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Note 15 - Accumulated Other Comprehensive Income (Loss) - Rollforward of AOCI (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 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 | $ (23,394) | $ 30,839 | (106,286) | $ 143,602
Net realized gains (losses) on disposals and non-credit related impairment losses | 3,238 | 10,884 | 4,490 | 24,172
Net decrease (increase) in expected credit losses | 0 | 147 | 725 | (2,051)
Other comprehensive income (loss), net of tax | (26,632) | 19,808 | (111,501) | 121,481
AOCI, Net of Tax, Balance at end of period | 152,224 |  | 152,224 |
Other Comprehensive Income |  |  |  |
Other Comprehensive Income, before Tax [Abstract] |  |  |  |
AOCI before Tax, Balance at beginning of period | 226,400 | 268,558 | 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 | (29,613) | 39,037 | (134,539) | 181,775
Net realized gains (losses) on disposals and non-credit related impairment losses | 4,099 | 13,777 | 5,684 | 30,597
Net decrease (increase) in expected credit losses | 0 | 186 | 918 | (2,596)
Other comprehensive income (loss) | (33,712) | 25,074 | (141,141) | 153,774
AOCI before Tax, Balance at end of period | 192,688 | 293,632 | 192,688 | 293,632
Other Comprehensive Income, Tax [Abstract] |  |  |  |
AOCI, Tax, Balance at beginning of period | 47,544 | 56,397 | 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 | (6,219) | 8,198 | (28,253) | 38,173
Net realized gains (losses) on disposals and non-credit related impairment losses | 861 | 2,893 | 1,194 | 6,425
Net decrease (increase) in expected credit losses | 0 | 39 | 193 | (545)
Other comprehensive income (loss) | (7,080) | 5,266 | (29,640) | 32,293
AOCI Tax, Balance at end of period | 40,464 | 61,663 | 40,464 | 61,663
Other Comprehensive Income, Net of Tax [Abstract] |  |  |  |
AOCI, Net of Tax, Balance at beginning of period | 178,856 | 212,161 | 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 | (23,394) | 30,839 | (106,286) | 143,602
Net realized gains (losses) on disposals and non-credit related impairment losses | 3,238 | 10,884 | 4,490 | 24,172
Net decrease (increase) in expected credit losses | 0 | 147 | 725 | (2,051)
Other comprehensive income (loss), net of tax | (26,632) | 19,808 | (111,501) | 121,481
AOCI, Net of Tax, Balance at end of period | $ 152,224 | $ 231,969 | $ 152,224 | $ 231,969

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