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Note 3 - Loans and Allowance for Loan Losses - Age Analysis of Past Due Loans (Details) - USD ($) | Sep. 30, 2016 | Dec. 31, 2015 | Sep. 30, 2015
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Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member] |  |  |
Past due loans | $ 28,000 | $ 0 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] |  |  |
Past due loans | 0 | 0 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member] |  |  |
Past due loans | 0 | 432,000 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member] |  |  |
Past due loans | 0 | 0 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member] |  |  |
Past due loans | 0 | 0 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] |  |  |
Past due loans | 28,000 | 432,000 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member] |  |  |
Past due loans | 64,000 | 0 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] |  |  |
Past due loans | 0 | 27,000 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Owner Occupied Loan [Member] |  |  |
Past due loans | 125,000 | 323,000 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member] |  |  |
Past due loans | 0 | 53,000 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member] |  |  |
Past due loans | 0 | 223,000 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] |  |  |
Past due loans | 189,000 | 626,000 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member] |  |  |
Past due loans | 38,000 | 186,000 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Retail Portfolio Segment [Member] | Originated Loan [Member] | One to Four Family Mortgages [Member] |  |  |
Past due loans | 252,000 | 107,000 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Retail Portfolio Segment [Member] | Originated Loan [Member] |  |  |
Past due loans | 290,000 | 293,000 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member] |  |  |
Past due loans | 242,000 | 395,000 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Retail Portfolio Segment [Member] | Acquired Loan [Member] | One to Four Family Mortgages [Member] |  |  |
Past due loans | 1,081,000 | 960,000 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Retail Portfolio Segment [Member] | Acquired Loan [Member] |  |  |
Past due loans | 1,323,000 | 1,355,000 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Originated Loan [Member] |  |  |
Past due loans | 318,000 | 725,000 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Acquired Loan [Member] |  |  |
Past due loans | 1,512,000 | 1,981,000 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member] |  |  |
Past due loans | 0 | 0 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] |  |  |
Past due loans | 0 | 0 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member] |  |  |
Past due loans | 0 | 0 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member] |  |  |
Past due loans | 0 | 0 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member] |  |  |
Past due loans | 0 | 0 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] |  |  |
Past due loans | 0 | 0 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member] |  |  |
Past due loans | 0 | 5,000 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] |  |  |
Past due loans | 0 | 0 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Owner Occupied Loan [Member] |  |  |
Past due loans | 0 | 425,000 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member] |  |  |
Past due loans | 507,000 | 703,000 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member] |  |  |
Past due loans | 0 | 54,000 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] |  |  |
Past due loans | 507,000 | 1,187,000 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member] |  |  |
Past due loans | 4,000 | 108,000 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Retail Portfolio Segment [Member] | Originated Loan [Member] | One to Four Family Mortgages [Member] |  |  |
Past due loans | 0 | 95,000 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Retail Portfolio Segment [Member] | Originated Loan [Member] |  |  |
Past due loans | 4,000 | 203,000 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member] |  |  |
Past due loans | 89,000 | 44,000 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Retail Portfolio Segment [Member] | Acquired Loan [Member] | One to Four Family Mortgages [Member] |  |  |
