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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.

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