Borrowed Funds (Contractual Maturities of All Long Term Borrowings) (Details) - USD ($) $ in Thousands |
Sep. 30, 2017 |
Dec. 31, 2016 |
|---|---|---|
| Debt Instrument [Line Items] | ||
| Due in 2018 | $ 20,000 | $ 20,000 |
| Due in 2019 | 20,000 | 20,000 |
| Due in 2020 | 30,000 | 30,000 |
| Due in 2021 | 20,000 | 20,000 |
| Thereafter | 30,929 | 41,737 |
| Total long-term debt | 120,929 | $ 131,737 |
| Fixed Rate [Member] | ||
| Debt Instrument [Line Items] | ||
| Due in 2018 | 20,000 | |
| Due in 2019 | 20,000 | |
| Due in 2020 | 30,000 | |
| Due in 2021 | 20,000 | |
| Thereafter | 0 | |
| Total long-term debt | 90,000 | |
| Floating Rate [Member] | ||
| Debt Instrument [Line Items] | ||
| Due in 2018 | 0 | |
| Due in 2019 | 0 | |
| Due in 2020 | 0 | |
| Due in 2021 | 0 | |
| Thereafter | 30,929 | |
| Total long-term debt | $ 30,929 |