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Note 12 - Borrowings and Financing Activities - Schedule of Debt (Details) - USD ($) $ in Thousands | Mar. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Advances from Federal Home Loan Banks | $ 138,833 | $ 176,483
Senior Notes |  |
Debt Instrument [Line Items] |  |
Senior Notes | 1,406,603 | 1,405,674
Senior Notes | Senior Notes Due 2024 |  |
Debt Instrument [Line Items] |  |
Senior Notes | 445,787 | 445,512
Senior Notes | Senior Notes Due 2025 |  |
Debt Instrument [Line Items] |  |
Senior Notes | 517,065 | 516,634
Senior Notes | Senior Notes Due 2027 |  |
Debt Instrument [Line Items] |  |
Senior Notes | 443,751 | 443,528
FHLB Advances |  |
Debt Instrument [Line Items] |  |
Long-term Debt, Maturities, Repayments of Principal, Remainder of Fiscal Year | 26,850 |
Long-term Debt, Maturities, Repayments of Principal in Next Twelve Months | 61,050 | 67,500
Long-term Debt, Maturities, Repayments of Principal in Year Two | 27,995 | 61,050
Long-term Debt, Maturities, Repayments of Principal in Year Three | 9,954 | 27,995
Long-term Debt, Maturities, Repayments of Principal in Year Four | 9,984 | 9,954
Long-term Debt, Maturities, Repayments of Principal in Year Five | 3,000 | 9,984
Long-term Debt, Maturities, Repayments of Principal after Year Five |  | 0
Advances from Federal Home Loan Banks | $ 138,833 | $ 176,483

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- 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://fasb.org/us-gaap/role/ref/legacyRef -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 Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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