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Note 5 - Loans and Allowance for Loan Losses - Loan Portfolio by Categories (Details) - USD ($)		Dec. 31, 2017	Dec. 31, 2016
Loans		$ 10,780,000,000	$ 5,630,000,000
Loans acquired, net of discount and allowance	[1]	5,074,076,000	1,305,683,000
Total loans		10,779,685,000	5,632,890,000
Loans, Excluding Acquired Loans [Member]
Loans		5,705,609,000	4,327,207,000
Consumer Portfolio Segment [Member]
Loans		465,516,000	488,563,000
Consumer Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member]
Loans		465,516,000	488,563,000
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Loans		185,422,000	184,591,000
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Loans, Excluding Acquired Loans [Member]
Loans		185,422,000	184,591,000
Consumer Portfolio Segment [Member] | Other Loans [Member]
Loans		280,094,000	303,972,000
Consumer Portfolio Segment [Member] | Other Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans		280,094,000	303,972,000
Commercial Real Estate Portfolio Segment [Member]
Loans		4,239,612,000	3,028,079,000
Commercial Real Estate Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member]
Loans		4,239,612,000	3,028,079,000
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans		614,155,000	336,759,000
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans		614,155,000	336,759,000
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Loans		1,094,633,000	904,245,000
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans		1,094,633,000	904,245,000
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member]
Loans		2,530,824,000	1,787,075,000
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans		2,530,824,000	1,787,075,000
Commercial Portfolio Segment [Member]
Loans		973,519,000	789,903,000
Commercial Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member]
Loans		973,519,000	789,903,000
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Loans		825,217,000	639,525,000
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans		825,217,000	639,525,000
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Loans		148,302,000	150,378,000
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans		148,302,000	150,378,000
Unallocated Financing Receivables [Member]
Loans		26,962,000	20,662,000
Unallocated Financing Receivables [Member] | Loans, Excluding Acquired Loans [Member]
Loans		$ 26,962,000	$ 20,662,000
[1] See Note 6, Loans Acquired, for segregation of loans acquired by loan class.

X

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+ References

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+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 45
-Paragraph 2
-URI http://asc.fasb.org/extlink&oid=82891408&loc=d3e4428-111522

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