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Note 4 - Loans and Allowance for Loan Losses - Loans by Credit Risk Rating, Segregated by Class of Loans (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Balance, end of period |  | $ 5,632,890 | $ 4,919,355
Loans acquired | [1] | 1,305,683 | 1,672,901
Pass [Member] |  |  |
Balance, end of period |  | 5,433,036 | 4,745,322
Loans acquired |  | 1,217,886 | 1,590,384
Special Mention [Member] |  |  |
Balance, end of period |  | 33,865 | 20,334
Loans acquired |  | 22,181 | 9,150
Substandard [Member] |  |  |
Balance, end of period |  | 164,251 | 148,719
Loans acquired |  | 64,075 | 69,219
Doubtful [Member] |  |  |
Balance, end of period |  | 1,715 | 4,521
Loans acquired |  | 1,541 | 3,689
Unlikely to be Collected Financing Receivable [Member] |  |  |
Balance, end of period |  | 23 | 459
Loans acquired |  |  | 459
Consumer Portfolio Segment [Member] |  |  |
Balance, end of period |  | 488,563 | 385,668
Consumer Portfolio Segment [Member] | Pass [Member] |  |  |
Balance, end of period |  | 485,575 | 383,878
Consumer Portfolio Segment [Member] | Special Mention [Member] |  |  |
Balance, end of period |  | 26 |
Consumer Portfolio Segment [Member] | Substandard [Member] |  |  |
Balance, end of period |  | 2,962 | 1,741
Consumer Portfolio Segment [Member] | Doubtful [Member] |  |  |
Balance, end of period |  |  | 49
Consumer Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |
Balance, end of period |  |  |
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] |  |  |
Balance, end of period |  | 184,591 | 177,288
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Pass [Member] |  |  |
Balance, end of period |  | 183,943 | 176,809
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Special Mention [Member] |  |  |
Balance, end of period |  |  |
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Substandard [Member] |  |  |
Balance, end of period |  | 648 | 479
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Doubtful [Member] |  |  |
Balance, end of period |  |  |
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |
Balance, end of period |  |  |
Consumer Portfolio Segment [Member] | Other Loans [Member] |  |  |
Balance, end of period |  | 303,972 | 208,380
Consumer Portfolio Segment [Member] | Other Loans [Member] | Pass [Member] |  |  |
Balance, end of period |  | 301,632 | 207,069
Consumer Portfolio Segment [Member] | Other Loans [Member] | Special Mention [Member] |  |  |
Balance, end of period |  | 26 |
Consumer Portfolio Segment [Member] | Other Loans [Member] | Substandard [Member] |  |  |
Balance, end of period |  | 2,314 | 1,262
Consumer Portfolio Segment [Member] | Other Loans [Member] | Doubtful [Member] |  |  |
Balance, end of period |  |  | 49
Consumer Portfolio Segment [Member] | Other Loans [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |
Balance, end of period |  |  |
Commercial Real Estate Portfolio Segment [Member] |  |  |
Balance, end of period |  | 3,028,079 | 2,204,992
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] |  |  |
Balance, end of period |  | 2,943,890 | 2,128,687
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] |  |  |
Balance, end of period |  | 10,996 | 8,424
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] |  |  |
Balance, end of period |  | 73,019 | 67,104
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] |  |  |
Balance, end of period |  | 174 | 777
Commercial Real Estate Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |
Balance, end of period |  |  |
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] |  |  |
Balance, end of period |  | 336,759 | 279,740
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member] |  |  |
Balance, end of period |  | 330,080 | 270,386
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member] |  |  |
Balance, end of period |  | 98 | 319
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member] |  |  |
Balance, end of period |  | 6,565 | 9,019
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Doubtful [Member] |  |  |
Balance, end of period |  | 16 | 16
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |
Balance, end of period |  |  |
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] |  |  |
Balance, end of period |  | 904,245 | 696,180
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Pass [Member] |  |  |
Balance, end of period |  | 875,603 | 679,484
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Special Mention [Member] |  |  |
Balance, end of period |  | 4,024 | 2,701
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Substandard [Member] |  |  |
Balance, end of period |  | 24,460 | 13,824
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Doubtful [Member] |  |  |
Balance, end of period |  | 158 | 171
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |
Balance, end of period |  |  |
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] |  |  |
Balance, end of period |  | 1,787,075 | 1,229,072
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Pass [Member] |  |  |
Balance, end of period |  | 1,738,207 | 1,178,817
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Special Mention [Member] |  |  |
Balance, end of period |  | 6,874 | 5,404
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Substandard [Member] |  |  |
Balance, end of period |  | 41,994 | 44,261
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Doubtful [Member] |  |  |
Balance, end of period |  |  | 590
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |
Balance, end of period |  |  |
Commercial Portfolio Segment [Member] |  |  |
Balance, end of period |  | 789,903 | 648,679
Commercial Portfolio Segment [Member] | Pass [Member] |  |  |
Balance, end of period |  | 765,023 | 635,351
Commercial Portfolio Segment [Member] | Special Mention [Member] |  |  |
Balance, end of period |  | 662 | 2,760
Commercial Portfolio Segment [Member] | Substandard [Member] |  |  |
Balance, end of period |  | 24,195 | 10,562
Commercial Portfolio Segment [Member] | Doubtful [Member] |  |  |
Balance, end of period |  |  | 6
Commercial Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |
Balance, end of period |  | 23 |
Commercial Portfolio Segment [Member] | Commercial Loans [Member] |  |  |
Balance, end of period |  | 639,525 | 500,116
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Pass [Member] |  |  |
Balance, end of period |  | 616,805 | 487,563
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Special Mention [Member] |  |  |
Balance, end of period |  | 558 | 2,760
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Substandard [Member] |  |  |
Balance, end of period |  | 22,162 | 9,787
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Doubtful [Member] |  |  |
Balance, end of period |  |  | 6
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |
Balance, end of period |  |  |
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] |  |  |
Balance, end of period |  | 150,378 | 148,563
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Pass [Member] |  |  |
Balance, end of period |  | 148,218 | 147,788
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Special Mention [Member] |  |  |
Balance, end of period |  | 104 |
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Substandard [Member] |  |  |
Balance, end of period |  | 2,033 | 775
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Doubtful [Member] |  |  |
Balance, end of period |  |  |
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |
Balance, end of period |  | 23 |
Unallocated Financing Receivables [Member] |  |  |
Balance, end of period |  | 20,662 | 7,115
Unallocated Financing Receivables [Member] | Pass [Member] |  |  |
Balance, end of period |  | 20,662 | 7,022
Unallocated Financing Receivables [Member] | Special Mention [Member] |  |  |
Balance, end of period |  |  |
Unallocated Financing Receivables [Member] | Substandard [Member] |  |  |
Balance, end of period |  |  | 93
Unallocated Financing Receivables [Member] | Doubtful [Member] |  |  |
Balance, end of period |  |  |
Unallocated Financing Receivables [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |
Balance, end of period |  |  |
[1] | See Note 5, Loans Acquired, for segregation of loans acquired by loan class.

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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=65884687&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=66008989&loc=d3e5074-111524 + Details
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