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Note 5 - Investments Unrealized Gain (Loss) on Investments (Details) - USD ($)
$ in Thousands
Mar. 31, 2017
Dec. 31, 2016
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis $ 2,941,528 $ 2,856,468
Available-for-sale Securities, Debt Securities 2,937,415 2,838,512
Available-for-sale Equity Securities, Amortized Cost Basis 1,330 1,330
Available-for-sale Securities, Equity Securities 1,330 1,330
Amortized Cost Debt and Equity Securities 2,942,858 2,857,798
Available-for-sale Securities 2,938,745 2,839,842
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 25,701 20,827
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 29,814 38,783
US government and agency securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 128,347 78,931
Available-for-sale Securities, Debt Securities 125,466 75,474
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 279 2
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 3,160 3,459
US States and Political Subdivisions Debt Securities [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 67,600 66,124
Available-for-sale Securities, Debt Securities 69,284 67,171
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 2,316 1,868
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 632 821
Corporate bonds and notes    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 1,555,516 1,463,720
Available-for-sale Securities, Debt Securities 1,556,643 1,455,628
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 17,823 14,320
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 16,696 22,412
RMBS    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 278,710 358,262
Available-for-sale Securities, Debt Securities 273,549 350,628
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 445 197
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 5,606 7,831
CMBS    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 402,847 429,057
Available-for-sale Securities, Debt Securities 402,525 428,289
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 2,248 2,255
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 2,570 3,023
Other ABS    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 477,251 433,603
Available-for-sale Securities, Debt Securities 478,099 434,728
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 1,945 2,037
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 1,097 912
Foreign government securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 29,257 24,771
Available-for-sale Securities, Debt Securities 29,849 24,594
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 645 148
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 53 325
Other than Securities Investment [Member]    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 2,000 2,000
Available-for-sale Securities, Debt Securities 2,000 2,000
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 0 0
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 0 0
Debt Securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Debt Securities, Amortized Cost Basis 2,941,528 2,856,468
Available-for-sale Securities, Debt Securities 2,937,415 2,838,512
Available-for-sale Debt Securities, Accumulated Gross Unrealized Gain, before Tax 25,701 20,827
Available-for-sale Debt Securities, Accumulated Gross Unrealized Loss, before Tax 29,814 38,783
Equity securities    
Schedule of Available-for-sale Securities [Line Items]    
Available-for-sale Equity Securities, Amortized Cost Basis 1,330 [1] 1,330 [2]
Available-for-sale Securities, Equity Securities 1,330 [1] 1,330 [2]
Available-for-sale Equity Securities, Accumulated Gross Unrealized Gain, before Tax 0 [1] 0 [2]
Available-for-sale Equity Securities, Accumulated Gross Unrealized Loss, before Tax $ 0 [1] $ 0 [2]
[1] Primarily consists of investments in Federal Home Loan Bank stock as required in connection with the memberships of Radian Guaranty and Radian Reinsurance in the Federal Home Loan Bank of Pittsburgh.
[2] Primarily consists of investments in Federal Home Loan Bank stock as required in connection with the memberships of Radian Guaranty and Radian Reinsurance in the Federal Home Loan Bank of Pittsburgh.