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Acquisitions - Narrative (Details) $ in Thousands |  |  | 12 Months Ended
--- | --- | --- | ---
Nov. 09, 2020 USD ($) | Sep. 01, 2019 USD ($) instrument shares | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) shares | Dec. 31, 2018 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Issuance of common stock related to acquisitions |  |  | $ 0 | $ 229,926 | $ 0
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 |
Issuance of common stock related to acquisitions |  |  |  | $ 798 |
Hoosier Trust Company |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
The consideration to be paid to the shareholders in cash | $ 3,225 |  |  |  |
MBT |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Percentage of interest acquired |  | 100.00% |  |  |
Number of banking centers acquired | instrument |  | 20 |  |  |
Other intangible assets |  | $ 16,527 |  |  |
Operating revenue |  |  |  | 19,700 |
Non-recurring expenses |  |  |  | $ 19,700 |
MBT | Core deposit intangible 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 |  |  |
Issuance of common stock related to acquisitions |  | $ 229,900 |  |  |

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