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Fair Value Measurements - Reconciliation and Income Statement Classification of Gains and Losses for All Assets and Liabilities (Detail) $ in Thousands | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2015 USD ($) Security | Jun. 30, 2015 USD ($) Security | Sep. 30, 2014 USD ($) | Sep. 30, 2015 USD ($) Security | Sep. 30, 2014 USD ($) | Dec. 31, 2014 USD ($)
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Estimated Fair Value | $ 669,340 |  |  | $ 669,340 |  | $ 1,060,717
Gross realized losses on sales of securities | $ 0 |  | $ 0 | $ (166) | $ (1) |
Equity security [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Number of equity securities | Security | 2 | 1 |  | 2 |  |
Recurring Basis [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Estimated Fair Value | $ 669,340 |  |  | $ 669,340 |  | 1,060,717
Security One [Member] | Equity security [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Book value of equity security |  |  |  |  |  | 200
Estimated Fair Value |  |  |  |  |  | 200
Security Two [Member] | Equity security [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Book value of equity security |  |  |  |  |  | 250
Estimated Fair Value |  |  |  |  |  | 214
Gross realized losses on sales of securities |  | $ (75) |  |  |  |
Fair Value, Inputs, Level 3 [Member] | Recurring Basis [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Estimated Fair Value | 0 |  |  | 0 |  | $ 1,123
Fair Value, Inputs, Level 3 [Member] | Recurring Basis [Member] | Municipal bonds-tax exempt [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Beginning Balance |  |  |  | 709 |  |
Purchases, Issuances and Settlement |  |  |  | (709) |  |
Realized Gains or Losses in Earnings |  |  |  | 0 |  |
Unrealized Gains or Losses in Other Comprehensive Income |  |  |  | 0 |  |
Ending Balance | 0 |  |  | 0 |  |
Fair Value, Inputs, Level 3 [Member] | Recurring Basis [Member] | Equity security [Member] |  |  |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |  |  |
Beginning Balance |  |  |  | 414 |  |
Purchases, Issuances and Settlement |  |  |  | (339) |  |
Realized Gains or Losses in Earnings |  |  |  | (75) |  |
Unrealized Gains or Losses in Other Comprehensive Income |  |  |  | 0 |  |
Ending Balance | $ 0 |  |  | $ 0 |  |

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- Definition This item represents the cost of equity securities, which are categorized neither as held-to-maturity nor trading, net of adjustments for other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References No definition available. + Details
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- Definition Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=51813488&loc=d3e22054-111558 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 5 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=27724398&loc=d3e27232-111563 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49167202&loc=d3e26610-111562 + Details
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- Definition Amount of gain (loss) recognized in the income statement for financial instrument classified as an asset measured using unobservable inputs that reflect the entity's own assumption about the assumptions market participants would use in pricing. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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