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Mergers and acquisitions - Franklin Financial Network, Inc. Narrative (Details) $ / shares in Units, $ in Thousands |  | 3 Months Ended | 9 Months Ended
--- | --- | --- | ---
Aug. 15, 2020 USD ($) branch $ / shares shares | Sep. 30, 2020 USD ($) branch | Sep. 30, 2019 USD ($) | Sep. 30, 2020 USD ($) branch | Sep. 30, 2019 USD ($)
Business Acquisition [Line Items] |  |  |  |  |
Merger costs |  | $ 20,730 | $ 295 | $ 25,366 | $ 4,699
Franklin Financial Network, Inc. |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of branches acquired | branch | 15 |  |  |  |
Assets assumed in acquisition | $ 3,624,830 |  |  |  |
Loans assumed in acquisition | 2,794,569 |  |  |  |
Deposits assumed in acquisition | 3,107,005 |  |  |  |
Non-strategic loans assumed in acquisition | $ 318,365 |  |  |  |
Business acquisition, shares issued (in shares) | shares | 15,058,181 |  |  |  |
Equivalent value of parent stock (n shares) | shares | 44,311 |  |  |  |
Cash consideration paid | $ 31,330 |  |  |  |
Business acquisition, stock assumed, pre combination service, fair value | $ 674 |  |  |  |
Business acquisition, share price (dollar per share) | $ / shares | $ 29.52 |  |  |  |
Business combination, consideration, value | $ 477,830 |  |  |  |
Addition from acquisition/merger | $ 60,645 |  |  | 60,645 |
Merger costs |  | $ 20,489 |  | $ 22,896 |
Franklin Financial Network, Inc. | Tennessee |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Number of branches closed and consolidated | branch |  | 6 |  | 6 |

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