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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.

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