Reserves for Claims Narrative (Details) - USD ($)	12 Months Ended
	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