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Mergers and acquisitions - FNB Financial Corp. Narrative (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Feb. 14, 2020 USD ($) branch $ / shares shares | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) | Sep. 30, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Merger related expenses |  | $ 20,730 | $ 295 | $ 25,366 | $ 4,699
FNB Financial Corp. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Assets assumed in acquisition | $ 258,218 |  |  |  |
Loans assumed in acquisition | 182,171 |  |  |  |
Deposits assumed in acquisition | $ 209,535 |  |  |  |
Business acquisition, shares issued (in shares) | shares | 954,797 |  |  |  |
Cash consideration paid | $ 15,001 |  |  |  |
Business acquisition, share price (dollar per share) | $ / shares | $ 36.70 |  |  |  |
Business combination, consideration, value | $ 50,042 |  |  |  |
Preliminary goodwill resulting from merger | $ 6,390 |  |  | 6,390 |
Merger related expenses |  | $ 196 |  | $ 2,293 |
FNB Financial Corp. | Kentucky |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of branches acquired | branch | 4 |  |  |  |

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