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Fair Value Measurements - Narrative (Details) - USD ($) | 9 Months Ended |  |
--- | --- | --- | ---
Sep. 30, 2016 | Dec. 31, 2015 | Apr. 12, 2011
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative liability, Fair Value | $ 1,413,000 | $ 14,162,000 |
Derivative Liability, Notional Amount | 5,505,328,000 | 3,268,047,000 |
Principal | 120,479,000 |  |
Securities owned, including amounts pledged of $799,379 ($546,334 in 2015), at fair value | 1,027,933,000 | 734,831,000 |
Auction Rate Securities Committed To Purchase related to settlements with regulators | 3,000,000 |  |
Auction rate securities, firm purchased and hold | 92,000,000 |  |
Amount of ARS committed to purchase from clients | 25,500,000 |  |
Valuation adjustment (unrealized loss) for ARS | $ (1,387,000) |  |
Interest rate | 8.75% |  | 8.75%
Forward or delayed delivery of the underlying instrument with settlement (in days) | 180 days |  |
Fair Value Of Level Three Assets | $ 119,092,000 |  |
Student Loan Auction Rate Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
U S Treasury Rate | 1.42% |  |
Maximum [Member] | Auction Rate Preferred Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
U S Treasury Rate | 1.42% |  |
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% |  |
Minimum [Member] | Auction Rate Preferred Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
U S Treasury Rate | 1.01% |  |
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 | $ 1,000 |  |
Valuation adjustment (unrealized loss) for ARS | 0 |  |
Fair Value Of Level Three Assets | $ 1,000 |  |
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] |  |  |
Principal | $ 21,000 |  |
Valuation adjustment (unrealized loss) for ARS | (1,000) |  |
Fair Value Of Level Three Assets | $ 20,000 |  |
Valuation Technique | Discounted Cash Flow |  |
Mortgage Servicing Rights [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Permanent and construction loans , discount rate | 12.00% |  |
Continuous prepayment rate used up to loans prepayment penalty rate hit 4% | 0.00% |  |
Continuous prepayment rate | 4.00% |  |
Continuous prepayment rate vast majority range minimum | 10.00% |  |
Continuous prepayment rate vast majority range maximum | 15.00% |  |
Continuous prepayment rate vast majority range average rate | 12.00% |  |
Estimated future cost to service loans on an annual basis per loan, average | $ 1,250 |  |
Auction Rate Preferred Securities and Municipal Auction Rate Securities [Member] | Auction Rate Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Valuation adjustment (unrealized loss) for ARS | (276,000) |  |
Auction Rate Securities Purchase Commitment [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Principal | 28,454,000 |  |
Valuation adjustment (unrealized loss) for ARS | 629,000 |  |
Fair Value Of Level Three Assets | 29,083,000 |  |
Auction Rate Securities Purchase Commitment [Member] | Auction Rate Preferred Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Principal | $ 6,512,000 |  |
Duration | 4 years |  |
Valuation adjustment (unrealized loss) for ARS | $ 905,000 |  |
Fair Value Of Level Three Assets | $ 7,417,000 |  |
Valuation Technique | Discounted Cash Flow |  |
Auction Rate Securities Purchase Commitment [Member] | Municipal Auction Rate Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Current Yield | 1.41% |  |
Permanent and construction loans , discount rate | 1.89% |  |
Duration | 4 years 6 months |  |
Auction Rate Securities Purchase Commitment [Member] | Student Loan Auction Rate Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Current Yield | 1.73% |  |
Permanent and construction loans , discount rate | 2.62% |  |
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 | 1.11% |  |
Permanent and construction loans , discount rate | 1.54% |  |
Duration | 4 years |  |
Auction Rate Securities Purchase Commitment [Member] | Weighted Average [Member] | Municipal Auction Rate Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Current Yield | 1.41% |  |
Permanent and construction loans , discount rate | 1.89% |  |
Duration | 4 years 6 months |  |
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 | 1.73% |  |
Permanent and construction loans , discount rate | 2.62% |  |
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 | 1.40% |  |
Permanent and construction loans , discount rate | 1.56% |  |
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 | 0.80% |  |
Permanent and construction loans , discount rate | 1.52% |  |
Auction Rate Securities Owned [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Principal | $ 92,025,000 |  |
Valuation adjustment (unrealized loss) for ARS | (2,016,000) |  |
Fair Value Of Level Three Assets | 90,009,000 |  |
Auction Rate Securities Owned [Member] | Auction Rate Preferred Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Principal | $ 88,100,000 |  |
Duration | 4 years |  |
Valuation adjustment (unrealized loss) for ARS | $ (1,665,000) |  |
Fair Value Of Level Three Assets | $ 86,435,000 |  |
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 | 1.73% |  |
Principal | $ 300,000 |  |
Permanent and construction loans , discount rate | 2.62% |  |
Duration | 7 years |  |
Valuation adjustment (unrealized loss) for ARS | $ (17,000) |  |
Fair Value Of Level Three Assets | $ 283,000 |  |
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 | 1.11% |  |
Permanent and construction loans , discount rate | 1.54% |  |
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 | 1.73% |  |
Permanent and construction loans , discount rate | 2.62% |  |
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 | 1.40% |  |
Permanent and construction loans , discount rate | 1.56% |  |
Auction Rate Securities Owned [Member] | Minimum [Member] | Auction Rate Preferred Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Current Yield | 0.80% |  |
Permanent and construction loans , discount rate | 1.52% |  |
Deferred Compensation, Excluding Share-based Payments and Retirement Benefits [Member] | Equity Securities [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Securities owned, including amounts pledged of $799,379 ($546,334 in 2015), at fair value | $ 14,200,000 | $ 14,000,000 |

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