	$29,418	$25,451
Equity securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	17,385	14,951	'
Debt securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	15,754	13,155	'
Real estate [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	1,572	1,312	'
Level 1 [Member] | Equity securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	1,128	967	'
Level 2 [Member] | Equity securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	16,257	13,984	'
Level 2 [Member] | Debt securities [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	15,754	13,155	'
Level 2 [Member] | Real estate [Member]	'	'	'
Defined Benefit Plan Disclosure [Line Items]	'	'	'
Fair value of plan assets	$1,572	$1,312	'

Retirement_Plans_Future_Benefi

Retirement Plans (Future Benefit Payments) (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Postemployment Benefits [Abstract]	'
2014	$1,020
2015	1,030
2016	1,070
2017	1,170
2018	1,260
2019-2023	$7,570

Regulatory_Matters_Narrative_D

Regulatory Matters (Narrative) (Details)	12 Months Ended			0 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	5-May-09
				Maximum [Member]
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'	'	'
Stock Issued During Period, Shares, Restricted Stock Award, Gross	0	'	'	200,000
Stock Issued During Period, Shares, Dividend Reinvestment Plan	25,943	19,559	17,466	'

Regulatory_Matters_The_Actual_

Regulatory Matters (The Actual and Required Capital Amounts and Ratios) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Corporation [Member]	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Actual, Tier 1 leverage ratio (to average assets), Amount	$98,704	$92,860
Actual, Tier 1 leverage ratio (to average assets), Ratio	9.54%	8.76%
For Capital Adequacy Purposes, Tier 1 leverage ratio (to average assets), Amount	41,367	42,424
For Capital Adequacy Purposes, Tier 1 leverage ratio (to average assets), Ratio	4.00%	4.00%
Actual, Tier 1 risk-based capital ratio (to risk- weighted assets), Amount	98,704	92,860
Actual, Tier 1 risk-based capital ratio (to risk- weighted assets), Ratio	14.09%	13.65%
For Capital Adequacy Purposes, Tier 1 risk-based capital ratio (to risk- weighted assets), Amount	28,014	27,211
For Capital Adequacy Purposes, Tier 1 risk-based capital ratio (to risk- weighted assets), Ratio	4.00%	4.00%
Actual, Total risk-based capital ratio (to risk- weighted assets), Amount	107,623	101,512
Actual, Total risk-based capital ratio (to risk- weighted assets), Ratio	15.37%	14.92%
For Capital Adequacy Purposes, Total risk-based capital ratio (to risk- weighted assets), Amount	56,027	54,422
For Capital Adequacy Purposes, Total risk-based capital ratio (to risk- weighted assets), Ratio	8.00%	8.00%
Bank [Member]	'	'
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items]	'	'
Actual, Tier 1 leverage ratio (to average assets), Amount	90,339	86,288
Actual, Tier 1 leverage ratio (to average assets), Ratio	8.76%	8.14%
For Capital Adequacy Purposes, Tier 1 leverage ratio (to average assets), Amount	41,240	42,399
For Capital Adequacy Purposes, Tier 1 leverage ratio (to average assets), Ratio	4.00%	4.00%
To be Well Capitalized under Prompt Corrective Action Provisions, Tier 1 leverage ratio (to average assets), Amount	51,550	52,999
To be Well Capitalized under Prompt Corrective Action Provisions, Tier 1 leverage ratio (to average assets), Ratio	5.00%	5.00%
Actual, Tier 1 risk-based capital ratio (to risk- weighted assets), Amount	90,339	86,288
Actual, Tier 1 risk-based capital ratio (to risk- weighted assets), Ratio	12.99%	12.80%
For Capital Adequacy Purposes, Tier 1 risk-based capital ratio (to risk- weighted assets), Amount	27,808	26,959
For Capital Adequacy Purposes, Tier 1 risk-based capital ratio (to risk- weighted assets), Ratio	4.00%	4.00%
To be Well Capitalized under Prompt Corrective Action Provisions, Tier 1 risk-based capital ratio (to risk- weighted assets), Amount	41,712	40,439
To be Well Capitalized under Prompt Corrective Action Provisions, Tier 1 risk-based capital ratio (to risk- weighted assets), Ratio	6.00%	6.00%
Actual, Total risk-based capital ratio (to risk- weighted assets), Amount	99,121	94,840
Actual, Total risk-based capital ratio (to risk- weighted assets), Ratio	14.26%	14.07%
For Capital Adequacy Purposes, Total risk-based capital ratio (to risk- weighted assets), Amount	55,616	53,919
For Capital Adequacy Purposes, Total risk-based capital ratio (to risk- weighted assets), Ratio	8.00%	8.00%
To be Well Capitalized under Prompt Corrective Action Provisions, Total risk-based capital ratio (to risk- weighted assets), Amount	$69,520	$67,398
To be Well Capitalized under Prompt Corrective Action Provisions, Total risk-based capital ratio (to risk- weighted assets), Ratio	10.00%	10.00%

