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Note 3 - Loans and Allowance for Loan Losses - Age Analysis of Past Due Loans (Details) - USD ($) | Jun. 30, 2016 | Dec. 31, 2015 | Jun. 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 | $ 1,000 | $ 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 | 1,000 | 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 | 14,000 | 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 | 29,000 | 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 | 243,000 | 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 | 159,000 | 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 | 164,000 | 223,000 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] |  |  |
Past due loans | 609,000 | 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 | 129,000 | 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 | 97,000 | 107,000 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Retail Portfolio Segment [Member] | Originated Loan [Member] |  |  |
Past due loans | 226,000 | 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 | 568,000 | 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 | 1,188,000 | 960,000 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Retail Portfolio Segment [Member] | Acquired Loan [Member] |  |  |
Past due loans | 1,756,000 | 1,355,000 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Originated Loan [Member] |  |  |
Past due loans | 227,000 | 725,000 |
Financing Receivables, 30 to 59 Days Past Due [Member] | Acquired Loan [Member] |  |  |
Past due loans | 2,365,000 | 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 | 197,000 | 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 | 197,000 | 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 | 50,000 | 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 | 0 | 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 | 42,000 | 54,000 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] |  |  |
Past due loans | 92,000 | 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 | 21,000 | 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 | 21,000 | 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 | 43,000 | 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 | 261,000 | 354,000 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Retail Portfolio Segment [Member] | Acquired Loan [Member] |  |  |
Past due loans | 304,000 | 398,000 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Originated Loan [Member] |  |  |
Past due loans | 218,000 | 203,000 |
Financing Receivables, 60 to 89 Days Past Due [Member] | Acquired Loan [Member] |  |  |
Past due loans | 396,000 | 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 | 350,000 | 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 | 398,000 | 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 | 419,000 | 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 | 80,000 | 0 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Commercial Portfolio Segment [Member] | Acquired Loan [Member] |  |  |
Past due loans | 1,247,000 | 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 | 11,000 | 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 | 403,000 | 356,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Retail Portfolio Segment [Member] | Originated Loan [Member] |  |  |
Past due loans | 414,000 | 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 | 11,000 | 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 | 344,000 | 416,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Retail Portfolio Segment [Member] | Acquired Loan [Member] |  |  |
Past due loans | 355,000 | 444,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Originated Loan [Member] |  |  |
Past due loans | 414,000 | 365,000 |
Financing Receivables, Equal to Greater than 90 Days Past Due [Member] | Acquired Loan [Member] |  |  |
Past due loans | 1,602,000 | 2,206,000 |
Commercial Portfolio Segment [Member] | Originated Loan [Member] | Commercial and Industrial [Member] |  |  |
Past due loans | 1,000 | 0 |
Current past due | 653,134,000 | 577,872,000 |
Loans | 653,135,000 | 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 | 30,232,000 | 30,138,000 |
Loans | 30,232,000 | 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 | 197,000 | 441,000 |
Current past due | 338,712,000 | 330,357,000 |
Loans | 338,909,000 | 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 | 603,236,000 | 520,754,000 |
Loans | 603,236,000 | 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 | 39,233,000 | 33,954,000 |
Loans | 39,233,000 | 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 | 198,000 | 441,000 |
Current past due | 1,664,547,000 | 1,493,075,000 |
Loans | 1,664,745,000 | 1,493,516,000 | $ 1,322,388,000
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 | 364,000 | 546,000 |
Current past due | 96,637,000 | 117,885,000 |
Loans | 97,001,000 | 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 | 29,000 | 27,000 |
Current past due | 10,268,000 | 14,955,000 |
Loans | 10,297,000 | 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 | 691,000 | 1,890,000 |
Current past due | 99,198,000 | 113,231,000 |
Loans | 99,889,000 | 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 | 578,000 | 835,000 |
Current past due | 113,116,000 | 122,762,000 |
Loans | 113,694,000 | 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 | 286,000 | 277,000 |
Current past due | 73,843,000 | 80,772,000 |
Loans | 74,129,000 | 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 | 1,948,000 | 3,575,000 |
Current past due | 393,062,000 | 449,605,000 |
Loans | 395,010,000 | 453,180,000 |
Loans past due 90 days or more still accruing interest | 0 | 0 |
Commercial Portfolio Segment [Member] | Commercial and Industrial [Member] |  |  |
Loans | 750,136,000 | 696,303,000 |
Commercial Portfolio Segment [Member] | Vacant Land and Land Development and Residential Construction Loan [Member] |  |  |
Loans | 40,529,000 | 45,120,000 |
Commercial Portfolio Segment [Member] | Real Estate Owner Occupied Loan [Member] |  |  |
Loans | 438,798,000 | 445,919,000 |
Commercial Portfolio Segment [Member] | Real Estate Non Owner Occupied Loan [Member] |  |  |
Loans | 716,930,000 | 644,351,000 |
Commercial Portfolio Segment [Member] | Real Estate Multi Family and Residentia lRental Loan [Member] |  |  |
Loans | 113,362,000 | 115,003,000 |
Commercial Portfolio Segment [Member] |  |  |
Loans | 2,059,755,000 | 1,946,696,000 |
Retail Portfolio Segment [Member] | Originated Loan [Member] | Home Equity and Other [Member] |  |  |
Past due loans | 161,000 | 294,000 |
Current past due | 69,235,000 | 67,522,000 |
Loans | 69,396,000 | 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 | 500,000 | 558,000 |
Current past due | 65,313,000 | 54,697,000 |
Loans | 65,813,000 | 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 | 661,000 | 852,000 |
Current past due | 134,548,000 | 122,219,000 |
Loans | 135,209,000 | 123,071,000 | 107,235,000
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 | 622,000 | 467,000 |
Current past due | 61,049,000 | 72,363,000 |
Loans | 61,671,000 | 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 | 1,793,000 | 1,730,000 |
Current past due | 121,512,000 | 133,400,000 |
Loans | 123,305,000 | 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 | 2,415,000 | 2,197,000 |
Current past due | 182,561,000 | 205,763,000 |
Loans | 184,976,000 | 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 | 131,067,000 | 140,646,000 |
Retail Portfolio Segment [Member] | One to Four Family Mortgages [Member] |  |  |
Loans | 189,118,000 | 190,385,000 |
Retail Portfolio Segment [Member] |  |  |
Loans | 320,185,000 | 331,031,000 |
Originated Loan [Member] |  |  |
Past due loans | 859,000 | 1,293,000 |
Current past due | 1,799,095,000 | 1,615,294,000 |
Loans | 1,799,954,000 | 1,616,587,000 | $ 1,429,623,000
Loans past due 90 days or more still accruing interest | 0 | 0 |
Acquired Loan [Member] |  |  |
Past due loans | 4,363,000 | 5,772,000 |
Current past due | 575,623,000 | 655,368,000 |
Loans | 579,986,000 | 661,140,000 |
Loans past due 90 days or more still accruing interest | 0 | 5,000 |
Loans | $ 2,379,940,000 | $ 2,277,727,000 |

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