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Note 10 - Income Taxes - Effective Income Tax Rate 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
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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Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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