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Note 6 - Loans Acquired - Carrying Value of all Acquired Impaired Loans (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Acquired loans	[1]	$ 5,074,076	$ 1,305,683
Acquired loans	[1]	5,074,076	1,305,683
Consumer Portfolio Segment [Member]
Acquired loans		51,467	49,677
Acquired loans		51,467	49,677
Commercial Real Estate Portfolio Segment [Member]
Acquired loans		3,818,037	1,170,871
Acquired loans		3,818,037	1,170,871
Commercial Portfolio Segment [Member]
Acquired loans		1,062,163	85,135
Acquired loans		1,062,163	85,135
Unallocated Financing Receivables [Member]
Acquired loans		142,409
Acquired loans		142,409
Other Loans [Member] | Consumer Portfolio Segment [Member]
Acquired loans		51,467	49,677
Acquired loans		51,467	49,677
Other Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Acquired loans		2,387,777	690,108
Acquired loans		2,387,777	690,108
Construction Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Acquired loans		637,032	57,587
Acquired loans		637,032	57,587
Single Family Residential Loans [Member] | Commercial Real Estate Portfolio Segment [Member]
Acquired loans		793,228	423,176
Acquired loans		793,228	423,176
Commercial Loans [Member] | Commercial Portfolio Segment [Member]
Acquired loans		995,587	81,837
Acquired loans		995,587	81,837
Agricultural Loans [Member] | Commercial Portfolio Segment [Member]
Acquired loans		66,576	3,298
Acquired loans		$ 66,576	$ 3,298
[1] Loans acquired are reported net of a $418,000 and $954,000 allowance as of December 31, 2017 and 2016, respectively.

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

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