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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 USD ($) branch | Dec. 31, 2017 USD ($)
Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 240,637 | $ 244,137
Accumulated Amortization | (79,142) | (59,748)
Net Carrying Value | $ 161,495 | 184,389
Number of branches divested | branch | 2 |
State banking licenses |  |
Intangible Assets [Line Items] |  |
Net Carrying Value | $ 300 |
Core deposit intangibles |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | 157,150 | 160,650
Accumulated Amortization | (23,148) | (8,176)
Net Carrying Value | 134,002 | 152,474
Customer relationships |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | 77,865 | 77,865
Accumulated Amortization | (54,404) | (50,777)
Net Carrying Value | 23,461 | 27,088
Other |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | 5,622 | 5,622
Accumulated Amortization | (1,590) | (795)
Net Carrying Value | $ 4,032 | $ 4,827

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