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Note 5 - Loans and Allowance for Loan Losses - Loans by Credit Risk Rating, Segregated by Class of Loans (Details) - USD ($) $ in Thousands		Dec. 31, 2017	Dec. 31, 2016
Financing Receivables		$ 10,779,685	$ 5,632,890
Loans acquired, net of discount and allowance	[1]	5,074,076	1,305,683
Loans acquired	[1]	5,074,076	1,305,683
Pass [Member]
Financing Receivables		10,302,189	5,433,036
Loans acquired, net of discount and allowance		4,782,384	1,217,886
Loans acquired		4,782,384	1,217,886
Special Mention [Member]
Financing Receivables		301,922	33,865
Loans acquired, net of discount and allowance		198,314	22,181
Loans acquired		198,314	22,181
Substandard [Member]
Financing Receivables		175,064	164,251
Loans acquired, net of discount and allowance		93,378	64,075
Loans acquired		93,378	64,075
Doubtful [Member]
Financing Receivables		376	1,715
Loans acquired, net of discount and allowance			1,541
Loans acquired			1,541
Unlikely to be Collected Financing Receivable [Member]
Financing Receivables		134	23
Loans acquired, net of discount and allowance
Loans acquired
Consumer Portfolio Segment [Member]
Financing Receivables		465,516	488,563
Consumer Portfolio Segment [Member] | Pass [Member]
Financing Receivables		460,080	485,575
Consumer Portfolio Segment [Member] | Special Mention [Member]
Financing Receivables			26
Consumer Portfolio Segment [Member] | Substandard [Member]
Financing Receivables		5,436	2,962
Consumer Portfolio Segment [Member] | Doubtful [Member]
Financing Receivables
Consumer Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivables
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member]
Financing Receivables		185,422	184,591
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Pass [Member]
Financing Receivables		184,920	183,943
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Special Mention [Member]
Financing Receivables
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Substandard [Member]
Financing Receivables		502	648
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Doubtful [Member]
Financing Receivables
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivables
Consumer Portfolio Segment [Member] | Other Loans [Member]
Financing Receivables		280,094	303,972
Consumer Portfolio Segment [Member] | Other Loans [Member] | Pass [Member]
Financing Receivables		275,160	301,632
Consumer Portfolio Segment [Member] | Other Loans [Member] | Special Mention [Member]
Financing Receivables			26
Consumer Portfolio Segment [Member] | Other Loans [Member] | Substandard [Member]
Financing Receivables		4,934	2,314
Consumer Portfolio Segment [Member] | Other Loans [Member] | Doubtful [Member]
Financing Receivables
Consumer Portfolio Segment [Member] | Other Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivables
Commercial Real Estate Portfolio Segment [Member]
Financing Receivables		4,239,612	3,028,079
Commercial Real Estate Portfolio Segment [Member] | Pass [Member]
Financing Receivables		4,150,321	2,943,890
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member]
Financing Receivables		29,330	10,996
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member]
Financing Receivables		59,658	73,019
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member]
Financing Receivables		303	174
Commercial Real Estate Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivables
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member]
Financing Receivables		614,155	336,759
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member]
Financing Receivables		603,126	330,080
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member]
Financing Receivables		5,795	98
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member]
Financing Receivables		5,218	6,565
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Doubtful [Member]
Financing Receivables		16	16
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivables
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member]
Financing Receivables		1,094,633	904,245
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Pass [Member]
Financing Receivables		1,066,902	875,603
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Special Mention [Member]
Financing Receivables		3,954	4,024
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Substandard [Member]
Financing Receivables		23,490	24,460
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Doubtful [Member]
Financing Receivables		287	158
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivables
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member]
Financing Receivables		2,530,824	1,787,075
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Pass [Member]
Financing Receivables		2,480,293	1,738,207
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Special Mention [Member]
Financing Receivables		19,581	6,874
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Substandard [Member]
Financing Receivables		30,950	41,994
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Doubtful [Member]
Financing Receivables
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivables
Commercial Portfolio Segment [Member]
Financing Receivables		973,519	789,903
Commercial Portfolio Segment [Member] | Pass [Member]
Financing Receivables		882,442	765,023
Commercial Portfolio Segment [Member] | Special Mention [Member]
Financing Receivables		74,278	662
Commercial Portfolio Segment [Member] | Substandard [Member]
Financing Receivables		16,592	24,195
Commercial Portfolio Segment [Member] | Doubtful [Member]
Financing Receivables		73
Commercial Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivables		134	23
Commercial Portfolio Segment [Member] | Commercial Loans [Member]
Financing Receivables		825,217	639,525
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Pass [Member]
Financing Receivables		736,377	616,805
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Special Mention [Member]
Financing Receivables		74,254	558
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Substandard [Member]
Financing Receivables		14,402	22,162
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Doubtful [Member]
Financing Receivables		50
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivables		134
Commercial Portfolio Segment [Member] | Agricultural Loans [Member]
Financing Receivables		148,302	150,378
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Pass [Member]
Financing Receivables		146,065	148,218
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Special Mention [Member]
Financing Receivables		24	104
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Substandard [Member]
Financing Receivables		2,190	2,033
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Doubtful [Member]
Financing Receivables		23
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivables			23
Unallocated Financing Receivables [Member]
Financing Receivables		26,962	20,662
Unallocated Financing Receivables [Member] | Pass [Member]
Financing Receivables		26,962	20,662
Unallocated Financing Receivables [Member] | Special Mention [Member]
Financing Receivables
Unallocated Financing Receivables [Member] | Substandard [Member]
Financing Receivables
Unallocated Financing Receivables [Member] | Doubtful [Member]
Financing Receivables
Unallocated Financing Receivables [Member] | Unlikely to be Collected Financing Receivable [Member]
Financing Receivables
[1] See Note 6, Loans Acquired, for segregation of loans acquired by loan class.

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

+ References

No definition available.

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- Definition

Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements.

+ 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

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 310
-SubTopic 10
-Section 50
-Paragraph 4
-URI http://asc.fasb.org/extlink&oid=84173941&loc=d3e5074-111524

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