Reinsurance (Details) - USD ($)			1 Months Ended	3 Months Ended
		Jul. 01, 2015	Jun. 30, 2015	Mar. 31, 2016	Mar. 31, 2015	Dec. 31, 2015	Dec. 31, 2014
Reinsurance Disclosures [Abstract]
Premiums earned - Direct				$ 255,387,000	$ 245,748,000
Premiums earned - Assumed				208,000	338,000
Premiums earned - Ceded				(34,254,000)	(28,798,000)
Net premiums earned				221,341,000	217,288,000
Losses incurred - Direct				92,432,000	88,036,000
Losses incurred - Assumed				101,000	568,000
Losses incurred - Ceded				(7,521,000)	(6,819,000)
Net losses incurred				85,012,000	81,785,000
Premiums Written and Earned [Abstract]
Ceded premiums written, net of profit commission				34,218,000	31,294,000
Premiums earned - Ceded				34,254,000	28,798,000
Losses incurred - Ceded				7,521,000	6,819,000
Reinsurance recoverable on loss reserves				$ 41,119,000	55,415,000	$ 44,487,000	$ 57,841,000
Period of existing captive reinsurance agreement			10 years	10 years
Reinsurance recoverable on loss reserves related to captive agreements				$ 23,000,000		34,000,000
Fair value of trust fund assets under captive agreements				123,000,000		137,000,000
Quota Share Reinsurance Agreement, 2013
Reinsurance Disclosures [Abstract]
Premiums earned - Ceded					(24,613,000)
Losses incurred - Ceded					(4,873,000)
Premiums Written and Earned [Abstract]
Ceded premiums written, net of profit commission					27,136,000
Premiums earned - Ceded					24,613,000
Losses incurred - Ceded					4,873,000
Ceding commissions	[1]				10,122,000
Profit commission					$ 23,474,000
Quota Share Reinsurance Agreement, 2015
Reinsurance Disclosures [Abstract]
Premiums earned - Ceded	[2]			(31,666,000)
Losses incurred - Ceded				(8,513,000)
Effects of Reinsurance [Line Items]
Contingent termination fee		$ 0
Threshold for private mortgage insurer eligibility requirements for termination election		90.00%
Quota share for all policies covered		30.00%
Ceding commission, percentage		20.00%
Loss ratio threshold for profit commissions		60.00%
Premiums Written and Earned [Abstract]
Ceded premiums written, net of profit commission	[2]			31,666,000
Premiums earned - Ceded	[2]			31,666,000
Losses incurred - Ceded				8,513,000
Ceding commissions	[1]			11,576,000
Profit commission				26,215,000
Reinsurance recoverable on loss reserves				$ 18,000,000		$ 11,000,000

[1] Ceding commissions are reported within Other underwriting and operating expenses, net on the consolidated statements of operations.

[2] Effective July 1, 2015 premiums are ceded on an earned and received basis as defined in our 2015 QSR Transaction.