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Reserves for Claims Narrative (Details) - USD ($) | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |
Realized claim recoveries | $ 570,000 | $ 1,040,000 | $ 467,000
Provision rate for title insurance claims | 2.40% | 0.20% | 4.00%
Minimum |  |  |
Causes of Increase (Decrease) in Liability for Unpaid Claims and Claims Adjustment Expense [Line Items] |  |  |
Large claim threshold | $ 250,000 |  |

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