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Employee benefit plans (Tables) | 12 Months Ended
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Dec. 31, 2013
Compensation And Retirement Disclosure [Abstract] |
Schedule of Change in Projected Benefit Obligation and Change in Plan Assets |
|  | Pension Benefits |  |  | Postretirement Life Insurance Benefits |
December 31, |  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Change in benefit obligation: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Benefit obligation, beginning |  | $ | 15,506 |  |  | $ | 14,450 |  |  | $ | 3,193 |  |  | $ | 3,004 |
Service cost |  |  |  |  |  |  |  |  |  |  | 35 |  |  |  | 48 |
Interest cost |  |  | 646 |  |  |  | 673 |  |  |  | 111 |  |  |  | 139 |
Plan curtailment |  |  |  |  |  |  |  |  |  |  | (2,764 | ) |  |  |  |
Change in experience |  |  | 99 |  |  |  | 88 |  |  |  |  |  |  |  | 4 |
Change in assumptions |  |  | (1,324 | ) |  |  | 978 |  |  |  |  |  |  |  | 145 |
Benefits paid |  |  | (716 | ) |  |  | (683 | ) |  |  | (575 | ) |  |  | (147 | )
Benefit obligation, ending |  |  | 14,211 |  |  |  | 15,506 |  |  |  |  |  |  |  | 3,193 |
Change in plan assets: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Fair value of plan assets, beginning |  |  | 11,343 |  |  |  | 11,026 |  |  |  |  |  |  |  |  |
Actual return on plan assets |  |  | 1,623 |  |  |  | 637 |  |  |  |  |  |  |  |  |
Employer contributions |  |  | 167 |  |  |  | 363 |  |  |  |  |  |  |  |  |
Benefits paid |  |  | (716 | ) |  |  | (683 | ) |  |  |  |  |  |  |  |
Fair value of plan assets, ending |  |  | 12,417 |  |  |  | 11,343 |  |  |  |  |  |  |  |  |
Funded status at end of year |  | $ | (1,794 | ) |  | $ | (4,163 | ) |  | $ |  |  |  | $ | (3,193 | )
Schedule of Amounts Recognized in Balance Sheet | Amounts recognized in the balance sheet are as follows:
|  | Pension Benefits |  |  | Postretirement Life Insurance Benefits |
December 31, |  | 2013 |  |  | 2012 |  |  | 2013 |  |  | 2012 |
Liabilities |  | $ | 1,794 |  |  | $ | 4,163 |  |  | $ |  |  |  | $ | 3,193 |
Amounts recognized in the accumulated other comprehensive loss consist of: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net actuarial loss (gain) |  |  | (3,883 | ) |  |  | (6,252 | ) |  |  |  |  |  |  | (1,273 | )
Deferred taxes |  |  | 1,359 |  |  |  | 2,091 |  |  |  |  |  |  |  | 620 |
Net amount recognized |  | $ | (2,524 | ) |  | $ | (4,161 | ) |  | $ |  |  |  | $ | (653 | )
Components of Net Periodic Pension Cost and Other Amounts Recognized in Other Comprehensive Income | Components of net periodic pension cost and other amounts recognized in other comprehensive income are as follows:
|  | Pension Benefits |
Years Ended December 31, |  | 2013 |  |  | 2012 |  |  | 2011 |
Net periodic pension cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  |  |  |  |  |  |  |  |  |  |  |
Interest cost |  | $ | 646 |  |  | $ | 673 |  |  | $ | 700 |
Expected return on plan assets |  |  | (825 | ) |  |  | (809 | ) |  |  | (903 | )
Amortization of prior service cost |  |  |  |  |  |  |  |  |  |  |  |
Amortization of unrecognized net loss |  |  | 180 |  |  |  | 136 |  |  |  | 82 |
Curtailment loss |  |  |  |  |  |  |  |  |  |  |  |
Net periodic pension cost |  | $ | 1 |  |  | $ |  |  |  | $ | (121 | )
Other changes in plan assets and benefit obligations recognized in other comprehensive income (loss): |  |  |  |  |  |  |  |  |  |  |  |
Net loss (gain) |  |  | (2,369 | ) |  |  | 739 |  |  |  | 1,351 |
Prior service cost |  |  |  |  |  |  |  |  |  |  |  |
Deferred tax |  |  | 805 |  |  |  | (251 | ) |  |  | (459 | )
Total recognized in other comprehensive income |  |  | (1,564 | ) |  |  | 488 |  |  |  | 892 |
Total recognized in net period pension cost and other comprehensive income |  | $ | (1,563 | ) |  | $ | 488 |  |  | $ | 771 |
|  | Postretirement Life Insurance Benefits |
Years Ended December 31, |  | 2013 |  |  | 2012 |  |  | 2011 |
Components of net periodic pension cost: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 35 |  |  | $ | 48 |  |  | $ | 43 |
Interest cost |  |  | 111 |  |  |  | 139 |  |  |  | 147 |
Amortization of prior service cost |  |  |  |  |  |  |  |  |  |  | 7 |
Amortization of unrecognized net gain |  |  | 96 |  |  |  | 111 |  |  |  | 105 |
Net periodic other benefit cost |  | $ | 242 |  |  | $ | 298 |  |  | $ | 302 |
