| Component: (Network and Table) | |
|---|---|
| Network | 099 - Disclosure - Note 13 - Employee and Postretirement Benefit Plans - Estimated Future Benefit Payments (Details) (http://www.cnbankpa.com/20161231/role/statement-note-13-employee-and-postretirement-benefit-plans-estimated-future-benefit-payments-details) |
| Table | Statement [Table] |
| Reporting Entity [Axis] | 0000810958 (http://www.sec.gov/CIK) |
| Scenario [Axis] | Scenario, Unspecified [Domain] |
| Statement [Line Items] | Period [Axis] | |
|---|---|---|
2016-12-31 | ||
| Defined Benefit Plans and Other Postretirement Benefit Plans [Axis] | ||
| Pension Plan [Member] | Other Postretirement Benefit Plan [Member] | |
2017 | ||
2018 | ||
2019 | ||
2020 | ||
2021 | ||
2022-2026 | ||