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STOCKHOLDERS' EQUITY AND REGULATORY MATTERS | 12 Months Ended
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Dec. 31, 2017
Regulatory Capital Requirements [Abstract] |
STOCKHOLDERS' EQUITY AND REGULATORY MATTERS | STOCKHOLDERS’ EQUITY AND REGULATORY MATTERS In January 2011, the Corporation offered stockholders the opportunity to participate in the ACNB Corporation Dividend Reinvestment and Stock Purchase Plan. The plan provides registered holders of ACNB Corporation common stock with a convenient way to purchase additional shares of common stock by permitting participants in the plan to automatically reinvest cash dividends on all or a portion of the shares owned and to make quarterly voluntary cash payments under the terms of the plan. Participation in the plan is voluntary, and there are eligibility requirements to participate in the plan. During 2017, 14,967 shares were issued under this plan with proceeds in the amount of $362,000. During 2016, 16,979 shares were issued under this plan with proceeds in the amount of $437,000. During 2015, 18,401 shares were issued under this plan with proceeds in the amount of $499,000. Proceeds are used for general corporate purposes. 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. The plan is available to employees and directors of the Bank to advance the best interests of ACNB Corporation and its shareholders. The plan provides those persons who have responsibility for its growth with additional incentive by allowing them to acquire an ownership in ACNB Corporation and thereby encouraging them to contribute to the success of the Corporation. To date, 19,301 shares were issued under this plan. The Corporation and the Bank are subject to various regulatory capital requirements administered by the federal banking agencies. 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 total and Tier 1 capital to average assets. The federal banking agencies issued final rules to implement the Basel III regulatory capital reforms and changes required by the Dodd-Frank Act. The phase-in period for community banking organizations began January 1, 2015, while larger institutions (generally those with assets of $250 billion or more) began compliance effective January 1, 2014. The final rules call for the following capital requirements:
• | a minimum ratio of common Tier 1 capital to risk-weighted assets of 4.5%;
• | a minimum ratio of Tier 1 capital to risk-weighted assets of 6.0%;
• | a minimum ratio of total capital to risk-weighted assets of 8.0%; and,
• | a minimum leverage ratio of 4.0%.
In addition, the final rules establish a common equity Tier 1 capital conservation buffer of 2.5% of risk-weighted assets applicable to all banking organizations. If a banking organization fails to hold capital above the minimum capital ratios and the capital conservation buffer, it will be subject to certain restrictions on capital distributions and discretionary bonus payments. The 2.5% at 0.625% per year phase-in period for the capital conservation and countercyclical capital buffers for all banking organizations began on January 1, 2016. Management believes, as of December 31, 2017, that the Corporation and the Bank meet all capital adequacy requirements to which they are subject. As of December 31, 2017, 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 subsequent conditions or events that management believes have changed the Bank’s category. The actual and required capital amounts and ratios were as follows:
| Actual |  | For Capital Adequacy Purposes |  | To be Well Capitalized under Prompt Corrective Action Provisions
Dollars in thousands | Amount |  | Ratio |  | Amount (1) |  | Ratio (1) |  | Amount |  | Ratio
CORPORATION |  |  |  |  |  |  |  |  |  |  |
As of December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Tier 1 leverage ratio (to average assets) | $ | 144,376 |  |  | 9.04 | % |  | $ ≥63,871 |  | ≥4.0% |  | N/A |  | N/A
Common Tier 1 risk-based capital ratio (to risk-weighted assets) | 144,376 |  |  | 12.79 |  |  | ≥50,796 |  | ≥4.5 |  | N/A |  | N/A
Tier 1 risk-based capital ratio (to risk-weighted assets) | 144,376 |  |  | 12.79 |  |  | ≥67,728 |  | ≥6.0 |  | N/A |  | N/A
Total risk-based capital ratio (to risk-weighted assets) | 158,479 |  |  | 14.04 |  |  | ≥90,304 |  | ≥8.0 |  | N/A |  | N/A
