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Note 5 - Loans and Allowance for Loan Losses - Loan Portfolio by Categories (Details) - USD ($)		Sep. 30, 2017	Dec. 31, 2016
Loans		$ 6,303,000,000	$ 5,633,000,000
Loans acquired, net of discount and allowance	[1]	1,092,039,000	1,305,683,000
Total loans		6,303,351,000	5,632,890,000
Loans, Excluding Acquired Loans [Member]
Loans		5,211,312,000	4,327,207,000
Consumer Portfolio Segment [Member]
Loans		494,262,000	488,563,000
Consumer Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member]
Loans		494,262,000	488,563,000
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Loans		176,316,000	184,591,000
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Loans, Excluding Acquired Loans [Member]
Loans		176,316,000	184,591,000
Consumer Portfolio Segment [Member] | Other Loans [Member]
Loans		317,946,000	303,972,000
Consumer Portfolio Segment [Member] | Other Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans		317,946,000	303,972,000
Commercial Real Estate Portfolio Segment [Member]
Loans		3,794,900,000	3,028,079,000
Commercial Real Estate Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member]
Loans		3,794,900,000	3,028,079,000
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans		515,274,000	336,759,000
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans		515,274,000	336,759,000
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Loans		1,048,403,000	904,245,000
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans		1,048,403,000	904,245,000
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member]
Loans		2,231,223,000	1,787,075,000
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans		2,231,223,000	1,787,075,000
Commercial Portfolio Segment [Member]
Loans		896,809,000	789,903,000
Commercial Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member]
Loans		896,809,000	789,903,000
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Loans		688,960,000	639,525,000
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans		688,960,000	639,525,000
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Loans		207,849,000	150,378,000
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans		207,849,000	150,378,000
Unallocated Financing Receivables [Member]
Loans		25,341,000	20,662,000
Unallocated Financing Receivables [Member] | Loans, Excluding Acquired Loans [Member]
Loans		$ 25,341,000	$ 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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- Definition

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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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