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Financial Derivative Instruments (Details) - Cash Flow Hedging - Designated as Hedging Instrument - USD ($) | Jun. 30, 2018 | Dec. 31, 2017 | Jun. 30, 2017
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Interest Rate Swap June 28 2021 |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 30,000,000 |  |
Fixed Rate Paid | 0.94% |  |
Fair Value | $ 1,521,000 | $ 1,154,000 | $ 952,000
Interest Rate Swap June 27 2021 |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 20,000,000 |  |
Fixed Rate Paid | 0.893% |  |
Fair Value | $ 1,041,000 | 801,000 | 671,000
Interest Rate Swap December 5 2019 |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 25,000,000 |  |
Fixed Rate Paid | 2.466% |  |
Fair Value | $ 11,000 | 0 | 0
Interest Rate Swap June 5 2020 |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 25,000,000 |  |
Fixed Rate Paid | 2.547% |  |
Fair Value | $ 19,000 | 0 | 0
Interest Rate Swap December 5 2020 |  |  |
Derivative [Line Items] |  |  |
Notional Amount | $ 25,000,000 |  |
Fixed Rate Paid | 2.603% |  |
Fair Value | $ 24,000 | 0 | 0
Interest Rate Swap |  |  |
Derivative [Line Items] |  |  |
Notional Amount | 125,000,000 |  |
Fair Value | $ 2,616,000 | $ 1,955,000 | $ 1,623,000

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