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Note 5 - Investments Schedule of Contractual Maturities (Details) - USD ($) $ in Thousands | Jun. 30, 2018 | Dec. 31, 2017
--- | --- | ---
Schedule of Available-for-sale Securities [Line Items] |  |  |
Federal Home Loan Bank, Advances, General Debt Obligations, Disclosures, Collateral Pledged |  | $ 122,800 |
Available-for-sale Securities, Amortized Cost |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis |  | 3,659,311 | $ 3,426,217
Available-for-sale Securities, Fair Value |  |  |
Available-for-sale Securities, Debt Securities |  | 3,586,055 | 3,458,719
FHLB advances |  | 115,308 | 0
Other than Temporary Impairment, Credit Losses Recognized in Earnings, Credit Losses on Debt Securities Held |  | 0 | 0
Debt Securities |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Available-for-sale Debt Securities, Amortized Cost Basis | [1] | 3,675,725 |
Available-for-sale Securities, Fair Value |  |  |
Available-for-sale Securities, Debt Securities | [1] | 3,602,052 |
Assets Held by Insurance Regulators |  | 15,400 | $ 11,800
Non Asset Backed Security Investments, Contractual Maturities |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Due in one year or less | [2] | 45,836 |
Due after one year through five years | [2] | 789,095 |
Due after five years through ten years | [2] | 1,012,314 |
Due after ten years | [2] | 396,485 |
Available-for-sale Securities, Fair Value |  |  |
Due in one year or less | [2] | 45,694 |
Due after one year through five years | [2] | 774,712 |
Due after five years through ten years | [2] | 973,838 |
Due after ten years | [2] | 393,834 |
RMBS |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis | [3] | 249,577 |
Available-for-sale Securities, Fair Value |  |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value | [3] | 243,659 |
CMBS |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis | [3] | 487,805 |
Available-for-sale Securities, Fair Value |  |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value | [3] | 477,751 |
Other ABS |  |  |
Available-for-sale Securities, Amortized Cost |  |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Amortized Cost Basis | [3] | 694,613 |
Available-for-sale Securities, Fair Value |  |  |
Available-for-sale Securities, Debt Maturities, without Single Maturity Date, Fair Value | [3] | $ 692,564 |
[1] | Includes securities loaned under securities lending agreements.
[2] | Actual maturities may differ as a result of calls before scheduled maturity.
[3] | RMBS, CMBS and Other ABS are shown separately, as they are not due at a single maturity date.

X
- Definition Amount of borrowings as of the balance sheet date from the Federal Home Loan Bank, which are primarily used to cover shortages in the required reserve balance and liquidity shortages. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 470 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6479118&loc=d3e64650-112822 + Details
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- Definition This item represents the cost of debt securities, which are categorized neither as held-to-maturity nor trading, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments recognized, as defined), and fair value hedge accounting adjustments, if any. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (aa) -URI http://asc.fasb.org/extlink&oid=82897076&loc=d3e27161-111563 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.2) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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