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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2016 USD ($)
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | $ 120,479
Valuation Adjustment | 1,387
Fair Value | $ 119,092
Municipal Auction Rate Securities 01 [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Spread To U S Treasury Rate | 175.00%
U S Treasury Rate | 1.08%
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 | 1.42%
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%
U S Treasury Rate | 1.01%
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%
U S Treasury Rate | 1.42%
Auction Rate Securities Owned [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | $ 92,025
Valuation Adjustment | 2,016
Fair Value | 90,009
Auction Rate Securities Owned [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 88,100
Valuation Adjustment | 1,665
Fair Value | $ 86,435
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
Valuation Adjustment | 1
Fair Value | $ 24
Valuation Technique | Discounted Cash Flow
Discount Rate | 1.89%
Duration | 4 years 6 months
Current Yield | 1.41%
Auction Rate Securities Owned [Member] | Student Loan Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | $ 300
Valuation Adjustment | 17
Fair Value | $ 283
Valuation Technique | Discounted Cash Flow
Discount Rate | 2.62%
Duration | 7 years
Current Yield | 1.73%
Auction Rate Securities Owned [Member] | Other Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | $ 3,600
Valuation Adjustment | 333
Fair Value | $ 3,267
Valuation Technique | Secondary Market Trading Activity
Percent of Par | 90.76%
Auction Rate Securities Owned [Member] | Minimum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.52%
Current Yield | 0.80%
Auction Rate Securities Owned [Member] | Maximum [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.56%
Current Yield | 1.40%
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 | 1.54%
Duration | 4 years
Current Yield | 1.11%
Auction Rate Securities Owned [Member] | Weighted Average [Member] | Municipal Auction Rate Securities 01 [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.89%
Duration | 4 years 6 months
Current Yield | 1.41%
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 | 2.62%
Duration | 7 years
Current Yield | 1.73%
Auction Rate Securities Owned [Member] | Weighted Average [Member] | Other Auction Rate Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Percent of Par | 90.76%
Auction Rate Securities Purchase Commitment [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | $ 28,454
Valuation Adjustment | (629)
Fair Value | 29,083
Auction Rate Securities Purchase Commitment [Member] | Auction Rate Preferred Securities [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | 6,512
Valuation Adjustment | (905)
Fair Value | $ 7,417
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 | 2.62%
Duration | 7 years
Current Yield | 1.73%
Auction Rate Securities Purchase Commitment [Member] | Auction Rate Preferred Securities 01 [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Principal | $ 21,920
Valuation Adjustment | 275
Fair Value | $ 21,645
Valuation Technique | Discounted Cash Flow
Duration | 4 years
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 | 1.52%
Current Yield | 0.80%
Auction Rate Securities Purchase Commitment [Member] | Minimum [Member] | Auction Rate Preferred Securities 01 [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.52%
Current Yield | 0.80%
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 | 1.56%
Current Yield | 1.40%
Auction Rate Securities Purchase Commitment [Member] | Maximum [Member] | Auction Rate Preferred Securities 01 [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.56%
Current Yield | 1.40%
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 | 1.54%
Duration | 4 years
Current Yield | 1.11%
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 | 2.62%
Duration | 7 years
Current Yield | 1.73%
Auction Rate Securities Purchase Commitment [Member] | Weighted Average [Member] | Auction Rate Preferred Securities 01 [Member] |
Fair Value Measurements, Recurring and Nonrecurring, Valuation Techniques [Line Items] |
Discount Rate | 1.54%
Duration | 4 years
Current Yield | 1.11%

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