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Fair Value Measurements - Narrative (Details) - USD ($) | 6 Months Ended |
--- | --- | ---
Jun. 30, 2017 | Dec. 31, 2016
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Auction Rate Securities Committed To Purchase related to settlements with regulators | $ 5,000,000 |
Derivative Liability, Fair Value, Amount Not Offset Against Collateral | 4,130,000 | $ 2,024,000
Derivative Liability, Notional Amount | 4,663,277,000 | 4,756,631,000
Principal | 124,188,000 |
Amount Of Auction Rate Securities Firm Purchased And Hold Net of Redemptions | 109,200,000 |
Auction Rate Securities Committed To Purchase From Clients under Legal Settlements and Awards | 10,000,000 |
Securities purchased under agreements to resell, fair value | 3,617,000 | $ 24,006,000
Fair Value Of Securities Repurchase Agreement | 0 |
Valuation adjustment (unrealized loss) for ARS | $ (2,309,000) |
Forward or delayed delivery of the underlying instrument with settlement (in days) | 180 days |
Fair Value Of Level Three Assets | $ 121,879,000 |
Auction Rate Preferred Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
U S Treasury Rate | 1.72% |
Student Loan Auction Rate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
U S Treasury Rate | 2.14% |
Maximum [Member] | LIBOR or Treasury Yield [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Auction market preferred securities variable interest rate earned | 200.00% |
Auction Rate Securities [Member] | Maximum [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Commitment to purchase ARS period maximum | 2020 |
Auction Rate Securities Purchase Commitment [Member] | Municipal Auction Rate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Principal | $ 2,000 |
Valuation adjustment (unrealized loss) for ARS | 0 |
Fair Value Of Level Three Assets | $ 2,000 |
Valuation Technique | Secondary Market Trading Activity |
Auction Rate Securities Purchase Commitment [Member] | Student Loan Auction Rate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Principal | $ 24,000 |
Valuation adjustment (unrealized loss) for ARS | (1,000) |
Fair Value Of Level Three Assets | $ 23,000 |
Valuation Technique | Discounted Cash Flow |
Auction Rate Securities Purchase Commitment [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Principal | $ 14,963,000 |
Valuation adjustment (unrealized loss) for ARS | (254,000) |
Fair Value Of Level Three Assets | 14,709,000 |
Auction Rate Securities Purchase Commitment [Member] | Auction Rate Preferred Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Principal | $ 14,937,000 |
Duration | 4 years |
Valuation adjustment (unrealized loss) for ARS | $ (253,000) |
Fair Value Of Level Three Assets | $ 14,684,000 |
Valuation Technique | Discounted Cash Flow |
Auction Rate Securities Purchase Commitment [Member] | Student Loan Auction Rate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Current Yield | 2.51% |
Permanent and construction loans , discount rate | 3.34% |
Duration | 7 years |
Auction Rate Securities Purchase Commitment [Member] | Weighted Average [Member] | Auction Rate Preferred Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Current Yield | 1.68% |
Permanent and construction loans , discount rate | 2.17% |
Duration | 4 years |
Auction Rate Securities Purchase Commitment [Member] | Weighted Average [Member] | Student Loan Auction Rate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Current Yield | 2.51% |
Permanent and construction loans , discount rate | 3.34% |
Duration | 7 years |
Auction Rate Securities Purchase Commitment [Member] | Maximum [Member] | Auction Rate Preferred Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Current Yield | 1.93% |
Permanent and construction loans , discount rate | 2.58% |
Auction Rate Securities Purchase Commitment [Member] | Minimum [Member] | Auction Rate Preferred Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Current Yield | 1.50% |
Permanent and construction loans , discount rate | 1.89% |
Auction Rate Securities Owned [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Principal | $ 109,225,000 |
Valuation adjustment (unrealized loss) for ARS | (2,055,000) |
Fair Value Of Level Three Assets | 107,170,000 |
Auction Rate Securities Owned [Member] | Auction Rate Preferred Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Principal | $ 108,900,000 |
Duration | 4 years |
Valuation adjustment (unrealized loss) for ARS | $ (2,037,000) |
Fair Value Of Level Three Assets | $ 106,863,000 |
Valuation Technique | Discounted Cash Flow |
Auction Rate Securities Owned [Member] | Student Loan Auction Rate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Current Yield | 2.51% |
Principal | $ 300,000 |
Permanent and construction loans , discount rate | 3.34% |
Duration | 7 years |
Valuation adjustment (unrealized loss) for ARS | $ (15,000) |
Fair Value Of Level Three Assets | $ 285,000 |
Valuation Technique | Discounted Cash Flow |
Auction Rate Securities Owned [Member] | Weighted Average [Member] | Auction Rate Preferred Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Current Yield | 1.68% |
Permanent and construction loans , discount rate | 2.17% |
Duration | 4 years |
Auction Rate Securities Owned [Member] | Weighted Average [Member] | Student Loan Auction Rate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Current Yield | 2.51% |
Permanent and construction loans , discount rate | 3.34% |
Duration | 7 years |
Auction Rate Securities Owned [Member] | Maximum [Member] | Auction Rate Preferred Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Current Yield | 1.93% |
Permanent and construction loans , discount rate | 2.58% |
Auction Rate Securities Owned [Member] | Minimum [Member] | Auction Rate Preferred Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Current Yield | 1.50% |
Permanent and construction loans , discount rate | 1.89% |
Fair Value, Valuation Scenario Two [Member] | Auction Rate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Change in discount rate | 50.00% |
Decrease in fair value of ARS | $ 2,300,000 |
Fair Value, Valuation Scenario One [Member] | Auction Rate Securities [Member] |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |
Change in discount rate | 25.00% |
Decrease in fair value of ARS | $ 1,200,000 |

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