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Note 15 - Accumulated Other Comprehensive Income (Loss) - Rollforward of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Jun. 30, 2021 | Jun. 30, 2020
Other Comprehensive Income, Net of Tax [Abstract] |  |  |  |
AOCI, Net of Tax, Balance at beginning of period |  |  | $ 263,725 |
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected credit losses has not been recognized | $ 64,477 | $ 185,056 | (82,892) | $ 112,763
Net realized gains (losses) on disposals and non-credit related impairment losses | 1,876 | 4,894 | 1,252 | 13,288
Net decrease (increase) in expected credit losses | 480 | (2,198) | 725 | (2,198)
Other comprehensive income (loss), net of tax | 62,121 | 182,360 | (84,869) | 101,673
AOCI, Net of Tax, Balance at end of period | 178,856 |  | 178,856 |
Other Comprehensive Income |  |  |  |
Other Comprehensive Income, before Tax [Abstract] |  |  |  |
AOCI before Tax, Balance at beginning of period | 147,766 | 37,722 | 333,829 | 139,858
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected credit losses has not been recognized | 81,617 | 234,249 | (104,926) | 142,738
Net realized gains (losses) on disposals and non-credit related impairment losses | 2,375 | 6,195 | 1,585 | 16,820
Net decrease (increase) in expected credit losses | 608 | (2,782) | 918 | (2,782)
Other comprehensive income (loss) | 78,634 | 230,836 | (107,429) | 128,700
AOCI before Tax, Balance at end of period | 226,400 | 268,558 | 226,400 | 268,558
Other Comprehensive Income, Tax [Abstract] |  |  |  |
AOCI, Tax, Balance at beginning of period | 31,031 | 7,921 | 70,104 | 29,370
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected credit losses has not been recognized | 17,140 | 49,193 | (22,034) | 29,975
Net realized gains (losses) on disposals and non-credit related impairment losses | 499 | 1,301 | 333 | 3,532
Net decrease (increase) in expected credit losses | 128 | (584) | 193 | (584)
Other comprehensive income (loss) | 16,513 | 48,476 | (22,560) | 27,027
AOCI Tax, Balance at end of period | 47,544 | 56,397 | 47,544 | 56,397
Other Comprehensive Income, Net of Tax [Abstract] |  |  |  |
AOCI, Net of Tax, Balance at beginning of period | 116,735 | 29,801 | 263,725 | 110,488
Unrealized holding gains (losses) on investments arising during the period for which an allowance for expected credit losses has not been recognized | 64,477 | 185,056 | (82,892) | 112,763
Net realized gains (losses) on disposals and non-credit related impairment losses | 1,876 | 4,894 | 1,252 | 13,288
Net decrease (increase) in expected credit losses | 480 | (2,198) | 725 | (2,198)
Other comprehensive income (loss), net of tax | 62,121 | 182,360 | (84,869) | 101,673
AOCI, Net of Tax, Balance at end of period | $ 178,856 | $ 212,161 | $ 178,856 | $ 212,161

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- Definition Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(30)(a)(4)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e637-108580 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(23)(a)(3)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14A -URI http://asc.fasb.org/extlink&oid=121641772&loc=SL7669686-108580 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 40 -Section 65 -Paragraph 2 -Subparagraph (g)(2)(ii) -URI http://asc.fasb.org/extlink&oid=121370832&loc=SL117420844-207641 Reference 7: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 220 -SubTopic 10 -Section 45 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121641772&loc=d3e681-108580 + Details
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