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Other Intangibles - Schedule of Core Deposit and Other Intangibles (Details) - USD ($) $ in Thousands | 9 Months Ended | 12 Months Ended |
--- | --- | --- | ---
Sep. 30, 2019 | Dec. 31, 2017 | Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items] |  |  |
Gross carrying amount | $ 85,869 |  | $ 85,869
Accumulated amortization | (65,844) |  | (61,440)
Total other intangibles | 36,552 |  | $ 24,429
Core deposit intangibles acquired |  |  |
Finite-Lived Intangible Assets [Line Items] |  |  |
Core deposit intangibles acquired | $ 16,527 | $ 0 |

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