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Note 10 - Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Tax provision at Federal statutory rate, amount |  |  |  |  |  |  |  |  | $ 53,333 | $ 73,368 | $ 70,914
Tax provision at Federal statutory rate, percent |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 21.00%
State income taxes, net of Federal income tax benefit, amount |  |  |  |  |  |  |  |  | $ 23,602 | $ 33,276 | $ 29,750
State income taxes, net of Federal income tax benefit, percent |  |  |  |  |  |  |  |  | 9.30% | 9.50% | 8.80%
Excess deduction for stock option and RSUs, amount |  |  |  |  |  |  |  |  | $ 264 | $ (398) | $ (555)
Excess deduction for stock option and RSUs, percent |  |  |  |  |  |  |  |  | 0.10% | (0.10%) | (0.20%)
Non-taxable bargain purchase gain, amount |  |  |  |  |  |  |  |  | $ 0 | $ 0 | $ (71)
Non-taxable bargain purchase gain, percent |  |  |  |  |  |  |  |  | 0.00% | 0.00% | 0.00%
Low income housing and other tax credits, amount |  |  |  |  |  |  |  |  | $ (52,979) | $ (37,519) | $ (34,517)
Low income housing and other tax credits, percent |  |  |  |  |  |  |  |  | (20.80%) | (10.70%) | (10.20%)
Other, net, amount |  |  |  |  |  |  |  |  | $ 885 | $ 1,507 | $ 281
Other, net, percent |  |  |  |  |  |  |  |  | 0.30% | 0.40% | 0.10%
Total income tax expense | $ 10,332 | $ 2,190 | $ 3,492 | $ 9,091 | $ 16,290 | $ 20,973 | $ 14,383 | $ 18,588 | $ 25,105 | $ 70,234 | $ 65,802
Total income tax expense, percent |  |  |  |  |  |  |  |  | 9.90% | 20.10% | 19.50%

X
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax exempt income, equity in earnings (loss) of an unconsolidated subsidiary, minority noncontrolling interest income (loss), tax holiday, disposition of a business, disposition of an asset, repatriation of foreign earnings, repatriation of foreign earnings jobs creation act of 2004, increase (decrease) in enacted tax rate, prior year income taxes, increase (decrease) in deferred tax asset valuation allowance, and other adjustments. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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