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Small Business Lending Fund - Narrative (Details) - USD ($) |  |  |  | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | --- | --- | ---
Mar. 06, 2017 | Jan. 30, 2017 | Feb. 04, 2016 | Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2017
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  | 0 |  | 0 |  |  |  | 0
Preferred stock, dividend rate (as a percent) |  |  | 9.00% |  |  |  |  |  | 1.00% |
Preferred stock dividends |  |  |  | $ 0 | $ 0 | $ 0 | $ 195,000 | $ 1,022,000 | $ 120,000 |
Proceeds from issuance of common stock |  |  |  |  |  | 1,528,306 | 37,840,224 |  |  |
Payments for redemption of preferred stock | $ 12,000,000 |  |  |  |  |  |  |  |  |
Payment of dividends on preferred stock | $ 195,000 |  |  |  |  | $ 0 | $ 195,000 |  |  |
SBLF Program [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Preferred stock, shares issued (in shares) |  |  |  |  |  |  |  |  | 12,000 |
Share price (in dollars per share) |  |  |  |  |  |  |  |  | $ 1,000 |
Common Stock [Member] |  |  |  |  |  |  |  |  |  |
Class of Stock [Line Items] |  |  |  |  |  |  |  |  |  |
Issuance of common stock in public offering (in shares) |  | 2,010,084 |  |  |  |  |  |  |  |
Proceeds from issuance of common stock |  | $ 33,200,000 |  |  |  |  |  |  |  |

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