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Goodwill and other intangibles (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2018 | Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Goodwill | $ 157,999 | $ 112,739 | $ 157,999 | $ 112,739 | $ 112,739 | $ 72,334
Other Intangible Assets, Net | 15,490 | 7,260 | 15,490 | 7,260 | 6,971 | 0
Goodwill, Acquired During Period |  |  | 45,260 | 40,405 | 40,405 |
Indefinite-lived Intangible Assets Acquired |  |  | 10,251 | 7,549 |  |
Acquired goodwill and intangibles |  |  | 55,511 | 47,954 |  |
Amortization of Intangible Assets | 741 | 289 | 1,732 | 289 |  |
Finite-lived Intangible Assets Acquired | 16,500 |  | 16,500 |  | 6,249 |
Indefinite-lived Intangible Assets Acquired | 1,300 |  | 1,300 |  | 1,300 |
Finite-Lived Intangible Assets, Accumulated Amortization | 2,310 |  | 2,310 |  | 578 |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months | 741 |  | 741 |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two | 2,502 |  | 2,502 |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Three | 2,040 |  | 2,040 |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Four | 1,725 |  | 1,725 |  |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Five | 1,548 |  | 1,548 |  |  |
Intangible Assets, Gross (Excluding Goodwill) | 17,800 |  | 17,800 |  | 7,549 |
Intangible Assets, Net (Including Goodwill) | 173,489 | $ 119,999 | 173,489 | $ 119,999 | 119,710 | $ 72,334
Core Deposits [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | 2,310 |  | 2,310 |  | 578 |
Trade Names [Member] |  |  |  |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |  |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization | $ 0 |  | $ 0 |  | $ 0 |

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