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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 | Sep. 30, 2017 | Dec. 31, 2016
--- | --- | ---
Financing Receivables |  | $ 6,303,351 | $ 5,632,890
Loans acquired, net of discount and allowance | [1] | 1,092,039 | 1,305,683
Loans acquired | [1] | 1,092,039 | 1,305,683
Pass [Member] |  |  |
Financing Receivables |  | 6,140,412 | 5,433,036
Loans acquired, net of discount and allowance |  | 1,051,889 | 1,217,886
Loans acquired |  | 1,051,889 | 1,217,886
Special Mention [Member] |  |  |
Financing Receivables |  | 32,333 | 33,865
Loans acquired, net of discount and allowance |  | 9,673 | 22,181
Loans acquired |  | 9,673 | 22,181
Substandard [Member] |  |  |
Financing Receivables |  | 129,662 | 164,251
Loans acquired, net of discount and allowance |  | 29,862 | 64,075
Loans acquired |  | 29,862 | 64,075
Doubtful [Member] |  |  |
Financing Receivables |  | 944 | 1,715
Loans acquired, net of discount and allowance |  | 615 | 1,541
Loans acquired |  | 615 | 1,541
Unlikely to be Collected Financing Receivable [Member] |  |  |
Financing Receivables |  |  | 23
Loans acquired, net of discount and allowance |  |  |
Loans acquired |  |  |
Consumer Portfolio Segment [Member] |  |  |
Financing Receivables |  | 494,262 | 488,563
Consumer Portfolio Segment [Member] | Pass [Member] |  |  |
Financing Receivables |  | 490,041 | 485,575
Consumer Portfolio Segment [Member] | Special Mention [Member] |  |  |
Financing Receivables |  |  | 26
Consumer Portfolio Segment [Member] | Substandard [Member] |  |  |
Financing Receivables |  | 4,221 | 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 |  | 176,316 | 184,591
Consumer Portfolio Segment [Member] | Credit Card Receivable [Member] | Pass [Member] |  |  |
Financing Receivables |  | 176,316 | 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 |  |  | 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 |  | 317,946 | 303,972
Consumer Portfolio Segment [Member] | Other Loans [Member] | Pass [Member] |  |  |
Financing Receivables |  | 313,725 | 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 |  | 4,221 | 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 |  | 3,794,900 | 3,028,079
Commercial Real Estate Portfolio Segment [Member] | Pass [Member] |  |  |
Financing Receivables |  | 3,705,982 | 2,943,890
Commercial Real Estate Portfolio Segment [Member] | Special Mention [Member] |  |  |
Financing Receivables |  | 16,367 | 10,996
Commercial Real Estate Portfolio Segment [Member] | Substandard [Member] |  |  |
Financing Receivables |  | 72,246 | 73,019
Commercial Real Estate Portfolio Segment [Member] | Doubtful [Member] |  |  |
Financing Receivables |  | 305 | 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 |  | 515,274 | 336,759
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Pass [Member] |  |  |
Financing Receivables |  | 507,128 | 330,080
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Special Mention [Member] |  |  |
Financing Receivables |  | 2,085 | 98
Commercial Real Estate Portfolio Segment [Member] | Construction Loans [Member] | Substandard [Member] |  |  |
Financing Receivables |  | 6,045 | 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 |  | 1,048,403 | 904,245
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Pass [Member] |  |  |
Financing Receivables |  | 1,022,886 | 875,603
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Special Mention [Member] |  |  |
Financing Receivables |  | 2,553 | 4,024
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Substandard [Member] |  |  |
Financing Receivables |  | 22,675 | 24,460
Commercial Real Estate Portfolio Segment [Member] | Single Family Residential Loans [Member] | Doubtful [Member] |  |  |
Financing Receivables |  | 289 | 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 |  | 2,231,223 | 1,787,075
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Pass [Member] |  |  |
Financing Receivables |  | 2,175,968 | 1,738,207
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Special Mention [Member] |  |  |
Financing Receivables |  | 11,729 | 6,874
Commercial Real Estate Portfolio Segment [Member] | Other Commercial Loans [Member] | Substandard [Member] |  |  |
Financing Receivables |  | 43,526 | 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 |  | 896,809 | 789,903
Commercial Portfolio Segment [Member] | Pass [Member] |  |  |
Financing Receivables |  | 867,159 | 765,023
Commercial Portfolio Segment [Member] | Special Mention [Member] |  |  |
Financing Receivables |  | 6,293 | 662
Commercial Portfolio Segment [Member] | Substandard [Member] |  |  |
Financing Receivables |  | 23,333 | 24,195
Commercial Portfolio Segment [Member] | Doubtful [Member] |  |  |
Financing Receivables |  | 24 |
Commercial Portfolio Segment [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |
Financing Receivables |  |  | 23
Commercial Portfolio Segment [Member] | Commercial Loans [Member] |  |  |
Financing Receivables |  | 688,960 | 639,525
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Pass [Member] |  |  |
Financing Receivables |  | 661,635 | 616,805
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Special Mention [Member] |  |  |
Financing Receivables |  | 6,267 | 558
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Substandard [Member] |  |  |
Financing Receivables |  | 21,057 | 22,162
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Doubtful [Member] |  |  |
Financing Receivables |  | 1 |
Commercial Portfolio Segment [Member] | Commercial Loans [Member] | Unlikely to be Collected Financing Receivable [Member] |  |  |
Financing Receivables |  |  |
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] |  |  |
Financing Receivables |  | 207,849 | 150,378
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Pass [Member] |  |  |
Financing Receivables |  | 205,524 | 148,218
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Special Mention [Member] |  |  |
Financing Receivables |  | 26 | 104
Commercial Portfolio Segment [Member] | Agricultural Loans [Member] | Substandard [Member] |  |  |
Financing Receivables |  | 2,276 | 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 |  | 25,341 | 20,662
Unallocated Financing Receivables [Member] | Pass [Member] |  |  |
Financing Receivables |  | 25,341 | 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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- 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 + Details
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