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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) | 6 Months Ended
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Jun. 30, 2017 USD ($)
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | $ 124,188,000
Valuation Adjustment | 2,309,000
Fair Value | $ 121,879,000
Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
U S Treasury Rate | 1.72%
Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Spread To U S Treasury Rate | 1.20%
U S Treasury Rate | 2.14%
Minimum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Spread To U S Treasury Rate | 110.00%
Maximum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Spread To U S Treasury Rate | 150.00%
Auction Rate Securities Owned [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | $ 109,225,000
Valuation Adjustment | 2,055,000
Fair Value | 107,170,000
Auction Rate Securities Owned [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 108,900,000
Valuation Adjustment | 2,037,000
Fair Value | $ 106,863,000
Valuation Technique | Discounted Cash Flow
Duration | 4 years
Auction Rate Securities Owned [Member] | Municipal Auction Rate Securities 01 [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | $ 25,000
Valuation Adjustment | 3,000
Fair Value | $ 22,000
Valuation Technique | Secondary Market Trading Activity
Auction Rate Securities Owned [Member] | Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | $ 300,000
Valuation Adjustment | 15,000
Fair Value | $ 285,000
Valuation Technique | Discounted Cash Flow
Discount Rate | 3.34%
Duration | 7 years
Current Yield | 2.51%
Auction Rate Securities Owned [Member] | Minimum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.89%
Current Yield | 1.50%
Auction Rate Securities Owned [Member] | Maximum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 2.58%
Current Yield | 1.93%
Auction Rate Securities Owned [Member] | Maximum [Member] | Municipal Auction Rate Securities 01 [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Fair Value Inputs Observable Trades In Inactive Market For In Portfolio Securities | 87.75%
Auction Rate Securities Owned [Member] | Weighted Average [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 2.17%
Duration | 4 years
Current Yield | 1.68%
Auction Rate Securities Owned [Member] | Weighted Average [Member] | Municipal Auction Rate Securities 01 [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Fair Value Inputs Observable Trades In Inactive Market For In Portfolio Securities | 87.75%
Auction Rate Securities Owned [Member] | Weighted Average [Member] | Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 3.34%
Duration | 7 years
Current Yield | 2.51%
Auction Rate Securities Purchase Commitment [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | $ 14,963,000
Valuation Adjustment | 254,000
Fair Value | 14,709,000
Auction Rate Securities Purchase Commitment [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 14,937,000
Valuation Adjustment | 253,000
Fair Value | $ 14,684,000
Valuation Technique | Discounted Cash Flow
Duration | 4 years
Auction Rate Securities Purchase Commitment [Member] | Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 3.34%
Duration | 7 years
Current Yield | 2.51%
Auction Rate Securities Purchase Commitment [Member] | Minimum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.89%
Current Yield | 1.50%
Auction Rate Securities Purchase Commitment [Member] | Maximum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 2.58%
Current Yield | 1.93%
Auction Rate Securities Purchase Commitment [Member] | Maximum [Member] | Municipal Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Fair Value Inputs Observable Trades In Inactive Market For In Portfolio Securities | 87.75%
Auction Rate Securities Purchase Commitment [Member] | Weighted Average [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 2.17%
Duration | 4 years
Current Yield | 1.68%
Auction Rate Securities Purchase Commitment [Member] | Weighted Average [Member] | Municipal Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Fair Value Inputs Observable Trades In Inactive Market For In Portfolio Securities | 87.75%
Auction Rate Securities Purchase Commitment [Member] | Weighted Average [Member] | Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 3.34%
Duration | 7 years
Current Yield | 2.51%

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