Litigation and Contingencies (Details) $ in Thousands	6 Months Ended	12 Months Ended
	Jun. 30, 2009	Dec. 31, 2015 USD ($) lawsuit	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)
Curtailments [Abstract]
Average paid claim reduction due to curtailments (in hundredths)		6.70%	6.70%
Number of days after claim paid within which objection must be received for review		90 days
Claims resolved by rescissions [Abstract]
Percentage of claims received in a quarter resolved by rescission, lower range limit (in hundredths)		5.00%
Percentage of claims received in a quarter resolved by rescission, upper range limit (in hundredths)	28.00%
Statute of limitations to bring legal proceedings disputing right to rescind coverage		3 years
Statute of limitations to bring legal proceedings after notice of rescission		2 years
Maximum exposure to loss		$ 317,000
Period of existing captive reinsurance agreement		10 years	10 years	10 years
Civil penalty				$ 2,650
Underwriting remedy expense		$ 1,000	$ 4,000	$ 5,000
Class Action Complaint Under RESPA | Pending Litigation
Claims resolved by rescissions [Abstract]
Number of lawsuits | lawsuit		12