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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.

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