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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($)
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Level Three Principal Amount | $ 48,033,000 | $ 48,033,000
Valuation Adjustment For Level Three Asset and Liability | 4,196,000 | 4,196,000
Fair Value Of Level Three Assets and Liabilities | 43,837,000 | 43,837,000
Auction rate securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Level Three Principal Amount | 40,800,000 | 40,800,000
Valuation Adjustment | 3,117,000 | 3,117,000
Fair Value | 37,683,000 | 37,683,000
Auction Rate Preferred Securities 01 [Member] | Auction rate securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Level Three Principal Amount | 18,950,000 | 18,950,000
Valuation Adjustment | 2,697,000 | 2,697,000
Fair Value | 16,253,000 | $ 16,253,000
Fair Value Measurement, Valuation Techniques |  | Tender Offer (4)
Municipal Auction Rate Securities [Member] | Auction rate securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Level Three Principal Amount | 75,000 | $ 75,000
Valuation Adjustment | 0 | 0
Fair Value | $ 75,000 | $ 75,000
Fair Value Measurement, Valuation Techniques |  | Par
Student Loan Auction Rate Securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Spread To U S Treasury Rate | 1.20% | 1.20%
U S Treasury Rate | 2.97% | 2.97%
Student Loan Auction Rate Securities | Auction rate securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Level Three Principal Amount | $ 275,000 | $ 275,000
Valuation Adjustment | 14,000 | 14,000
Fair Value | $ 261,000 | $ 261,000
Fair Value Measurement, Valuation Techniques |  | Discounted Cash Flow
Fair Value Input, Discount Rate |  | 4.17%
Fair Value Unobservable Inputs Duration |  | 5 years 6 months
Fair Value Unobservable Input Current Yield | 3.09% | 3.09%
Student Loan Auction Rate Securities | Weighted Average [Member] | Auction rate securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Input, Discount Rate |  | 4.17%
Fair Value Unobservable Inputs Duration |  | 5 years 6 months
Fair Value Unobservable Input Current Yield | 3.09% | 3.09%
Auction Rate Preferred Securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
U S Treasury Rate | 2.85% | 2.85%
Auction Rate Preferred Securities | Auction rate securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Level Three Principal Amount | $ 21,500,000 | $ 21,500,000
Valuation Adjustment | 406,000 | 406,000
Fair Value | $ 21,094,000 | $ 21,094,000
Fair Value Measurement, Valuation Techniques |  | Discounted Cash Flow
Fair Value Unobservable Inputs Duration |  | 2 years 6 months
Auction Rate Preferred Securities | Minimum [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Spread To U S Treasury Rate | 110.00% | 110.00%
Auction Rate Preferred Securities | Minimum [Member] | Auction rate securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Input, Discount Rate |  | 3.14%
Fair Value Unobservable Input Current Yield | 2.38% | 2.38%
Auction Rate Preferred Securities | Maximum [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Spread To U S Treasury Rate | 150.00% | 150.00%
Auction Rate Preferred Securities | Maximum [Member] | Auction rate securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Input, Discount Rate |  | 4.28%
Fair Value Unobservable Input Current Yield | 3.46% | 3.46%
Auction Rate Preferred Securities | Weighted Average [Member] | Auction rate securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Input, Discount Rate |  | 4.26%
Fair Value Unobservable Inputs Duration |  | 2 years 6 months
Fair Value Unobservable Input Current Yield | 3.45% | 3.45%
Fair Value, Valuation Scenario One [Member] | Auction rate securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Change In Discount Rate | 25.00% | 25.00%
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of Other than 10 or 20 Percent Adverse Change in Discount Rate | $ 126,000 | $ 126,000
Fair Value, Valuation Scenario Two [Member] | Auction rate securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Sensitivity Analysis Of Fair Value Of Interests Continued To Be Held By Transferor Servicing Assets Or Liabilities Change In Discount Rate | 50.00% | 50.00%
Sensitivity Analysis of Fair Value, Transferor's Interests in Transferred Financial Assets, Impact of Other than 10 or 20 Percent Adverse Change in Discount Rate | $ 251,000 | $ 251,000
Auction Rate Securities Purchase Commitment |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Liability, Transfers, Net | 1,078,000 |
Level Three Principal Amount | 7,233,000 | 7,233,000
Valuation Adjustment For Level Three Liabilities | 1,079,000 | 1,079,000
Fair Value Of Level Three Liabilities | 6,154,000 | 6,154,000
Auction Rate Securities Purchase Commitment | Auction Rate Preferred Securities 01 [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Level Three Principal Amount | 7,184,000 | 7,184,000
Valuation Adjustment For Level Three Liabilities | 1,078,000 | 1,078,000
Fair Value Of Level Three Liabilities | 6,106,000 | $ 6,106,000
Fair Value Measurement, Valuation Techniques |  | Tender Offer (4)
Auction Rate Securities Purchase Commitment | Auction Rate Preferred Securities |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Level Three Principal Amount | 49,000 | $ 49,000
Valuation Adjustment For Level Three Liabilities | 1,000 | 1,000
Fair Value Of Level Three Liabilities | $ 48,000 | $ 48,000
Fair Value Measurement, Valuation Techniques |  | Discounted Cash Flow
Fair Value Unobservable Inputs Duration |  | 2 years 6 months
Auction Rate Securities Purchase Commitment | Auction Rate Preferred Securities | Minimum [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Input, Discount Rate |  | 3.14%
Fair Value Unobservable Input Current Yield | 2.38% | 2.38%
Auction Rate Securities Purchase Commitment | Auction Rate Preferred Securities | Maximum [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Input, Discount Rate |  | 4.28%
Fair Value Unobservable Input Current Yield | 3.46% | 3.46%
Auction Rate Securities Purchase Commitment | Auction Rate Preferred Securities | Weighted Average [Member] |  |
Fair Value Measurement Inputs and Valuation Techniques [Line Items] |  |
Fair Value Input, Discount Rate |  | 4.26%
Fair Value Unobservable Inputs Duration |  | 2 years 6 months
Fair Value Unobservable Input Current Yield | 3.45% | 3.45%

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