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Note 8 - Reinsurance Reinsurance Transaction Details (Details)
$ in Thousands

1 Months Ended

12 Months Ended

15 Months Ended

24 Months Ended

33 Months Ended

36 Months Ended

Dec. 31, 2017

USD ($)

Oct. 31, 2017

USD ($)

Dec. 31, 2018

USD ($)

group

Dec. 31, 2017

USD ($)

Dec. 31, 2016

USD ($)

Mar. 31, 2013

Dec. 31, 2017

USD ($)

Dec. 31, 2015

Dec. 31, 2017

USD ($)

Ceded Credit Risk [Line Items]

Ceded Premiums Earned

$ 67,195

$ 57,271

$ 77,359

Radian Guaranty | 2016 Single Premium QSR Transaction | Reinsurer Concentration Risk

Ceded Credit Risk [Line Items]

Concentration Risk, Percentage

65.00%

20.00%

35.00%

35.00%

35.00%

Ceded Insurance Commission Percentage

25.00%

RIF Ceded

$ 6,900,000

$ 6,300,000

6,900,000

3,800,000

$ 6,900,000

$ 6,900,000

Radian Guaranty | 2016 Single Premium QSR Transaction | Reinsurer Concentration Risk | Maximum

Ceded Credit Risk [Line Items]

Ceded Premiums Written

195,000

Loss Ratio

55.00%

Radian Guaranty | 2018 Single Premium QSR Transaction

Ceded Credit Risk [Line Items]

Ceded Premiums Written

$ 335,000

Ceded Insurance Commission Percentage

25.00%

Percentage of NIW Able to be Ceded Under QSA

65.00%

Number of GSEs | group

1

Radian Guaranty | 2018 Single Premium QSR Transaction | Maximum

Ceded Credit Risk [Line Items]

Loss Ratio

56.00%

Radian Guaranty | 2018 Single Premium QSR Transaction | Reinsurer Concentration Risk

Ceded Credit Risk [Line Items]

RIF Ceded

$ 1,900,000

Radian Guaranty | QSR Program | Reinsurer Concentration Risk | First Lien Mortgage Insurance Products

Ceded Credit Risk [Line Items]

Ceded Premiums Written

^[1]

13,486

19,356

28,097

Ceded Premiums Earned

^[1]

19,660

28,503

42,515

Ceding Commissions Written

3,890

5,536

8,019

Ceding Commissions Earned

^[2]

11,349

13,122

16,573

Reinsurance Recoverable for Unpaid Claims and Claims Adjustments

771

512

771

1,858

771

771

Radian Guaranty | Single Premium QSR Transaction | Reinsurer Concentration Risk | First Lien Mortgage Insurance Products

Ceded Credit Risk [Line Items]

Ceded Premiums Written

^[1]

74,876

193,517

233,206

Ceded Premiums Earned

^[1]

44,286

27,284

29,808

Ceding Commissions Written

29,745

55,333

66,153

Ceding Commissions Earned

^[2]

22,097

13,774

15,303

Reinsurance Recoverable for Unpaid Claims and Claims Adjustments

2,490

4,574

2,490

2,262

2,490

2,490

First Lien Mortgage Insurance Products | Radian Guaranty | QSR Program | Reinsurer Concentration Risk

Ceded Credit Risk [Line Items]

RIF Ceded

$ 1,200,000

$ 900,000

$ 1,200,000

$ 1,600,000

$ 1,200,000

$ 1,200,000

[1]	Net of profit commission.
[2]	Includes amounts reported in policy acquisition costs and other operating expenses.

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