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Note 6 - Loans Acquired - Age Analysis of Past Due Acquired Loans, Excluding Loans Covered by Loss Share (Details) - USD ($) | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Loans | $ 10,780,000,000 | $ 5,630,000,000
Acquired Loans [Member] |  |
Past Due | 47,684,000 | 37,940,000
Current | 5,026,392,000 | 1,267,743,000
Loans | 5,074,076,000 | 1,305,683,000
90 Days Past Due & Accruing | 3,145,000 | 11,000
Acquired Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] |  |
Past Due | 35,988,000 | 12,668,000
Acquired Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Past Due | 11,696,000 | 25,272,000
Consumer Portfolio Segment [Member] |  |
Loans | 465,516,000 | 488,563,000
Consumer Portfolio Segment [Member] | Other Loans [Member] |  |
Loans | 280,094,000 | 303,972,000
Consumer Portfolio Segment [Member] | Acquired Loans [Member] |  |
Past Due | 1,149,000 | 760,000
Current | 50,318,000 | 48,917,000
Loans | 51,467,000 | 49,677,000
90 Days Past Due & Accruing | 108,000 |
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] |  |
Past Due | 889,000 | 571,000
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Past Due | 260,000 | 189,000
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] |  |
Past Due | 1,149,000 | 760,000
Current | 50,318,000 | 48,917,000
Loans | 51,467,000 | 49,677,000
90 Days Past Due & Accruing | 108,000 |
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] |  |
Past Due | 889,000 | 571,000
Consumer Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Past Due | 260,000 | 189,000
Commercial Real Estate Portfolio Segment [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] | Single Family Residential Loans [Member] |  |
Loans | 1,094,633,000 | 904,245,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] |  |
Past Due | 43,086,000 | 34,256,000
Current | 3,774,951,000 | 1,136,615,000
Loans | 3,818,037,000 | 1,170,871,000
90 Days Past Due & Accruing | 2,970,000 | 11,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] |  |
Past Due | 32,689,000 | 11,326,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Past Due | 10,397,000 | 22,930,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] |  |
Past Due | 22,823,000 | 13,577,000
Current | 2,364,954,000 | 676,531,000
Loans | 2,387,777,000 | 690,108,000
90 Days Past Due & Accruing | 2,565,000 |
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] |  |
Past Due | 17,176,000 | 2,836,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Other Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Past Due | 5,647,000 | 10,741,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Construction Loans [Member] |  |
Past Due | 4,025,000 | 7,464,000
Current | 633,007,000 | 50,123,000
Loans | 637,032,000 | 57,587,000
90 Days Past Due & Accruing | 279,000 |
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Construction Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] |  |
Past Due | 2,577,000 | 132,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Construction Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Past Due | 1,448,000 | 7,332,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Single Family Residential Loans [Member] |  |
Past Due | 16,238,000 | 13,215,000
Current | 776,990,000 | 409,961,000
Loans | 793,228,000 | 423,176,000
90 Days Past Due & Accruing | 126,000 | 11,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Single Family Residential Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] |  |
Past Due | 12,936,000 | 8,358,000
Commercial Real Estate Portfolio Segment [Member] | Acquired Loans [Member] | Single Family Residential Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Past Due | 3,302,000 | 4,857,000
Commercial Portfolio Segment [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] | Agricultural Loans [Member] |  |
Loans | 148,302,000 | 150,378,000
Commercial Portfolio Segment [Member] | Acquired Loans [Member] |  |
Past Due | 3,434,000 | 2,924,000
Current | 1,058,729,000 | 82,211,000
Loans | 1,062,163,000 | 85,135,000
90 Days Past Due & Accruing | 67,000 |
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] |  |
Past Due | 2,395,000 | 771,000
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Past Due | 1,039,000 | 2,153,000
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Commercial Loans [Member] |  |
Past Due | 3,383,000 | 2,876,000
Current | 992,204,000 | 78,961,000
Loans | 995,587,000 | 81,837,000
90 Days Past Due & Accruing | 67,000 |
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Commercial Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] |  |
Past Due | 2,344,000 | 723,000
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Commercial Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Past Due | 1,039,000 | 2,153,000
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Agricultural Loans [Member] |  |
Past Due | 51,000 | 48,000
Current | 66,525,000 | 3,250,000
Loans | 66,576,000 | 3,298,000
90 Days Past Due & Accruing |  |
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Agricultural Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] |  |
Past Due | 51,000 | 48,000
Commercial Portfolio Segment [Member] | Acquired Loans [Member] | Agricultural Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Past Due |  |
Unallocated Financing Receivables [Member] |  |
Loans | 26,962,000 | $ 20,662,000
Unallocated Financing Receivables [Member] | Acquired Loans [Member] |  |
Past Due | 15,000 |
Current | 142,394,000 |
Loans | 142,409,000 |
90 Days Past Due & Accruing |  |
Unallocated Financing Receivables [Member] | Acquired Loans [Member] | Financing Receivables, 30 to 89 Days Past Due [Member] |  |
Past Due | 15,000 |
Unallocated Financing Receivables [Member] | Acquired Loans [Member] | Financing Receivables, Equal to Greater than 90 Days Past Due [Member] |  |
Past Due |  |

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