Past due loans | 130,000 | 354,000 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Retail Portfolio Segment [Member] | Acquired Loan [Member] |  |  |
Past due loans | 219,000 | 398,000 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Originated Loan [Member] |  |  |
Past due loans | 4,000 | 203,000 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Acquired Loan [Member] |  |  |
Past due loans | 726,000 | 1,585,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member] |  |  |
Past due loans | 0 | 0 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] |  |  |
Past due loans | 0 | 0 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member] |  |  |
Past due loans | 0 | 9,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member] |  |  |
Past due loans | 0 | 0 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member] |  |  |
Past due loans | 0 | 0 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Originated Loan [Member] |  |  |
Past due loans | 0 | 9,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member] |  |  |
Past due loans | 16,000 | 541,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] |  |  |
Past due loans | 0 | 0 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Owner Occupied Loan [Member] |  |  |
Past due loans | 179,000 | 1,142,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member] |  |  |
Past due loans | 222,000 | 79,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member] |  |  |
Past due loans | 156,000 | 0 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] |  |  |
Past due loans | 573,000 | 1,762,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member] |  |  |
Past due loans | 8,000 | 0 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Retail Portfolio Segment [Member] | Originated Loan [Member] | One to Four Family Mortgages [Member] |  |  |
Past due loans | 262,000 | 356,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Retail Portfolio Segment [Member] | Originated Loan [Member] |  |  |
Past due loans | 270,000 | 356,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member] |  |  |
Past due loans | 40,000 | 28,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Retail Portfolio Segment [Member] | Acquired Loan [Member] | One to Four Family Mortgages [Member] |  |  |
Past due loans | 477,000 | 416,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Retail Portfolio Segment [Member] | Acquired Loan [Member] |  |  |
Past due loans | 517,000 | 444,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Originated Loan [Member] |  |  |
Past due loans | 270,000 | 365,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Acquired Loan [Member] |  |  |
Past due loans | 1,090,000 | 2,206,000 |
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member] |  |  |
Past due loans | 28,000 | 0 |
Current past due | 667,023,000 | 577,872,000 |
Loans | 667,051,000 | 577,872,000 |
Loans past due 90 days or more still accruing interest | 0 | 0 |
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] |  |  |
Past due loans | 0 | 0 |
Current past due | 28,003,000 | 30,138,000 |
Loans | 28,003,000 | 30,138,000 |
Loans past due 90 days or more still accruing interest | 0 | 0 |
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Owner Occupied Loan [Member] |  |  |
Past due loans | 0 | 441,000 |
Current past due | 346,323,000 | 330,357,000 |
Loans | 346,323,000 | 330,798,000 |
Loans past due 90 days or more still accruing interest | 0 | 0 |
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Non Owner Occupied Loan [Member] |  |  |
Past due loans | 0 | 0 |
Current past due | 638,090,000 | 520,754,000 |
Loans | 638,090,000 | 520,754,000 |
Loans past due 90 days or more still accruing interest | 0 | 0 |
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member] |  |  |
Past due loans | 0 | 0 |
Current past due | 46,239,000 | 33,954,000 |
Loans | 46,239,000 | 33,954,000 |
Loans past due 90 days or more still accruing interest | 0 | 0 |
Commercial Portfolio Segment [Member] | Originated Loan [Member] |  |  |
Past due loans | 28,000 | 441,000 |
Current past due | 1,725,678,000 | 1,493,075,000 |
Loans | 1,725,706,000 | 1,493,516,000 | $ 1,402,320,000
Loans past due 90 days or more still accruing interest | 0 | 0 |
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Commercial and Industrial [Member] |  |  |
Past due loans | 80,000 | 546,000 |
Current past due | 83,199,000 | 117,885,000 |
Loans | 83,279,000 | 118,431,000 |
Loans past due 90 days or more still accruing interest | 0 | 0 |
