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Acquisitions and Divestitures - Purchase Price Allocation (Details) - USD ($) $ in Thousands | Apr. 03, 2017 | Sep. 30, 2017 | Dec. 31, 2016 | Sep. 30, 2016 | Dec. 31, 2015
--- | --- | --- | --- | --- | ---
Business Acquisition [Line Items] |  |  |  |  |
Goodwill |  | $ 236,335 | $ 191,371 | $ 191,371 | $ 191,307
Coastal Securities |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and due from banks | $ 7,502 |  |  |  |
Interest-bearing cash | 4,132 |  |  |  |
Trading securities | 139,082 |  |  |  |
Loans held-for-sale | 236,088 |  |  |  |
Investment securities | 1,413 |  |  |  |
Other intangible assets, net | 27,300 |  |  |  |
Premises and equipment, net | 1,229 |  |  |  |
Other assets | 1,672 |  |  |  |
Total assets acquired | 418,418 |  |  |  |
Securities sold under agreements to repurchase | 201,595 |  |  |  |
Other short-term borrowings | 33,509 |  |  |  |
Fixed income payables | 96,489 |  |  |  |
Other liabilities | 316 |  |  |  |
Total liabilities assumed | 331,909 |  |  |  |
Net Assets Acquired | 86,509 |  |  |  |
Cash | (131,473) |  |  |  |
Goodwill | 44,964 |  |  |  |
As Acquired | Coastal Securities |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |
Cash and due from banks | 7,502 |  |  |  |
Interest-bearing cash | 4,132 |  |  |  |
Trading securities | 423,662 |  |  |  |
Loans held-for-sale | 0 |  |  |  |
Investment securities | 0 |  |  |  |
Other intangible assets, net | 0 |  |  |  |
Premises and equipment, net | 1,229 |  |  |  |
Other assets | 1,658 |  |  |  |
Total assets acquired | 438,183 |  |  |  |
Securities sold under agreements to repurchase | 201,595 |  |  |  |
Other short-term borrowings | 33,509 |  |  |  |
Fixed income payables | 143,647 |  |  |  |
Other liabilities | 958 |  |  |  |
Total liabilities assumed | 379,709 |  |  |  |
Net Assets Acquired | 58,474 |  |  |  |
Adjustment | Coastal Securities |  |  |  |  |
Fair Value Adjustments |  |  |  |  |
Cash and due from banks | 0 |  |  |  |
Interest-bearing cash | 0 |  |  |  |
Trading securities | (284,580) |  |  |  |
Loans held-for-sale | 236,088 |  |  |  |
Investment securities | 1,413 |  |  |  |
Other intangible assets, net | 27,300 |  |  |  |
Premises and equipment, net | 0 |  |  |  |
Other assets | 14 |  |  |  |
Total assets acquired | (19,765) |  |  |  |
Securities sold under agreements to repurchase | 0 |  |  |  |
Other short-term borrowings | 0 |  |  |  |
Fixed income payables | (47,158) |  |  |  |
Other liabilities | (642) |  |  |  |
Total liabilities assumed | (47,800) |  |  |  |
Net Assets Acquired | $ 28,035 |  |  |  |

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