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Note 9 - Income Taxes - Reconciliation of Income Tax Expense (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Computed at the statutory rate (35%)	$ 54,223	$ 50,203	$ 37,543
State income taxes, net of federal tax benefit	1,582	2,121	2,097
Discrete items related to ASU 2016-09	(1,480)
Tax exempt interest income	(5,135)	(5,112)	(5,432)
Impact of DTA remeasurement	11,471
Section 382 adjustment			(2,293)
Other differences, net	1,322	(588)	985
Provision for income taxes	$ 61,983	$ 46,624	$ 32,900

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- Definition

Income tax rate reconciliation on the remeasurement of DTA.

+ References

No definition available.

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Adjustment to the effective income tax rate from limitations on operating loss carry-forwards pursuant to section 382 as defined by regulation.

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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 discrete items related to ASU 2016-09.

+ References

No definition available.

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Income tax rate reconciliation on tax exempt interest income.

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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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 235
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.4-08.(h))
-URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690

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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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-Publisher FASB
-Name Accounting Standards Codification
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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 other adjustments.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319

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