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Business Combinations - Additional Information (Details) - USD ($) $ / shares in Units, $ in Millions | Sep. 25, 2020 | Dec. 31, 2020 | Dec. 31, 2019
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Business Acquisition [Line Items] |  |  |
Common stock, par value (in dollars per share) |  | $ 4 | $ 4
LINCO Bancshares, Inc. |  |  |
Business Acquisition [Line Items] |  |  |
Percentage of issued and outstanding shares acquired | 100.00% |  |
Common stock, par value (in dollars per share) | $ 1.00 |  |
Share Price | $ 4.00 |  |
Consideration payable in cash | $ 103.5 |  |
Consideration payable in shares | 1,262,246 |  |
Dividends paid | $ 13.0 |  |

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