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Business Description - Additional Information (Details) $ / shares in Units, $ in Thousands |  |  | 9 Months Ended | 55 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Jul. 31, 2017 $ / shares shares | Jul. 27, 2017 $ / shares shares | Sep. 30, 2017 USD ($) shares | Feb. 19, 2016 Acquisition | Dec. 31, 2016 USD ($) | Sep. 30, 2016 USD ($) | Dec. 31, 2015 USD ($)
Description Of Business [Line Items] |  |  |  |  |  |  |
Total assets |  |  | $ 1,642,714 |  | $ 1,395,551 |  |
Gross loans |  |  | 1,196,522 |  | 1,110,446 |  |
Total deposits |  |  | 1,318,292 |  | 1,152,763 |  |
Total stockholders' Equity |  |  | $ 260,331 |  | $ 181,585 | $ 176,433 | $ 163,645
Number of acquisitions | Acquisition |  |  |  | 4 |  |  |
Initial Public Offering |  |  |  |  |  |  |
Description Of Business [Line Items] |  |  |  |  |  |  |
Number of shares issued in offering | shares | 3,750,000 | 3,750,000 | 3,000,000 |  |  |  |
Share price per share | $ / shares | $ 23.00 | $ 23.00 |  |  |  |  |

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