Financial_Instruments_With_Off2

Financial Instruments With Off-Balance Sheet Risk (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Jun. 30, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
			Commitments to Extend Credit [Member]	Commitments to Extend Credit [Member]	Standby Letters of Credit [Member]	Standby Letters of Credit [Member]
Fair Value, Off-balance Sheet Risks, Disclosure Information [Line Items]	'	'	'	'	'	'
Loan to value ratio requirement (no greater than 80%)	80.00%	'	'	'	'	'
Commercial line of credit borrowing capacity	'	$500,000	'	'	'	'
Corporation's commitments amount	'	'	$156,135,000	$145,421,000	$4,176,000	$4,772,000

ACNB_Corporation_Parent_Compan2

ACNB Corporation (Parent Company Only) Financial Information (Statements of Condition) (Details) (USD $)	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
In Thousands, unless otherwise specified
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Cash	$13,963	$19,078	'	'
Investments in low-income housing partnerships	4,687	5,440	'	'
Securities and other assets	20,831	14,688	'	'
Total assets	1,046,047	1,049,995	1,004,823	'
Long-term debt	82,703	59,954	'	'
Other liabilities	6,847	7,298	'	'
Stockholders’ equity	106,802	101,264	97,474	93,754
Total Liabilities and Stockholders’ Equity	1,046,047	1,049,995	'	'
Parent Company [Member]	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Cash	3,585	1,161	'	'
Investments in low-income housing partnerships	2,427	3,334	'	'
Securities and other assets	1,563	1,504	'	'
Receivable from banking subsidiary	1,828	985	'	'
Total assets	108,850	103,301	'	'
Long-term debt	1,703	1,954	'	'
Other liabilities	345	83	'	'
Stockholders’ equity	106,802	101,264	'	'
Total Liabilities and Stockholders’ Equity	108,850	103,301	'	'
Banking Subsidiary [Member] | Parent Company [Member]	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Investment	90,294	85,975	'	'
Other Subsidiary [Member] | Parent Company [Member]	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'
Investment	$9,153	$10,342	'	'

ACNB_Corporation_Parent_Compan3

ACNB Corporation (Parent Company Only) Financial Information (Statements of Income) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Other income	'	'	'	'	'	'	'	'	$11,703	$11,867	$11,737
Income tax benefit	'	'	'	'	'	'	'	'	-2,535	-2,319	-2,154
Net Income	2,267	2,308	2,322	2,418	2,218	2,304	2,128	2,236	9,315	8,886	8,502
Comprehensive Income	'	'	'	'	'	'	'	'	9,633	8,019	7,975
Parent Company [Member]	'	'	'	'	'	'	'	'	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'	'	'	'	'	'	'	'	'
Dividends from banking subsidiary	'	'	'	'	'	'	'	'	4,781	4,762	4,689
Other income	'	'	'	'	'	'	'	'	34	44	47
Total Revenues	'	'	'	'	'	'	'	'	4,815	4,806	4,736
Expenses	'	'	'	'	'	'	'	'	817	591	494
Net income before taxes and equity in undistributed earnings of subsidiaries	'	'	'	'	'	'	'	'	3,998	4,215	4,242
Income tax benefit	'	'	'	'	'	'	'	'	944	736	709
Net income before equity in undistributed earnings of subsidiaries	'	'	'	'	'	'	'	'	4,942	4,951	4,951
Equity in undistributed earnings of subsidiaries	'	'	'	'	'	'	'	'	4,373	3,935	3,551
Net Income	'	'	'	'	'	'	'	'	9,315	8,886	8,502
Comprehensive Income	'	'	'	'	'	'	'	'	$9,633	$8,019	$7,975

