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Defined Benefit Plans (Tables) | 6 Months Ended | 12 Months Ended
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Jun. 30, 2017 | Dec. 31, 2016
Schedule of Amounts Recognized in Balance Sheet |  | The amount recognized in the consolidated balance sheet at December 31, 2016 and 2015, is as follows:
(Dollars in thousands) |  | 2016 |  |  | 2015 |
Accrued benefit liability |  | $ | 540 |  |  | $ | 572 |
Schedule of Amounts Recognized in Other Comprehensive (Loss) Income |  | The amounts recognized in accumulated other comprehensive (loss) income consist of:
|  | December 31, |
(Dollars in thousands) |  | 2016 |  |  | 2015 |
Net gain, pretax |  | $ | (31 | ) |  | $ | (47 | )
Net prior service cost, pretax |  |  | (209 | ) |  |  | (244 | )
Schedule of Net Periodic (Income) Benefit Costs | The components of net periodic benefit costs from these defined benefit plans are as follows:
|  | Three Months Ended June 30, |
(Dollars in thousands) |  | Pension Benefits |  |  | Other Benefits |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Service cost |  | $ | 9 |  |  | $ | 8 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost |  |  | 11 |  |  |  | 11 |  |  |  | 5 |  |  |  | 5 |
Amortization (accretion) of prior service cost |  |  | 4 |  |  |  | 8 |  |  |  | (6 | ) |  |  | 6 |
Net periodic benefit cost |  | $ | 24 |  |  | $ | 27 |  |  | $ | — |  |  | $ | 12 |
|  | Six Months Ended June 30, |
(Dollars in thousands) |  | Pension Benefits |  |  | Other Benefits |
|  | 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Service cost |  | $ | 18 |  |  | $ | 17 |  |  | $ | 2 |  |  | $ | 2 |
Interest cost |  |  | 22 |  |  |  | 23 |  |  |  | 10 |  |  |  | 11 |
Amortization (accretion) of prior service cost |  |  | 7 |  |  |  | 25 |  |  |  | (12 | ) |  |  | 91 |
Net periodic benefit cost |  | $ | 47 |  |  | $ | 65 |  |  | $ | — |  |  | $ | 104 |
| The components of net periodic postretirement (income) benefit cost for 2016, 2015 and 2014 are as follows:
(Dollars in thousands) |  | 2016 |  |  | 2015 |  |  | 2014 |
Service cost |  | $ | 4 |  |  | $ | 13 |  |  | $ | 13 |
Interest cost |  |  | 23 |  |  |  | 32 |  |  |  | 38 |
Amortization of prior service cost |  |  | (35 | ) |  |  | — |  |  |  | (1 | )
Net periodic postretirement (income) benefit cost |  | $ | (8 | ) |  | $ | 45 |  |  | $ | 50 |
Schedule of Assumptions Used |  | Assumptions used in the measurement of Mid Penn’s benefit obligations at December 31, 2016 and 2015 are as follows:
|  | 2016 |  |  | 2015 |
Weighted-average assumptions: |  |  |  |  |  |  |  |
Discount rate |  |  | 4.00 | % |  |  | 4.25 | %
Rate of compensation increase |  |  | 3.00 | % |  |  | 3.25 | %
Assumptions used in the measurement of Mid Penn’s net periodic benefit cost for the years ended December 31, 2016, 2015 and 2014 are as follows:
|  | 2016 |  |  | 2015 |  |  | 2014 |
Weighted-average assumptions: |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  | 4.25 | % |  |  | 4.00 | % |  |  | 4.75 | %
Rate of compensation increase |  |  | 3.25 | % |  |  | 3.00 | % |  |  | 3.75 | %
Schedule of Health Care Cost Trend Rates |  | Assumed health care cost trend rates at December 31, 2016, 2015 and 2014 are as follows:
|  | 2016 |  |  | 2015 |  |  | 2014 |
Health care cost trend rate assumed for next year |  |  | 6.00 | % |  |  | 5.50 | % |  |  | 6.50 | %
Rate to which the cost trend rate is assumed to decline (the ultimate trend rate) |  |  | 5.50 | % |  |  | 5.50 | % |  |  | 5.50 | %
Year that the rate reaches the ultimate trend rate |  |  | 2018 |  |  |  | 2016 |  |  |  | 2016 |
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates |  | Assumed health care cost trend rates have a significant effect on the amounts reported for the health care Plans. At December 31, 2016, a one-percentage-point change in assumed health care cost trend rates would have the following effects:
|  | One-Percentage Point |
(Dollars in thousands) |  | Increase |  |  | Decrease |
Effect on total of service and interest cost |  | $ | — |  |  | $ | — |
Effect on accumulated postretirement benefit obligation |  |  | 3 |  |  |  | 3 |
Schedule of Expected Benefit Payments |  | Mid Penn expects to contribute $73,000 to its life and health benefit Plans in 2017. The following table shows the estimated benefit payments for future periods.
