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EMPLOYEE BENEFIT PLANS (Narrative) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
401(k) PLAN: |  |  |
Contributions to charged to operations | $ 277 | 229 |
Employer match percentage | 2.00% |  |
Maximum percent of salary | 1.00% |  |
Allowance For Loan Losses String | 4.00% |  |
AmeriServ Financial, Inc. common stock and Trust Preferred securities held | 914 |  |
Pension Plans [Member] |  |  |
PENSION PLANS: |  |  |
Minimum number of annual hours | 1000 hours |  |
Vesting term | 5 years |  |
AmeriServ Financial, Inc. common stock held | 626 |  |
Maximum percent of plan assets comprised of AmeriServ Financial, Inc. common stock | 10.00% |  |
Estimated net loss that will be amortized from accumulated other comprehensive income (loss) | 1,363 |  |
Estimated prior service cost that will be amortized from accumulated other comprehensive income (loss) | (20) |  |
Estimated transition asset that will be amortized from accumulated other comprehensive income (loss) | 8 |  |
Expected return on plan assets | 8.00% | 8.00% | 8.00%
Expected contribution in 2013 | $ 2,500 |  |
Pension Plans [Member] | Domestic Equities [Member] |  |  |
PENSION PLANS: |  |  |
Target allocation | 60.00% |  |
Target allocation, minimum | 50.00% |  |
Target allocation, maximum | 60.00% |  |
Pension Plans [Member] | Fixed Income Securities [Member] |  |  |
PENSION PLANS: |  |  |
Target allocation, minimum | 40.00% |  |
Target allocation, maximum | 50.00% |  |

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- Definition The amounts in accumulated other comprehensive income related to gains and losses that are not recognized immediately and are expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph s -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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