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Note 15 - Additional Cash Flow Information - Company Acquired Assets and Assumed Liabilities Under Purchase Method (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Goodwill	$ 842,651	$ 348,505
Citizens, Liberty Community, First Metropolitan, Delta Trust Acquisitions, and Ozark [Member]
Assets acquired	5,582,495	585,500	$ 2,996,228
Liabilities assumed	5,022,824	530,695	2,680,140
Purchase price	1,055,993	76,300	535,003
Goodwill	$ 496,322	$ 21,495	$ 218,915

X

- Definition

Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer.

+ References

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Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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