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Derivative Instruments Schedule of Interest Rate Swaps by Maturity (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2018 | Dec. 31, 2017
Derivative [Line Items] |  |
Derivative, Fair Value, Net | $ 7,652 | $ 6,929
Short [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | 652,996 | 607,571
Derivative, Fair Value, Net | $ 11,461 | $ 6,347
Weighted Average Pay Rate | 2.15% | 1.77%
Weighted Average Receive Rate | 1.86% | 1.40%
Derivative, Average Remaining Maturity | 5 years 113 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 | $ 1,372 | $ 1,514
Weighted Average Pay Rate | 1.60% | 1.60%
Weighted Average Receive Rate | 1.76% | 1.41%
Derivative, Average Remaining Maturity | 2 years 26 days | 2 years 142 days
Short [Member] | Year 2021 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 161,400 | $ 131,400
Derivative, Fair Value, Net | $ 2,428 | $ 1,194
Weighted Average Pay Rate | 2.03% | 1.88%
Weighted Average Receive Rate | 1.90% | 1.40%
Derivative, Average Remaining Maturity | 3 years 51 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 | $ 1,511 | $ 736
Weighted Average Pay Rate | 2.00% | 1.97%
Weighted Average Receive Rate | 1.80% | 1.39%
Derivative, Average Remaining Maturity | 4 years 69 days | 4 years 175 days
Short [Member] | Year 2023 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 150,466 | $ 54,200
Derivative, Fair Value, Net | $ 1,984 | $ 873
Weighted Average Pay Rate | 2.38% | 1.93%
Weighted Average Receive Rate | 1.82% | 1.37%
Derivative, Average Remaining Maturity | 4 years 361 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 | $ 316 | $ 142
Weighted Average Pay Rate | 1.99% | 1.99%
Weighted Average Receive Rate | 1.69% | 1.34%
Derivative, Average Remaining Maturity | 6 years 4 days | 6 years 95 days
Short [Member] | Year 2025 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 57,822 | $ 15,322
Derivative, Fair Value, Net | $ 361 | $ 196
Weighted Average Pay Rate | 2.62% | 2.04%
Weighted Average Receive Rate | 1.97% | 1.37%
Derivative, Average Remaining Maturity | 6 years 339 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 | $ 3,423 | $ 2,230
Weighted Average Pay Rate | 1.63% | 1.63%
Weighted Average Receive Rate | 1.87% | 1.36%
Derivative, Average Remaining Maturity | 8 years 168 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 | $ 934 | $ 235
Weighted Average Pay Rate | 2.29% | 2.30%
Weighted Average Receive Rate | 1.79% | 1.40%
Derivative, Average Remaining Maturity | 9 years 37 days | 9 years 139 days
Short [Member] | Year 2028 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 36,663 |
Derivative, Fair Value, Net | $ (397) |
Weighted Average Pay Rate | 2.89% |
Weighted Average Receive Rate | 2.01% |
Derivative, Average Remaining Maturity | 9 years 339 days |
Short [Member] | Year 2043 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 12,380 | $ 12,380
Derivative, Fair Value, Net | $ (471) | $ (1,125)
Weighted Average Pay Rate | 2.99% | 2.99%
Weighted Average Receive Rate | 1.83% | 1.41%
Derivative, Average Remaining Maturity | 25 years 47 days | 25 years 139 days
Long [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 22,700 | $ 9,700
Derivative, Fair Value, Net | $ 193 | $ 563
Weighted Average Pay Rate | 2.06% | 1.36%
Weighted Average Receive Rate | 2.80% | 3.00%
Derivative, Average Remaining Maturity | 4 years 307 days | 7 years 197 days
Long [Member] | Year 2021 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 13,000 |
Derivative, Fair Value, Net | $ (1) |
Weighted Average Pay Rate | 2.31% |
Weighted Average Receive Rate | 2.66% |
Derivative, Average Remaining Maturity | 3 years 4 days |
Long [Member] | Year 2025 [Member] | Interest Rate Swap [Member] |  |
Derivative [Line Items] |  |
Derivative notional | $ 9,700 | $ 9,700
Derivative, Fair Value, Net | $ 194 | $ 563
Weighted Average Pay Rate | 1.72% | 1.36%
Weighted Average Receive Rate | 3.00% | 3.00%
Derivative, Average Remaining Maturity | 7 years 110 days | 7 years 197 days

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