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Fair Value Measurements - Quantitative Information about Level 3 Fair Value Measurements (Detail) - USD ($) $ in Thousands | 12 Months Ended |
--- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value |  | $ 2,866
Failed Auction Security [Member] | Significant Unobservable Inputs (Level 3) [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Estimated Fair Value | $ 2,508 |
Valuation Technique | Discounted cash flow |
Failed Auction Security [Member] | Significant Unobservable Inputs (Level 3) [Member] | Cumulative Probability of Earning Maximum Rate Until Maturity [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unobservable Input | Cumulative probability of earning the maximum rate until maturity |
Weighted Average Interest Rate | 0.04% |
Failed Auction Security [Member] | Significant Unobservable Inputs (Level 3) [Member] | Cumulative Probability of Principal Return Prior to Maturity [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unobservable Input | Cumulative probability of principal return prior to maturity |
Weighted Average Interest Rate | 93.72% |
Failed Auction Security [Member] | Significant Unobservable Inputs (Level 3) [Member] | Cumulative Probability of Default [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unobservable Input | Cumulative probability of default |
Weighted Average Interest Rate | 6.24% |
Failed Auction Security [Member] | Significant Unobservable Inputs (Level 3) [Member] | Liquidity Risk Premium [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unobservable Input | Liquidity risk premium |
Weighted Average Interest Rate | 5.00% |
Failed Auction Security [Member] | Significant Unobservable Inputs (Level 3) [Member] | Recovery Rate in Default [Member] |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |
Unobservable Input | Recovery rate in default |
Weighted Average Interest Rate | 40.00% |

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