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] |  |  |
Past due loans | 0 | 27,000 |
Current past due | 9,452,000 | 14,955,000 |
Loans | 9,452,000 | 14,982,000 |
Loans past due 90 days or more still accruing interest | 0 | 0 |
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Owner Occupied Loan [Member] |  |  |
Past due loans | 304,000 | 1,890,000 |
Current past due | 94,077,000 | 113,231,000 |
Loans | 94,381,000 | 115,121,000 |
Loans past due 90 days or more still accruing interest | 0 | 0 |
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Non Owner Occupied Loan [Member] |  |  |
Past due loans | 729,000 | 835,000 |
Current past due | 102,625,000 | 122,762,000 |
Loans | 103,354,000 | 123,597,000 |
Loans past due 90 days or more still accruing interest | 0 | 0 |
Commercial Portfolio Segment [Member] | Acquired Loan [Member] | Real Estate Multi Family and Residentia lRental Loan [Member] |  |  |
Past due loans | 156,000 | 277,000 |
Current past due | 71,708,000 | 80,772,000 |
Loans | 71,864,000 | 81,049,000 |
Loans past due 90 days or more still accruing interest | 0 | 0 |
Commercial Portfolio Segment [Member] | Acquired Loan [Member] |  |  |
Past due loans | 1,269,000 | 3,575,000 |
Current past due | 361,061,000 | 449,605,000 |
Loans | 362,330,000 | 453,180,000 |
Loans past due 90 days or more still accruing interest | 0 | 0 |
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] |  |  |
Loans | 750,330,000 | 696,303,000 |
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] |  |  |
Loans | 37,455,000 | 45,120,000 |
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] |  |  |
Loans | 440,704,000 | 445,919,000 |
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] |  |  |
Loans | 741,444,000 | 644,351,000 |
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residentia lRental Loan [Member] |  |  |
Loans | 118,103,000 | 115,003,000 |
Commercial Portfolio Segment [Member] |  |  |
Loans | 2,088,036,000 | 1,946,696,000 |
Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member] |  |  |
Past due loans | 50,000 | 294,000 |
Current past due | 72,630,000 | 67,522,000 |
Loans | 72,680,000 | 67,816,000 |
Loans past due 90 days or more still accruing interest | 0 | 0 |
Retail Portfolio Segment [Member] | Originated Loan [Member] | One to Four Family Mortgages [Member] |  |  |
Past due loans | 514,000 | 558,000 |
Current past due | 74,321,000 | 54,697,000 |
Loans | 74,835,000 | 55,255,000 |
Loans past due 90 days or more still accruing interest | 0 | 0 |
Retail Portfolio Segment [Member] | Originated Loan [Member] |  |  |
Past due loans | 564,000 | 852,000 |
Current past due | 146,951,000 | 122,219,000 |
Loans | 147,515,000 | 123,071,000 | 117,390,000
Loans past due 90 days or more still accruing interest | 0 | 0 |
Retail Portfolio Segment [Member] | Acquired Loan [Member] | Home Equity and Other [Member] |  |  |
Past due loans | 371,000 | 467,000 |
Current past due | 54,575,000 | 72,363,000 |
Loans | 54,946,000 | 72,830,000 |
Loans past due 90 days or more still accruing interest | 0 | 5,000 |
Retail Portfolio Segment [Member] | Acquired Loan [Member] | One to Four Family Mortgages [Member] |  |  |
Past due loans | 1,688,000 | 1,730,000 |
Current past due | 114,192,000 | 133,400,000 |
Loans | 115,880,000 | 135,130,000 |
Loans past due 90 days or more still accruing interest | 0 | 0 |
Retail Portfolio Segment [Member] | Acquired Loan [Member] |  |  |
Past due loans | 2,059,000 | 2,197,000 |
Current past due | 168,767,000 | 205,763,000 |
Loans | 170,826,000 | 207,960,000 |
Loans past due 90 days or more still accruing interest | 0 | 5,000 |
Retail Portfolio Segment [Member] | Home Equity and Other [Member] |  |  |
Loans | 127,626,000 | 140,646,000 |
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] |  |  |
Loans | 190,715,000 | 190,385,000 |
Retail Portfolio Segment [Member] |  |  |
Loans | 318,341,000 | 331,031,000 |
Originated Loan [Member] |  |  |
Past due loans | 592,000 | 1,293,000 |
Current past due | 1,872,629,000 | 1,615,294,000 |
Loans | 1,873,221,000 | 1,616,587,000 | $ 1,519,710,000
Loans past due 90 days or more still accruing interest | 0 | 0 |
Acquired Loan [Member] |  |  |
Past due loans | 3,328,000 | 5,772,000 |
Current past due | 529,828,000 | 655,368,000 |
Loans | 533,156,000 | 661,140,000 |
Loans past due 90 days or more still accruing interest | 0 | 5,000 |
Loans | $ 2,406,377,000 | $ 2,277,727,000 |

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