ACNB_Corporation_Parent_Compan4

ACNB Corporation (Parent Company Only) Financial Information (Statements of Cash Flows) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Condensed Financial Statements, Captions [Line Items]	'	'	'
NET INCOME	$9,315	$8,886	$8,502
Net Cash Provided by Operating Activities	17,986	9,303	18,154
Proceeds from sale of low-income housing partnerships	476	0	0
Net Cash Used in Investing Activities	-38,125	-17,797	-48,286
Repayments on long-term borrowings	-14,251	-21,237	-10,308
Proceeds from issuance of common stock	447	295	257
Dividends paid	-4,542	-4,524	-4,512
Net Cash (Used in) Provided by Financing Activities	-13,130	37,256	28,582
Net (Decrease) Increase in Cash and Cash Equivalents	-33,269	28,762	-1,550
CASH AND CASH EQUIVALENTS — BEGINNING	51,385	22,623	24,173
CASH AND CASH EQUIVALENTS — ENDING	18,116	51,385	22,623
Parent Company [Member]	'	'	'
Condensed Financial Statements, Captions [Line Items]	'	'	'
NET INCOME	9,315	8,886	8,502
Equity in undistributed earnings of subsidiaries	-4,373	-3,935	-3,551
(Increase) Decrease in receivable from banking subsidiary	-843	-261	-350
Other	695	671	45
Net Cash Provided by Operating Activities	4,794	5,361	4,646
Return of Investment from Subsidiary	1,500	0	0
Proceeds from sale of low-income housing partnerships	476	0	0
Net Cash Used in Investing Activities	1,976	0	0
Repayments on long-term borrowings	-251	-237	-308
Proceeds from issuance of common stock	447	295	257
Dividends paid	-4,542	-4,524	-4,512
Net Cash (Used in) Provided by Financing Activities	-4,346	-4,466	-4,563
Net (Decrease) Increase in Cash and Cash Equivalents	2,424	895	83
CASH AND CASH EQUIVALENTS — BEGINNING	1,161	266	183
CASH AND CASH EQUIVALENTS — ENDING	$3,585	$1,161	$266

Acquisitions_Narrative_Details

Acquisitions (Narrative) (Details) (USD $)	0 Months Ended		12 Months Ended			12 Months Ended		0 Months Ended	12 Months Ended
	Jan. 13, 2011	Jan. 05, 2005	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2007	Dec. 31, 2008	Dec. 31, 2008	Dec. 31, 2010	Dec. 31, 2013
						2007 Acquisition [Member]	2008 Acquisition [Member]	Marks Insurance & Associates, Inc. [Member]	2010 Acquisition [Member]	2013 Acquisition [Member]
						Book_of_Business
Business Acquisition [Line Items]	'	'	'	'	'	'	'	'	'	'
Acquisition Date	'	'	5-Jan-05	'	'	'	'	'	'	'
Contingent Consideration Payable	'	$3,000,000	'	'	$338,000	'	'	'	'	'
Intangible asset amortization life	'	'	'	'	'	'	'	'10 years	'	'
Length of period subsequent to acquisition subject to performance criteria to determine contingent consideration	'	'3 years	'	'	'	'	'	'	'	'
Aggregate Purchase Price	'	8,663,000	'	'	'	637,000	1,165,000	1,853,000	31,000	77,000
Employment agreement, term	'3 years	'	'	'	'	'	'	'	'	'
Number of books of business acquired	'	'	'	'	'	2	'	'	'	'
Purchase Price Classified as Intangible Assets	'	'	'	'	'	'	'	1,300,000	'	'
Purchase Price Classified as Goodwill	'	'	$6,308,000	$6,308,000	'	'	'	$553,000	'	'