As of December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Tier 1 leverage ratio (to average assets) | $ | 121,650 |  |  | 10.06 | % |  | $ ≥48,382 |  | ≥4.0% |  | N/A |  | N/A
Common Tier 1 risk-based capital ratio (to risk-weighted assets) | 121,650 |  |  | 14.71 |  |  | ≥37,205 |  | ≥4.5 |  | N/A |  | N/A
Tier 1 risk-based capital ratio (to risk-weighted assets) | 121,650 |  |  | 14.71 |  |  | ≥49,606 |  | ≥6.0 |  | N/A |  | N/A
Total risk-based capital ratio (to risk-weighted assets) | 132,033 |  |  | 15.97 |  |  | ≥66,142 |  | ≥8.0 |  | N/A |  | N/A
BANK |  |  |  |  |  |  |  |  |  |  |
As of December 31, 2017 |  |  |  |  |  |  |  |  |  |  |
Tier 1 leverage ratio (to average assets) | $ | 138,811 |  |  | 8.70 | % |  | $ ≥68,857 |  | ≥4.0% |  | $ ≥79,822 |  | ≥5.0%
Common Tier 1 risk-based capital ratio (to risk-weighted assets) | 138,811 |  |  | 12.34 |  |  | ≥50,639 |  | ≥4.5 |  | ≥73,145 |  | ≥6.5
Tier 1 risk-based capital ratio (to risk-weighted assets) | 138,811 |  |  | 12.34 |  |  | ≥67,519 |  | ≥6.0 |  | ≥90,025 |  | ≥8.0
Total risk-based capital ratio (to risk-weighted assets) | 152,868 |  |  | 13.58 |  |  | ≥90,025 |  | ≥8.0 |  | ≥112,532 |  | ≥10.0
As of December 31, 2016 |  |  |  |  |  |  |  |  |  |  |
Tier 1 leverage ratio (to average assets) | $ | 106,540 |  |  | 8.82 | % |  | $ ≥48,316 |  | ≥4.0% |  | $ ≥60,395 |  | ≥5.0%
Common Tier 1 risk-based capital ratio (to risk-weighted assets) | 106,540 |  |  | 12.96 |  |  | ≥36,995 |  | ≥4.5 |  | ≥53,438 |  | ≥6.5
Tier 1 risk-based capital ratio (to risk-weighted assets) | 106,540 |  |  | 12.96 |  |  | ≥49,327 |  | ≥6.0 |  | ≥65,770 |  | ≥8.0
Total risk-based capital ratio (to risk-weighted assets) | 116,865 |  |  | 14.22 |  |  | ≥65,770 |  | ≥8.0 |  | ≥82,212 |  | ≥10.0
(1) | Amounts and ratios do not include capital conservation buffer.

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- Definition The entire disclosure for banks, savings institutions, and credit unions, for regulatory capital requirements imposed by the Federal Reserve System (FRB), the Federal Deposit Insurance Corporation (FDIC), the Office of Thrift Supervision (OTS) or for any state imposed capital requirements, as applicable. The disclosure may include (1) a description of regulatory capital requirements (a) for capital adequacy purposes and (b) established by the prompt corrective action provisions of Section 38 of the Federal Depository Insurance Act; (2) the actual or possible material effects of noncompliance with such requirements; (3) whether the entity is in compliance with the regulatory capital requirements including (a) required and actual ratios and amounts of Tier 1 leverage, Tier 1 risk-based, and total risk-based capital, tangible capital (for savings institutions), and Tier 3 capital for market risk (for certain banks and bank holding companies), (b) factors that may significantly affect capital adequacy; (4) the prompt corrective action category in which the entity was classified as of its most recent notification; (5) whether management believes any conditions or events since notification have changed the entity's category. Also may include additional information that might be disclosed in situations where substantial doubt about the entity's ability to continue as a going concern for a reasonable period of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1G -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958577-112826 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1C -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958572-112826 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1E -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958574-112826 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1H -URI http://asc.fasb.org/extlink&oid=84167132&loc=d3e65071-112826 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1A -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958569-112826 Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1B -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958570-112826 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1F -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958575-112826 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958568-112826 Reference 9: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 505 -Section 50 -Paragraph 1D -URI http://asc.fasb.org/extlink&oid=84167132&loc=SL5958573-112826 + Details
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