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Intangible Assets - Summary Of Intangible Assets and Accumulated Amortization Included In The Consolidated Statements of Condition (Details) - USD ($) $ in Thousands | Mar. 31, 2020 | Dec. 31, 2019
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Intangible Assets [Line Items] |  |
Gross Carrying Amount | $ 185,772 | $ 240,637
Accumulated Amortization | (60,880) | (110,437)
Net Carrying Value | 124,892 | 130,200
Core deposit intangibles |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | 157,150 | 157,150
Accumulated Amortization | (51,966) | (47,372)
Net Carrying Value | 105,184 | 109,778
Customer relationships (a) |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | 23,000 | 77,865
Accumulated Amortization | (5,734) | (60,150)
Net Carrying Value | 17,266 | 17,715
Finite-lived intangible assets, fully amortized |  | 54,900
Other |  |
Intangible Assets [Line Items] |  |
Gross Carrying Amount | 5,622 | 5,622
Accumulated Amortization | (3,180) | (2,915)
Net Carrying Value | 2,442 | 2,707
State banking licenses |  |
Intangible Assets [Line Items] |  |
Indefinite-lived intangible assets, excluding goodwill | $ 300 | $ 300

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