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Note 10 - Income Taxes - Effective Income Tax Rate Reconciliation (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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
Taxes at federal statutory rate |  |  |  |  |  |  |  |  | $ 13,752 | $ 23,147 | $ 37,106
Taxes at federal statutory rate, percentage |  |  |  |  |  |  |  |  | 21.00% | 35.00% | 35.00%
State and local income tax, net of Federal income tax benefit |  |  |  |  |  |  |  |  | $ 1,439 | $ 1,410 | $ 4,890
State and local income tax, net of Federal income tax benefit, percentage |  |  |  |  |  |  |  |  | 2.20% | 2.10% | 4.60%
TCJA |  |  |  |  |  |  |  |  |  | $ 3,770 |
TCJA, percentage |  |  |  |  |  |  |  |  |  | 5.70% |
Tax exempt |  |  |  |  |  |  |  |  | $ (1,961) | $ (2,429) | $ (1,750)
Tax exempt, percentage |  |  |  |  |  |  |  |  | (3.00%) | (3.70%) | (1.70%)
Other |  |  |  |  |  |  |  |  | $ (2,835) | $ (885) | $ 857
Other, percentage |  |  |  |  |  |  |  |  | (4.30%) | (1.30%) | 0.90%
Total provision for income taxes | $ 1,046 | $ 1,910 | $ 4,489 | $ 2,950 | $ 7,693 | $ 5,291 | $ 6,775 | $ 5,254 | $ 10,395 | $ 25,013 | $ 41,103
Taxes at effective rate, percentage |  |  |  |  |  |  |  |  | 15.90% | 37.80% | 38.80%

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