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Acquisition - Acquisitions Narrative (Details) |  | 12 Months Ended
--- | --- | ---
Sep. 01, 2019 USD ($) bank_branch shares | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) shares
Business Acquisition [Line Items] |  |  |  |
Issuance of common stock related to acquisitions |  | $ 229,926,000 | $ 0 | $ 321,431,000
Common Stock |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Number of shares of common stock | 0.275 |  |  |
Stock issued as a part of acquisition (in shares) | shares |  | 6,383,806 |  | 8,044,446
Issuance of common stock related to acquisitions |  | $ 798,000 |  | $ 1,006,000
MBT |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Percentage of interest acquired | 100.00% |  |  |
Number of banking centers acquired | bank_branch | 20 |  |  |
Other intangible assets | $ 16,527,000 |  |  |
Operating revenue |  | 19,700,000 |  |
Non-recurring expenses |  | $ 19,700,000 | $ 877,000 |
MBT | Core deposit intangible acquired |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Other intangible assets | $ 16,527,000 |  |  |
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 |  |  |
Issuance of common stock related to acquisitions | $ 229,900,000 |  |  |

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