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Contingencies - Narrative (Details) - USD ($) |  |  |  |  |  | 6 Months Ended
--- | --- | --- | --- | --- | --- | ---
Jan. 27, 2017 | Jun. 07, 2016 | Feb. 17, 2015 | Feb. 09, 2015 | Jan. 27, 2015 | Jun. 30, 2016
Loss Contingencies [Line Items] |  |  |  |  |  |
Minimum estimated range of aggregate loss for legal proceedings |  |  |  |  |  | $ 0
Maximum estimated range of aggregate loss for legal proceedings |  |  |  |  |  | 54,000,000
Auction rate securities, firm purchased and hold |  |  |  |  |  | 90,700,000
Amount of ARS committed to purchase from clients |  |  |  |  |  | 26,900,000
Eligible investor subject to future buyback potential additional losses related to valuation adjustments |  |  |  |  |  | 34,300,000
Eligible Investor Subject To Future Buyback Potential Additional Losses Related To Valuation Adjustments |  |  |  |  |  | 0
Litigation settlement, expense |  |  |  |  |  | $ 10,000,000
SEC [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Litigation settlement, amount |  |  |  |  | $ 10,000,000 |
Payments for legal settlements |  |  | $ 5,000,000 |  |  |
SEC [Member] | Disgorgement [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Litigation settlement, amount |  |  |  |  | 4,200,000 |
SEC [Member] | Prejudgment Interest [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Litigation settlement, amount |  |  |  |  | 753,500 |
SEC [Member] | Civil Penalties [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Litigation settlement, amount |  |  |  |  | 5,100,000 |
United States Department of the Treasury [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Litigation settlement, amount |  |  |  |  | $ 10,000,000 |
Payments for legal settlements |  |  |  | $ 5,000,000 |  |
FINRA Case [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Litigation settlement, amount |  | $ 2,300,000 |  |  |  |
FINRA Case [Member] | Eligible Clients |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Litigation settlement, amount |  | $ 717,000 |  |  |  |
Forecast [Member] | SEC [Member] |  |  |  |  |  |
Loss Contingencies [Line Items] |  |  |  |  |  |
Payments for legal settlements | $ 5,000,000 |  |  |  |  |

X
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