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Note 11 - Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Tax provision at Federal statutory rate, amount |  |  |  |  |  |  |  |  | $ 70,914 | $ 104,407 | $ 84,770
Tax provision at Federal statutory rate, percent |  |  |  |  |  |  |  |  | 21.00% | 35.00% | 35.00%
State income taxes, net of Federal income tax benefit, amount |  |  |  |  |  |  |  |  | $ 29,750 | $ 20,616 | $ 17,250
State income taxes, net of Federal income tax benefit, percent |  |  |  |  |  |  |  |  | 8.80% | 6.90% | 7.10%
Deferred taxes write-down due to Tax Cuts and Jobs Act, amount |  |  |  |  |  |  |  |  |  | $ 23,365 |
Deferred taxes write-down due to Tax Cuts and Jobs Act, percentage |  |  |  |  |  |  |  |  |  | 7.80% |
Excess deduction for stock option and RSUs, amount |  |  |  |  |  |  |  |  | $ (555) | $ (3,146) |
Excess deduction for stock option and RSUs |  |  |  |  |  |  |  |  | (0.20%) | (1.00%) |
Non-taxable bargain purchase gain, amount |  |  |  |  |  |  |  |  | $ (71) | $ (1,970) |
Non-taxable bargain purchase gain |  |  |  |  |  |  |  |  |  | (0.70%) |
Low income housing and other tax credits, amount |  |  |  |  |  |  |  |  | $ (34,517) | $ (20,656) | $ (37,901)
Low income housing and other tax credits |  |  |  |  |  |  |  |  | (10.20%) | (6.90%) | (15.60%)
Non-deductible stock options expense, amount |  |  |  |  |  |  |  |  |  |  | $ 3,469
Non-deductible stock options expense |  |  |  |  |  |  |  |  |  |  | 1.40%
Other, net, amount |  |  |  |  |  |  |  |  | $ 281 | $ (351) | $ (487)
Other, net |  |  |  |  |  |  |  |  | 0.10% | (0.10%) | (0.20%)
Total income tax expense, amount | $ 17,193 | $ 18,698 | $ 11,046 | $ 18,866 | $ 51,166 | $ 35,163 | $ 15,431 | $ 20,505 | $ 65,802 | $ 122,265 | $ 67,101
Total income tax expense |  |  |  |  |  |  |  |  | 19.50% | 41.00% | 27.70%

X
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