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Note 9 - Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Computed at the statutory rate (35%)	$ 15,235	$ 11,974	$ 38,313	$ 36,418
State income taxes, net of federal tax benefit	342	21	1,117	1,390
Discrete items related to ASU 2016-09	5		(1,372)
Tax exempt interest income	(955)	(1,072)	(3,160)	(3,120)
Tax exempt earnings on BOLI	(178)	(146)	(616)	(665)
Merger related expenses	187	131	559	131
Federal tax credits	(397)	(890)	(1,190)	(943)
Other differences, net	439	764	1,778	998
Provision for income taxes	$ 14,678	$ 10,782	$ 35,429	$ 34,209

X

- 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 discrete items related to ASU 2016-09.

+ References

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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 merger related expenses

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Income tax rate reconciliation on tax exempt interest income.

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Income tax rate reconciliation on cash value changes in bank owned life insurance.

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
-Paragraph 9
-Subparagraph (a),(b)
-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319

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The amount of income tax expense or benefit for the period computed by applying the domestic federal statutory tax rates to pretax income from continuing operations.

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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 state and local income tax expense (benefit).

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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 credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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