Changes in plan assets and benefit obligations recognized in other comprehensive income: |  |  |  |  |  |  |  |  |  |  |  |
Net loss (gain) |  |  | (1,273 | ) |  |  | 185 |  |  |  | 148 |
Prior service cost |  |  |  |  |  |  |  |  |  |  | 8 |
Amortization of prior service cost |  |  |  |  |  |  |  |  |  |  | (7 | )
Deferred tax |  |  | 620 |  |  |  | (63 | ) |  |  | (53 | )
Total recognized in other comprehensive income |  |  | (653 | ) |  |  | 122 |  |  |  | 96 |
Total recognized in net period pension cost and other comprehensive income |  | $ | (411 | ) |  | $ | 420 |  |  | $ | 398 |
Schedule of Weighted-Average Assumptions Used to Determine Benefit Obligations | Weighted-average assumptions used to determine benefit obligations were as follows:
|  | Pension Benefits |  |  | Postretirement Life Insurance Benefits |
December 31, |  | 2013 |  |  | 2012 |  |  | 2013 |  | 2012 |
Discount rate |  |  | 5.00 | % |  |  | 4.25 | % |  |  |  |  | 4.25 | %
Expected long-term return on plan assets |  |  | 7.50 | % |  |  | 7.50 | % |  |  |  |  |  |
Rate of compensation increase |  |  |  |  |  |  |  |  |  |  |  |  | 3.00 | %
Schedule of Pension Plan Weighted-Average Asset Allocations | The Company’s pension plan weighted-average asset allocations at December 31, 2013 and 2012, by asset category are as follows:
December 31, |  | 2013 |  |  | 2012 |
Asset Category: |  |  |  |  |  |  |  |
Equity securities |  |  | 59.9 | % |  |  | 56.2 | %
Corporate bonds |  |  | 16.8 |  |  |  | 18.9 |
U.S. Government securities |  |  | 20.8 |  |  |  | 21.2 |
Cash and cash equivalents |  |  | 2.5 |  |  |  | 3.7 |
|  |  | 100.0 | % |  |  | 100.0 | %
Fair Value Measurement of Pension Plan Assets | Fair Value Measurement of pension plan assets at December 31, 2013 and 2012 is as follows:
December 31, 2013 |  | Total |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Observable Inputs (Level 2) |  |  | Significant Observable Inputs (Level 3)
Cash |  | $ | 316 |  |  | $ | 316 |  |  |  |  |  |  |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. large cap |  |  | 6,993 |  |  |  | 6,993 |  |  |  |  |  |  |
International |  |  | 442 |  |  |  | 442 |  |  |  |  |  |  |
Fixed income securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasuries |  |  | 995 |  |  |  |  |  |  | $ | 995 |  |  |
U.S. Government agencies |  |  | 1,579 |  |  |  |  |  |  |  | 1,579 |  |  |
Corporate bonds |  |  | 2,092 |  |  |  |  |  |  |  | 2,092 |  |  |
Total |  | $ | 12,417 |  |  | $ | 7,751 |  |  | $ | 4,666 |  |  |
December 31, 2012 |  | Total |  |  | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  | Significant Observable Inputs (Level 2) |  |  | Significant Observable Inputs (Level 3)
Cash |  | $ | 419 |  |  | $ | 419 |  |  |  |  |  |  |
Equity securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. large cap |  |  | 6,068 |  |  |  | 6,068 |  |  |  |  |  |  |
International |  |  | 307 |  |  |  | 307 |  |  |  |  |  |  |
Fixed income securities: |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Treasuries |  |  | 1,024 |  |  |  |  |  |  | $ | 1,024 |  |  |
U.S. Government agencies |  |  | 1,380 |  |  |  |  |  |  |  | 1,380 |  |  |
Corporate bonds |  |  | 2,145 |  |  |  |  |  |  |  | 2,145 |  |  |
Total |  | $ | 11,343 |  |  | $ | 6,794 |  |  | $ | 4,549 |  |  |
Schedule of Estimated Future Benefit Payments Expected to be Paid | The following benefit payments, which reflect expected future service, as appropriate, are expected to be paid in the next five years and in the aggregate for the five years thereafter:
|  | Pension Benefits |
2014 |  | $ | 729 |
2015 |  |  | 781 |
2016 |  |  | 793 |
2017 |  |  | 811 |
2018 |  |  | 863 |
Thereafter |  | $ | 4,484 |

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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + 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 (d)(5) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + 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 (c) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on plan assets. + 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 (k) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + 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 (f) -URI http://asc.fasb.org/extlink&oid=28361610&loc=d3e1928-114920 + Details
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