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Fair Value Measurements - Changes in Level 3 Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2016 | Sep. 30, 2015 | Sep. 30, 2016 | Sep. 30, 2015
Investments [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Asset beginning balance | $ 158 | $ 215 | $ 157 | $ 193
Asset, gain (loss) included in earnings | 31 | (33) | 32 | (11)
Asset, purchases |  | 0 |  | 0
Sales and settlements |  | 0 |  | 0
Asset ending balance | 189 | 182 | 189 | 182
Transfers out of level 3 |  |  |  | 0
Interest Rate Lock Commitments [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Asset beginning balance | 13,453 | 5,060 | 9,161 | 7,576
Liability beginning balance |  | 683 | 923 | 1,222
Asset, gain (loss) included in earnings | 53 | 5,748 | 4,345 | 3,232
Liability, gain (loss) included in earnings |  | 496 | 923 | 1,035
Sales and settlements | (13,453) |  | (13,453) |
Asset ending balance | 53 | 10,808 | 53 | 10,808
Liability ending balance | 0 | 187 | 0 | 187
Auction Rate Securities [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Asset beginning balance | 89,101 | 100,384 | 86,802 | 91,422
Asset, gain (loss) included in earnings | (417) | 1,799 | 3,157 | 1,736
Asset, purchases | 2,000 | 5,600 | 13,775 | 16,325
Sales and settlements | (675) | (11,300) | (13,725) | (13,000)
Asset ending balance | 90,009 | 96,483 | 90,009 | 96,483
Auction Rate Securities Purchase Commitment [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Asset beginning balance | 911 |  | 0 |
Liability beginning balance | 142 | 1,034 | 1,369 | 902
Asset, gain (loss) included in earnings | (6) |  | 905 |
Liability, gain (loss) included in earnings | (134) | 557 | 1,093 | 425
Asset ending balance | 905 |  | 905 |
Liability ending balance | 276 | 477 | 276 | 477
Municipal Bonds [Member] |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Asset beginning balance | 25 | 62 | 81 | 164
Asset, gain (loss) included in earnings | 0 | 3 | 6 | (79)
Sales and settlements | 0 | 0 | (62) | (20)
Asset ending balance | $ 25 | $ 65 | $ 25 | $ 65

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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + 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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- Definition Amount of purchases of 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)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of sale of 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)(2) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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- Definition Amount of transfers of financial instrument classified as an asset out of level 3 of the fair value hierarchy. + 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)(3) -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19207-110258 + Details
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