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Note 11 - Income Taxes - Income Tax Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2016 | Sep. 30, 2016 | Jun. 30, 2016 | Mar. 31, 2016 | Dec. 31, 2015 | Sep. 30, 2015 | Jun. 30, 2015 | Mar. 31, 2015 | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Tax provision at Federal statutory rate, amount |  |  |  |  |  |  |  |  | $ 84,770 | $ 77,384 | $ 76,928
Tax provision at Federal statutory rate, percent |  |  |  |  |  |  |  |  | 35.00% | 35.00% | 35.00%
State income taxes, net of Federal income tax benefit, amount |  |  |  |  |  |  |  |  | $ 17,250 | $ 14,656 | $ 14,324
State income taxes, net of Federal income tax benefit, percent |  |  |  |  |  |  |  |  | 7.10% | 6.60% | 6.60%
Low income housing and other tax credits, amount |  |  |  |  |  |  |  |  | $ (37,901) | $ (30,986) | $ (10,014)
Low income housing and other tax credits, percent |  |  |  |  |  |  |  |  | (15.60%) | (14.00%) | (4.60%)
Non-deductible stock options expense, amount |  |  |  |  |  |  |  |  | $ 3,469 |  |
Non-deductible stock options expense, percent |  |  |  |  |  |  |  |  | 1.40% |  |
Other, net, amount |  |  |  |  |  |  |  |  | $ (487) | $ (1,067) | $ 727
Other, net, percent |  |  |  |  |  |  |  |  | (0.20%) | (0.50%) | 0.30%
Total income tax expense | $ 16,345 | $ 15,808 | $ 12,273 | $ 22,675 | $ 16,787 | $ 12,098 | $ 9,738 | $ 21,364 | $ 67,101 | $ 59,987 | $ 81,965
Total income tax expense, percent |  |  |  |  |  |  |  |  | 27.70% | 27.10% | 37.30%

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- Definition Percentage of domestic federal statutory tax rate applicable to pretax income (loss). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32698-109319 + Details
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