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Employee Benefit Plans (Details Textual) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2012 Service Age | Dec. 31, 2011 | Dec. 31, 2010
Employee Benefit Plans (Additional Textual) [Abstract] |  |  |
Employee pretax contribution percentage | 100.00% |  |
Employees compensation | 50.00% |  |
Corporations contributions | $ 397 | $ 385 | $ 350
Profit sharing contributions | 6.00% |  |
Compensation percentage in excess of specified amount | 5.70% |  |
Excess of compensation | 110 |  |
Recognized profit sharing expense | 783 | 667 | 641
Obligations of other liabilities | 3,792 | 3,276 |
Expenses related employee benefit plans | 728 | 647 | 227
Obligations under survivor benefit plan | 813 | 686 |
Other liabilities related to survivor benefit plan | 127 | 106 | 21
Employee Retirement Health Care Benefits Plan | 60 |  |
Minimum service period for participation in benefit plan | 30 |  |
Accumulated benefit obligation | 2,224 | 1,674 |
Amortized from accumulated other comprehensive income into net periodic benefit cost | 54 | 7 |
Weighted average discount rate net periodic benefit cost | 4.29% | 5.50% | 5.75%
Weighted average rate accrued benefit obligations | 3.88% | 4.29% | 5.50%
Expected costs of benefit | 5.00% |  |
Percent rate of increase in the health care trend | 1.00% |  |
Increase in health care trend rates | 289 |  |
Increase service and interest costs | 43 |  |
Percent rate of decrease in the health care trend | 1.00% |  |
Decrease in health care trend rates | 247 |  |
Decrease service and interest costs | $ 34 |  |
Maximum [Member] |  |  |
Employee Benefit Plans (Textual) [Abstract] |  |  |
Employee contribution percentage | 3.00% |  |
Total contributed by employee percentage | 4.00% |  |
Qualifying dependents age group | 65 |  |
Minimum [Member] |  |  |
Employee Benefit Plans (Textual) [Abstract] |  |  |
Employee contribution percentage | 1.00% |  |
Total contributed | 1.00% |  |
Qualifying dependents age group | 60 |  |

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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph e -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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