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Derivative Instruments Schedule of Interest Rate Swaps by Maturity (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended
--- | --- | ---
Sep. 30, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |
Derivative, Fair Value, Net | $ 22,716 | $ 6,929
Short [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | 577,430 | 607,571
Derivative, Fair Value, Net | $ 18,176 | $ 6,347
Weighted Average Pay Rate | 2.17% | 1.77%
Weighted Average Receive Rate | 2.33% | 1.40%
Derivative, Average Remaining Maturity | 5 years 282 days | 4 years 197 days
Short [Member] | Year 2018 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional |  | $ 65,990
Derivative, Fair Value, Net |  | $ 187
Weighted Average Pay Rate |  | 0.97%
Weighted Average Receive Rate |  | 1.38%
Derivative, Average Remaining Maturity |  | 157 days
Short [Member] | Year 2019 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional |  | $ 19,540
Derivative, Fair Value, Net |  | $ 165
Weighted Average Pay Rate |  | 1.41%
Weighted Average Receive Rate |  | 1.60%
Derivative, Average Remaining Maturity |  | 1 year 186 days
Short [Member] | Year 2020 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 86,000 | $ 131,900
Derivative, Fair Value, Net | $ 1,529 | $ 1,514
Weighted Average Pay Rate | 1.60% | 1.60%
Weighted Average Receive Rate | 2.33% | 1.41%
Derivative, Average Remaining Maturity | 1 year 209 days | 2 years 142 days
Short [Member] | Year 2021 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 133,400 | $ 131,400
Derivative, Fair Value, Net | $ 3,332 | $ 1,194
Weighted Average Pay Rate | 1.89% | 1.88%
Weighted Average Receive Rate | 2.34% | 1.40%
Derivative, Average Remaining Maturity | 2 years 241 days | 3 years 150 days
Short [Member] | Year 2022 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 68,480 | $ 79,044
Derivative, Fair Value, Net | $ 2,245 | $ 736
Weighted Average Pay Rate | 2.00% | 1.97%
Weighted Average Receive Rate | 2.34% | 1.39%
Derivative, Average Remaining Maturity | 3 years 250 days | 4 years 175 days
Short [Member] | Year 2023 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 23,600 | $ 54,200
Derivative, Fair Value, Net | $ 1,193 | $ 873
Weighted Average Pay Rate | 1.88% | 1.93%
Weighted Average Receive Rate | 2.34% | 1.37%
Derivative, Average Remaining Maturity | 4 years 222 days | 5 years 172 days
Short [Member] | Year 2024 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 8,900 | $ 8,900
Derivative, Fair Value, Net | $ 454 | $ 142
Weighted Average Pay Rate | 1.99% | 1.99%
Weighted Average Receive Rate | 2.34% | 1.34%
Derivative, Average Remaining Maturity | 5 years 186 days | 6 years 95 days
Short [Member] | Year 2025 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 47,722 | $ 15,322
Derivative, Fair Value, Net | $ 1,398 | $ 196
Weighted Average Pay Rate | 2.57% | 2.04%
Weighted Average Receive Rate | 2.33% | 1.37%
Derivative, Average Remaining Maturity | 6 years 153 days | 7 years 47 days
Short [Member] | Year 2026 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 40,885 | $ 40,885
Derivative, Fair Value, Net | $ 4,189 | $ 2,230
Weighted Average Pay Rate | 1.63% | 1.63%
Weighted Average Receive Rate | 2.34% | 1.36%
Derivative, Average Remaining Maturity | 7 years 351 days | 8 years 259 days
Short [Member] | Year 2027 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 30,000 | $ 48,010
Derivative, Fair Value, Net | $ 1,659 | $ 235
Weighted Average Pay Rate | 2.29% | 2.30%
Weighted Average Receive Rate | 2.35% | 1.40%
Derivative, Average Remaining Maturity | 8 years 217 days | 9 years 139 days
Short [Member] | Year 2028 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 126,063 |
Derivative, Fair Value, Net | $ 1,949 |
Weighted Average Pay Rate | 2.92% |
Weighted Average Receive Rate | 2.33% |
Derivative, Average Remaining Maturity | 9 years 300 days |
Short [Member] | Year 2043 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 12,380 | $ 12,380
Derivative, Fair Value, Net | $ 228 | $ (1,125)
Weighted Average Pay Rate | 2.99% | 2.99%
Weighted Average Receive Rate | 2.33% | 1.41%
Derivative, Average Remaining Maturity | 24 years 231 days | 25 years 139 days
Long [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional |  | $ 9,700
Derivative, Fair Value, Net |  | $ 563
Weighted Average Pay Rate |  | 1.36%
Weighted Average Receive Rate |  | 3.00%
Derivative, Average Remaining Maturity |  | 7 years 197 days
Long [Member] | Year 2025 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional |  | $ 9,700
Derivative, Fair Value, Net |  | $ 563
Weighted Average Pay Rate |  | 1.36%
Weighted Average Receive Rate |  | 3.00%
Derivative, Average Remaining Maturity |  | 7 years 197 days

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