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Acquisition - Narrative (Details) $ in Thousands |  | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Sep. 01, 2019 USD ($) bank_branch shares | Sep. 30, 2019 USD ($) shares | Sep. 30, 2019 USD ($) shares | Sep. 30, 2018 USD ($) | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Less: Common stock issued |  | $ 229,926 | $ 229,926 | $ 0 |
Common Stock |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Stock issued as a part of acquisition (in shares) | shares |  | 6,383,806 | 6,383,806 |  |
Less: Common stock issued |  | $ 798 | $ 798 |  |
MBT |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Percentage of interest acquired | 100.00% |  |  |  |
Number of banking centers acquired | bank_branch | 20 |  |  |  |
Less: Common stock issued | $ 229,900 |  |  |  |
Other intangible assets | 16,527 |  |  |  |
Operating revenue |  | 4,900 | 4,900 |  |
Non-recurring expenses |  | $ 17,300 | $ 18,200 |  | $ 877
MBT | Core deposit intangibles acquired |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Other intangible assets | $ 16,527 |  |  |  |
Acquired intangible asset, expected useful life | 10 years |  |  |  |
MBT | Common Stock |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of shares of common stock | 0.275 |  |  |  |
Stock issued as a part of acquisition (in shares) | shares | 6,400,000 |  |  |  |

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