(Dollars in thousands) |  |  |
1/1/2017 to 12/31/2017 |  | $ | 73 |
1/1/2018 to 12/31/2018 |  |  | 64 |
1/1/2019 to 12/31/2019 |  |  | 61 |
1/1/2020 to 12/31/2020 |  |  | 56 |
1/1/2021 to 12/31/2021 |  |  | 30 |
1/1/2022 to 12/31/2026 |  |  | 156 |
Defined Benefit Postretirement Health And Life Coverage [Member] |  |
Schedule of Net Funded Status |  | The following tables provide a reconciliation of the changes in the Plan’s health and life insurance benefit obligations and fair value of Plan assets for the years ended December 31, 2016 and 2015, and a statement of the funded status at December 31, 2016 and 2015.
|  | December 31, |
(Dollars in thousands) |  | 2016 |  |  | 2015 |
Change in benefit obligations: |  |  |  |  |  |  |  |
Benefit obligations, January 1 |  | $ | 572 |  |  | $ | 861 |
Service cost |  |  | 4 |  |  |  | 13 |
Interest cost |  |  | 23 |  |  |  | 32 |
Change in experience |  |  | 2 |  |  |  | (24 | )
Change in assumptions |  |  | 13 |  |  |  | (4 | )
Change due to plan amendment |  |  | — |  |  |  | (244 | )
Benefit payments |  |  | (74 | ) |  |  | (62 | )
Benefit obligations, December 31 |  | $ | 540 |  |  | $ | 572 |
Change in fair value of plan assets: |  |  |  |  |  |  |  |
Fair value of plan assets, January 1 |  | $ | — |  |  | $ | — |
Employer contributions |  |  | 74 |  |  |  | 62 |
Benefit payments |  |  | (74 | ) |  |  | (62 | )
Fair value of plan assets, December 31 |  | $ | — |  |  | $ | — |
Funded status at year end |  | $ | (540 | ) |  | $ | (572 | )
Director's Retirement Plan [Member] |  |
Schedule of Net Funded Status |  | The following tables provide a reconciliation of the changes in the directors’ defined benefit Plan’s benefit obligations and fair value of Plan assets for the years ended December 31, 2016 and 2015 and a statement of the status at December 31, 2016 and 2015. This Plan is unfunded.
