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Note 3 - Securities (Tables) | 12 Months Ended
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Dec. 31, 2015
Investments, Debt and Equity Securities [Abstract] |
Available-for-sale Securities [Table Text Block] |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 146,660,000 |  |  | $ | 1,932,000 |  |  | $ | (1,552,000 | ) |  | $ | 147,040,000 |
Mortgage-backed securities |  |  | 66,670,000 |  |  |  | 708,000 |  |  |  | (304,000 | ) |  |  | 67,074,000 |
Municipal general obligation bonds |  |  | 120,679,000 |  |  |  | 1,549,000 |  |  |  | (205,000 | ) |  |  | 122,023,000 |
Municipal revenue bonds |  |  | 8,841,000 |  |  |  | 76,000 |  |  |  | (3,000 | ) |  |  | 8,914,000 |
Other investments |  |  | 1,946,000 |  |  |  | 0 |  |  |  | (5,000 | ) |  |  | 1,941,000 |
|  | $ | 344,796,000 |  |  | $ | 4,265,000 |  |  | $ | (2,069,000 | ) |  | $ | 346,992,000 |
2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 194,894,000 |  |  | $ | 1,612,000 |  |  | $ | (3,038,000 | ) |  | $ | 193,468,000 |
Mortgage-backed securities |  |  | 92,656,000 |  |  |  | 1,123,000 |  |  |  | (218,000 | ) |  |  | 93,561,000 |
Municipal general obligation bonds |  |  | 132,347,000 |  |  |  | 1,042,000 |  |  |  | (307,000 | ) |  |  | 133,082,000 |
Municipal revenue bonds |  |  | 10,769,000 |  |  |  | 117,000 |  |  |  | (13,000 | ) |  |  | 10,873,000 |
Other investments |  |  | 1,925,000 |  |  |  | 3,000 |  |  |  | 0 |  |  |  | 1,928,000 |
|  | $ | 432,591,000 |  |  | $ | 3,897,000 |  |  | $ | (3,576,000 | ) |  | $ | 432,912,000 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] |
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
Description of Securities |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 0 |  |  | $ | 0 |  |  | $ | 76,496,000 |  |  | $ | 1,552,000 |  |  | $ | 76,496,000 |  |  | $ | 1,552,000 |
Mortgage-backed securities |  |  | 18,025,000 |  |  |  | 69,000 |  |  |  | 34,660,000 |  |  |  | 235,000 |  |  |  | 52,685,000 |  |  |  | 304,000 |
Municipal general obligation bonds |  |  | 1,981,000 |  |  |  | 4,000 |  |  |  | 30,134,000 |  |  |  | 201,000 |  |  |  | 32,115,000 |  |  |  | 205,000 |
Municipal revenue bonds |  |  | 0 |  |  |  | 0 |  |  |  | 1,134,000 |  |  |  | 3,000 |  |  |  | 1,134,000 |  |  |  | 3,000 |
Other investments |  |  | 1,446,000 |  |  |  | 5,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 1,446,000 |  |  |  | 5,000 |
|  | $ | 21,452,000 |  |  | $ | 78,000 |  |  | $ | 142,424,000 |  |  | $ | 1,991,000 |  |  | $ | 163,876,000 |  |  | $ | 2,069,000 |
2014 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 81,891,000 |  |  | $ | 202,000 |  |  | $ | 74,120,000 |  |  | $ | 2,836,000 |  |  | $ | 156,011,000 |  |  | $ | 3,038,000 |
Mortgage-backed securities |  |  | 49,940,000 |  |  |  | 218,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 49,940,000 |  |  |  | 218,000 |
Municipal general obligation bonds |  |  | 54,104,000 |  |  |  | 307,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 54,104,000 |  |  |  | 307,000 |
Municipal revenue bonds |  |  | 4,644,000 |  |  |  | 13,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 4,644,000 |  |  |  | 13,000 |
Other investments |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
|  | $ | 190,579,000 |  |  | $ | 740,000 |  |  | $ | 74,120,000 |  |  | $ | 2,836,000 |  |  | $ | 264,699,000 |  |  | $ | 3,576,000 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Weighted Average Yield |  |  | Amortized Cost |  |  | Fair Value |
Due in one year or less |  |  | 0.89% |  |  | $ | 40,382,000 |  |  | $ | 40,399,000 |
Due from one to five years |  |  | 1.67 |  |  |  | 110,364,000 |  |  |  | 110,552,000 |
Due from five to ten years |  |  | 3.09 |  |  |  | 54,022,000 |  |  |  | 54,868,000 |
Due after ten years |  |  | 3.55 |  |  |  | 71,412,000 |  |  |  | 72,158,000 |
Mortgage-backed securities |  |  | 1.75 |  |  |  | 66,670,000 |  |  |  | 67,074,000 |
Other investments |  |  | 2.51 |  |  |  | 1,946,000 |  |  |  | 1,941,000 |
|  |  | 2.22% |  |  | $ | 344,796,000 |  |  | $ | 346,992,000 |

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