Reinsurance (Details) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2014 Company	Jun. 30, 2013	Jun. 30, 2014 Company	Jun. 30, 2013	Dec. 31, 2013
Reinsurance [Abstract]
Percentage of quota share (in hundredths)			30.00%
Percentage of ceding commission (in hundredths)			20.00%
Percentage quota share in addendum (in hundredths)			40.00%
Profit commission receivable	$ 47,100,000		$ 47,100,000		$ 2,400,000
Number of other mortgage insurers agreeing to similar CFPB settlements	3		3
Period of existing captive reinsurance agreement			10 years
Reinsurance recoverable on loss reserves related to captive agreements	52,000,000		52,000,000		64,000,000
Fair value of trust fund assets under captive agreements	208,000,000		208,000,000		226,000,000
Fair value of trust fund assets under captive agreements, no reinsurance recoverable on loss reserves	20,000,000		20,000,000		23,000,000
Premiums Written and Earned [Abstract]
Ceded premiums written, net of profit commission	28,294,000	11,390,000	54,914,000	17,988,000
Ceded premiums earned, net of profit commission			50,898,000	14,521,000
Ceded losses incurred			14,871,000	17,234,000
Ceding commissions			$ 18,680,000	$ 2,197,000