Acquisitions_Carrying_Value_An

Acquisitions (Carrying Value And Accumulated Amortization Of The Intangible Assets) (Details) (Customer Lists [Member], USD $)	Dec. 31, 2013	Dec. 31, 2012
In Thousands, unless otherwise specified
Customer Lists [Member]	'	'
Acquired Finite-Lived Intangible Assets [Line Items]	'	'
Gross Carrying Amount	$6,494	$6,417
Accumulated Amortization	$4,649	$4,008

Acquisitions_Expected_Amortiza

Acquisitions (Expected Amortization Expense) (Details) (USD $)	Dec. 31, 2013
In Thousands, unless otherwise specified
Business Combinations [Abstract]	'
2014	$649
2015	326
2016	326
2017	308
2018	223
Thereafter	$13

Segment_and_Related_Informatio2

Segment and Related Information (Segment Information) (Details) (USD $)	12 Months Ended
In Thousands, unless otherwise specified	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting Information [Line Items]	'	'	'
Net interest income and other income from external customers	$45,315	$46,211	$46,107
Income before income taxes	11,850	11,205	10,656
Total assets	1,046,047	1,049,995	1,004,823
Capital expenditures	2,212	2,049	1,942
Banking [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Net interest income and other income from external customers	40,953	41,525	41,463
Income before income taxes	11,337	10,628	9,951
Total assets	1,035,597	1,038,262	992,252
Capital expenditures	2,205	1,986	1,938
Insurance [Member]	'	'	'
Segment Reporting Information [Line Items]	'	'	'
Net interest income and other income from external customers	4,362	4,686	4,644
Income before income taxes	513	577	705
Total assets	10,450	11,733	12,571
Capital expenditures	$7	$63	$4

Segment_and_Related_Informatio3

Segment and Related Information (Quarterly Results of Operations) (Details) (USD $)	3 Months Ended								12 Months Ended
In Thousands, except Per Share data, unless otherwise specified	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Segment Reporting [Abstract]	'	'	'	'	'	'	'	'	'	'	'
Interest income	$9,359	$9,220	$9,356	$9,666	$9,938	$10,067	$10,163	$10,271	$37,601	$40,439	$41,832
Interest expense	903	936	1,018	1,132	1,343	1,526	1,595	1,631	3,989	6,095	7,462
Net interest income	8,456	8,284	8,338	8,534	8,595	8,541	8,568	8,640	33,612	34,344	34,370
Provision for loan losses	150	150	500	650	1,300	1,125	1,125	1,125	1,450	4,675	5,435
Net interest income after provision for loan losses	8,306	8,134	7,838	7,884	7,295	7,416	7,443	7,515	32,162	29,669	28,935
Net gains on sales of securities	'	'	'	'	0	0	3	4	0	7	1
Other income	2,771	2,847	3,140	2,945	3,014	2,972	3,062	2,812	'	'	'
Other expenses and provision for income taxes	8,810	8,673	8,656	8,411	8,091	8,084	8,380	8,095	'	'	'
NET INCOME	$2,267	$2,308	$2,322	$2,418	$2,218	$2,304	$2,128	$2,236	$9,315	$8,886	$8,502
Basic earnings per share	$0.38	$0.39	$0.38	$0.41	$0.37	$0.39	$0.35	$0.38	$1.56	$1.49	$1.43
Dividends per share	$0.19	$0.19	$0.19	$0.19	$0.19	$0.19	$0.19	$0.19	$0.76	$0.76	$0.76