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Fair Value of Financial Instruments - Quantative Information About Unobservable Inputs (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Dec. 31, 2016 | Dec. 31, 2017
Derivative, fair value | $ (72) |  | $ (354)
Significant Unobservable Inputs (Level 3) | Minimum |  |  |
IRLC - Loan closing rates | 42.00% | 39.00% |
Significant Unobservable Inputs (Level 3) | Maximum |  |  |
IRLC - Loan closing rates | 100.00% | 100.00% |
IRLCs |  |  |
Derivative, fair value | $ 383 |  | 551
IRLCs | Quoted Prices in Active Markets for Identical Assets (Level 1) |  |  |
Derivative, fair value | 0 |  | 0
IRLCs | Significant Other Observable Inputs (Level 2) |  |  |
Derivative, fair value | 0 |  | 0
IRLCs | Significant Unobservable Inputs (Level 3) |  |  |
Derivative, fair value | 383 |  | 551
IRLCs Fair Value | $ 383 |  | $ 551
Other securities Valuation Technique | Discounted cash flow | Discounted cash flow |
Other securities Unobservable Inputs | Loan closing rates | Loan closing rates |

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