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Note 5 - Investments Available for Sale Securities (Details) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Debt Securities, Available-for-sale [Line Items]    
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged $ 114,600 $ 88,400
Loaned securities 22,606 27,860
Securities Financing Transaction, Fair Value    
Debt Securities, Available-for-sale [Line Items]    
Loaned securities [1] 22,606 27,860
Securities Financing Transaction, Fair Value | US government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Loaned securities [1] 0 9,987
Securities Financing Transaction, Fair Value | Corporate bonds and notes    
Debt Securities, Available-for-sale [Line Items]    
Loaned securities [1] 6,526 7,818
Fixed maturities | US government and agency securities    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale Securities, Amortized Cost 94,441 85,532
Available for Sale Securities, Fair Value 94,098 [2] 84,070 [3]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 185 46
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 528 1,508
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 10,900 10,700
Fixed maturities | State and municipal obligations    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale Securities, Amortized Cost 88,598 138,022
Available for Sale Securities, Fair Value 92,718 138,313
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 4,421 2,191
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 301 1,900
Fixed maturities | Corporate bonds and notes    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale Securities, Amortized Cost 2,159,040 2,288,720
Available for Sale Securities, Fair Value 2,175,975 2,229,885
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 31,450 5,053
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 14,515 63,888
Fixed maturities | RMBS    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale Securities, Amortized Cost 348,746 334,843
Available for Sale Securities, Fair Value 350,238 [4] 332,142 [5]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 4,242 1,785
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 2,750 4,486
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged 103,700 77,700
Fixed maturities | CMBS    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale Securities, Amortized Cost 512,190 546,729
Available for Sale Securities, Fair Value 515,604 539,915
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 4,873 544
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 1,459 7,358
Fixed maturities | Other ABS    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale Securities, Amortized Cost 679,444 712,748
Available for Sale Securities, Fair Value 675,477 704,662
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 1,021 814
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 4,988 8,900
Fixed maturities | Total fixed-maturities available for sale    
Debt Securities, Available-for-sale [Line Items]    
Available for Sale Securities, Amortized Cost 3,882,459 4,106,594
Available for Sale Securities, Fair Value 3,904,110 [6] 4,028,987 [7]
Available-for-sale Securities, Accumulated Gross Unrealized Gain, before Tax 46,192 10,433
Available-for-sale Securities, Accumulated Gross Unrealized Loss, before Tax 24,541 88,040
Fixed maturities | Securities Financing Transaction, Fair Value    
Debt Securities, Available-for-sale [Line Items]    
Loaned securities $ 6,500 $ 7,400
[1] Our securities loaned under securities lending agreements are reported at fair value within other assets in our condensed consolidated balance sheets. All of our securities lending agreements are classified as overnight and revolving. None of the amounts are subject to offsetting.
[2] Includes securities with a fair value of $10.9 million serving as collateral for FHLB advances.
[3] Includes securities with a fair value of $10.7 million serving as collateral for FHLB advances.
[4] Includes securities with a fair value of $103.7 million serving as collateral for FHLB advances.
[5] Includes securities with a fair value of $77.7 million serving as collateral for FHLB advances.
[6] Includes $6.5 million of fixed-maturity securities loaned to third-party Borrowers under securities lending agreements, classified as other assets in our condensed consolidated balance sheets, as further described below.
[7] Includes $7.4 million of fixed-maturity securities loaned to third-party Borrowers under securities lending agreements, classified as other assets in our condensed consolidated balance sheets, as further described below.