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Defined Benefit Plans | 9 Months Ended
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Sep. 30, 2017
Defined Benefit Pension Plans And Defined Benefit Postretirement Plans Disclosure [Abstract] |
Defined Benefit Plans |
(7) | Defined Benefit Plans
Mid Penn has an unfunded noncontributory defined benefit retirement plan for directors. The plan provides defined benefits based on years of service. In addition, Mid Penn sponsors a defined benefit health care plan that provides post-retirement medical benefits and life insurance to qualifying full-time employees. These health care and life insurance plans are noncontributory. A December 31 measurement date for the plans is used. The components of net periodic benefit costs from these defined benefit plans are as follows:
| Three Months Ended September 30, |
(Dollars in thousands) | Pension Benefits |  |  | Other Benefits |
| 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Service cost | $ | 9 |  |  | $ | 9 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost |  | 11 |  |  |  | 12 |  |  |  | 5 |  |  |  | 5 |
Amortization (accretion) of prior service cost |  | 4 |  |  |  | 8 |  |  |  | (6 | ) |  |  | 3 |
Net periodic benefit cost | $ | 24 |  |  | $ | 29 |  |  | $ | - |  |  | $ | 9 |
| Nine Months Ended September 30, |
(Dollars in thousands) | Pension Benefits |  |  | Other Benefits |
| 2017 |  |  | 2016 |  |  | 2017 |  |  | 2016 |
Service cost | $ | 26 |  |  | $ | 26 |  |  | $ | 3 |  |  | $ | 3 |
Interest cost |  | 32 |  |  |  | 35 |  |  |  | 15 |  |  |  | 17 |
Amortization (accretion) of prior service cost |  | 11 |  |  |  | 33 |  |  |  | (17 | ) |  |  | 94 |
Net periodic benefit cost | $ | 69 |  |  | $ | 94 |  |  | $ | 1 |  |  | $ | 114 |

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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