|  | December 31, |
(Dollars in thousands) |  | 2016 |  |  | 2015 |
Change in benefit obligations: |  |  |  |  |  |  |  |
Benefit obligations, January 1 |  | $ | 1,150 |  |  | $ | 1,186 |
Service cost |  |  | 34 |  |  |  | 33 |
Interest cost |  |  | 46 |  |  |  | 45 |
Actuarial gain |  |  | (13 | ) |  |  | (8 | )
Change in assumptions |  |  | (4 | ) |  |  | (16 | )
Benefit payments |  |  | (91 | ) |  |  | (90 | )
Benefit obligations, December 31 |  | $ | 1,122 |  |  | $ | 1,150 |
Change in fair value of plan assets: |  |  |  |  |  |  |  |
Fair value of plan assets, January 1 |  | $ | — |  |  | $ | — |
Employer contributions |  |  | 91 |  |  |  | 90 |
Benefit payments |  |  | (91 | ) |  |  | (90 | )
Fair value of plan assets, December 31 |  | $ | — |  |  | $ | — |
Funded status at year end |  | $ | (1,122 | ) |  | $ | (1,150 | )
Schedule of Amounts Recognized in Balance Sheet |  | Amounts recognized in the consolidated balance sheet at December 31, 2016 and 2015 are as follows:
(Dollars in thousands) |  | 2016 |  |  | 2015 |
Accrued benefit liability |  | $ | 1,122 |  |  | $ | 1,150 |
Schedule of Amounts Recognized in Other Comprehensive (Loss) Income |  | Amounts recognized in accumulated other comprehensive income (loss) consist of:
|  | December 31, |
(Dollars in thousands) |  | 2016 |  |  | 2015 |
Net prior service cost, pretax |  | $ | 43 |  |  | $ | 64 |
Net loss, pretax |  |  | 60 |  |  |  | 77 |
Schedule of Net Periodic (Income) Benefit Costs |  | The components of net periodic retirement cost for 2016, 2015 and 2014 are as follows:
(Dollars in thousands) |  | 2016 |  |  | 2015 |  |  | 2014 |
Service cost |  | $ | 34 |  |  | $ | 33 |  |  | $ | 33 |
Interest cost |  |  | 46 |  |  |  | 45 |  |  |  | 51 |
Amortization of prior-service cost |  |  | 22 |  |  |  | 22 |  |  |  | 22 |
Net periodic retirement cost |  | $ | 102 |  |  | $ | 100 |  |  | $ | 106 |
Schedule of Assumptions Used |  | Assumptions used in the measurement of Mid Penn’s benefit obligations at December 31, 2016 and 2015 are as follows:
|  | 2016 |  |  | 2015 |
Weighted-average assumptions: |  |  |  |  |  |  |  |
Discount rate |  |  | 4.00 | % |  |  | 4.25 | %
Change in consumer price index |  |  | 2.00 | % |  |  | 2.25 | %
Assumptions used in the measurement of Mid Penn’s net periodic benefit cost for the years ended December 31, 2016, 2015 and 2014 are as follows:
|  | 2016 |  |  | 2015 |  |  | 2014 |
Weighted-average assumptions: |  |  |  |  |  |  |  |  |  |  |  |
Discount rate |  |  | 4.25 | % |  |  | 4.00 | % |  |  | 4.75 | %
Change in consumer price index |  |  | 2.25 | % |  |  | 2.25 | % |  |  | 2.75 | %
Schedule of Expected Benefit Payments |  | Mid Penn expects to contribute $94,000 to its retirement Plan in 2017. The following table shows the estimated benefit payments for future periods.
(Dollars in thousands) |  |  |
1/1/2017 to 12/31/2017 |  | $ | 94 |
1/1/2018 to 12/31/2018 |  |  | 96 |
1/1/2019 to 12/31/2019 |  |  | 96 |
1/1/2020 to 12/31/2020 |  |  | 98 |
1/1/2021 to 12/31/2021 |  |  | 108 |
1/1/2022 to 12/31/2026 |  |  | 464 |

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- Definition Tabular disclosure of the net gain (loss) and net prior service cost or credit recognized in other comprehensive income (loss) for the period for pension plans and/or other employee benefit plans, and reclassification adjustments of other comprehensive income (loss) for the period, as those amounts, including amortization of the net transition asset or obligation, are recognized as components of net periodic benefit cost. + 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 (i) -URI http://asc.fasb.org/extlink&oid=82843861&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=82843861&loc=d3e1928-114920 + Details
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