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Intangible Assets - Summary Of Intangible Assets and Accumulated Amortization Included In The Consolidated Statements of Condition (Details) $ in Thousands | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2018 branch | Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($)
Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | $ 240,637 | $ 244,137
Accumulated Amortization |  | (85,603) | (59,748)
Net Carrying Value |  | 155,034 | 184,389
Number of branches divested | branch | 2 |  |
Core deposit intangibles |  |  |
Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | 157,150 | 160,650
Accumulated Amortization |  | (28,150) | (8,176)
Net Carrying Value |  | 129,000 | 152,474
Customer Relationships |  |  |
Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | 77,865 | 77,865
Accumulated Amortization |  | (55,597) | (50,777)
Net Carrying Value |  | 22,268 | 27,088
Other |  |  |
Intangible Assets [Line Items] |  |  |
Gross Carrying Amount |  | 5,622 | 5,622
Accumulated Amortization |  | (1,856) | (795)
Net Carrying Value |  | 3,766 | $ 4,827
State banking licenses |  |  |
Intangible Assets [Line Items] |  |  |
Indefinite-lived intangible assets (excluding goodwill) |  | $ 300 |

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