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Note 4 - Loans and Allowance for Loan Losses - Loan Portfolio by Categories (Details) - USD ($)		Dec. 31, 2016	Dec. 31, 2015
Loans and Leases Receivable, Gross		$ 5,630,000,000	$ 4,920,000,000
Loans acquired, net of discount and allowance (1)	[1]	1,305,683,000	1,672,901,000
Total loans		5,632,890,000	4,919,355,000
Loans, Excluding Acquired Loans [Member]
Loans and Leases Receivable, Gross		4,327,207,000	3,246,454,000
Consumer Portfolio Segment [Member]
Loans and Leases Receivable, Gross		488,563,000	385,668,000
Consumer Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member]
Loans and Leases Receivable, Gross		488,563,000	385,668,000
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Loans and Leases Receivable, Gross		184,591,000	177,288,000
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Loans, Excluding Acquired Loans [Member]
Loans and Leases Receivable, Gross		184,591,000	177,288,000
Consumer Portfolio Segment [Member] | Other Loans [Member]
Loans and Leases Receivable, Gross		303,972,000	208,380,000
Consumer Portfolio Segment [Member] | Other Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans and Leases Receivable, Gross		303,972,000	208,380,000
Commercial Real Estate Portfolio Segment [Member]
Loans and Leases Receivable, Gross		3,028,079,000	2,204,992,000
Commercial Real Estate Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member]
Loans and Leases Receivable, Gross		3,028,079,000	2,204,992,000
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Loans and Leases Receivable, Gross		336,759,000	279,740,000
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans and Leases Receivable, Gross		336,759,000	279,740,000
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Loans and Leases Receivable, Gross		904,245,000	696,180,000
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans and Leases Receivable, Gross		904,245,000	696,180,000
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member]
Loans and Leases Receivable, Gross		1,787,075,000	1,229,072,000
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans and Leases Receivable, Gross		1,787,075,000	1,229,072,000
Commercial Portfolio Segment [Member]
Loans and Leases Receivable, Gross		789,903,000	648,679,000
Commercial Portfolio Segment [Member] | Loans, Excluding Acquired Loans [Member]
Loans and Leases Receivable, Gross		789,903,000	648,679,000
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Loans and Leases Receivable, Gross		639,525,000	500,116,000
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans and Leases Receivable, Gross		639,525,000	500,116,000
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Loans and Leases Receivable, Gross		150,378,000	148,563,000
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Loans, Excluding Acquired Loans [Member]
Loans and Leases Receivable, Gross		150,378,000	148,563,000
Unallocated Financing Receivables [Member]
Loans and Leases Receivable, Gross		20,662,000	7,115,000
Unallocated Financing Receivables [Member] | Loans, Excluding Acquired Loans [Member]
Loans and Leases Receivable, Gross		$ 20,662,000	$ 7,115,000
[1] See Note 5, Loans Acquired, for segregation of loans acquired by loan class.

X

- Definition

Loans acquired which are not covered by FDIC loss share agreements, net of discount.

+ References

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- Definition

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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=65884687&loc=d3e4428-111522

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