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Goodwill and intangible assets - Activity (Details) - USD ($) $ in Thousands |  |  | 9 Months Ended |
--- | --- | --- | --- | ---
Aug. 15, 2020 | Feb. 14, 2020 | Sep. 30, 2020 | Dec. 31, 2019
Goodwill [Roll Forward] |  |  |  |
Goodwill, beginning balance |  |  | $ 169,051 |
Goodwill, ending balance |  |  | 236,086 |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Core deposit and other intangibles, beginning balance |  |  | 17,589 |
Accumulated Amortization |  |  | (38,599) | $ (34,774)
Core deposit and other intangibles, ending balance |  |  | 23,924 |
Core deposit and other intangibles |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Core deposit and other intangibles, beginning balance |  |  | 17,589 |
Accumulated Amortization |  |  | (3,825) |
Core deposit and other intangibles, ending balance |  |  | 23,924 |
Farmers National |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Addition from acquisition/merger |  | $ 6,390 | 6,390 |
Farmers National | Core deposit and other intangibles |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Finite-lived intangible assets acquired |  |  | 2,490 |
Franklin |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Addition from acquisition/merger | $ 60,645 |  | 60,645 |
Franklin | Core deposit and other intangibles |  |  |  |
Finite-lived Intangible Assets [Roll Forward] |  |  |  |
Finite-lived intangible assets acquired |  |  | $ 7,670 |

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