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Note 5 - Loans Acquired - Carrying Value of all Acquired Impaired Loans (Details) - USD ($) $ in Thousands		Dec. 31, 2016	Dec. 31, 2015
Acquired loans	[1]	$ 1,305,683	$ 1,672,901
Consumer Portfolio Segment [Member]
Acquired loans		49,677	75,606
Commercial Real Estate Portfolio Segment [Member]
Acquired loans		1,170,871	1,432,189
Commercial Portfolio Segment [Member]
Acquired loans		85,135	165,106
Credit Card Receivable [Member] | Consumer Portfolio Segment [Member]
Acquired loans
Other Loans [Member] | Consumer Portfolio Segment [Member]
Acquired loans		49,677	75,606
Other Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Acquired loans		690,108	854,068
Construction Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Acquired loans		57,587	77,119
Single Family Residential Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Acquired loans		423,176	501,002
Commercial Loans [Member] | Commercial Portfolio Segment [Member]
Acquired loans		81,837	154,533
Agricultural Loans [Member] | Commercial Portfolio Segment [Member]
Acquired loans		$ 3,298	$ 10,573
[1] Loans acquired are reported net of a $954,000 allowance at December 31, 2016 and 2015.

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Carrying value of acquired impaired loans as of the reported date.

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