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Note 3 - Securities (Tables) | 3 Months Ended
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Mar. 31, 2015
Investments, Debt and Equity Securities [Abstract] |
Available-for-sale Securities [Table Text Block] |
|  |  |  |  | Gross |  |  | Gross |  |  |  |  |
|  | Amortized |  |  | Unrealized |  |  | Unrealized |  |  | Fair |
|  | Cost |  |  | Gains |  |  | Losses |  |  | Value |
March 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 179,076,000 |  |  | $ | 2,201,000 |  |  | $ | (1,363,000 | ) |  | $ | 179,914,000 |
Mortgage-backed securities |  |  | 86,295,000 |  |  |  | 1,253,000 |  |  |  | (266,000 | ) |  |  | 87,282,000 |
Municipal general obligation bonds |  |  | 133,009,000 |  |  |  | 1,501,000 |  |  |  | (248,000 | ) |  |  | 134,262,000 |
Municipal revenue bonds |  |  | 10,173,000 |  |  |  | 116,000 |  |  |  | (2,000 | ) |  |  | 10,287,000 |
Other investments |  |  | 1,932,000 |  |  |  | 16,000 |  |  |  | 0 |  |  |  | 1,948,000 |
|  | $ | 410,485,000 |  |  | $ | 5,087,000 |  |  | $ | (1,879,000 | ) |  | $ | 413,693,000 |
December 31, 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 |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Loss |  |  | Value |  |  | Loss |  |  | Value |  |  | Loss |
March 31, 2015 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 19,508,000 |  |  | $ | 32,000 |  |  | $ | 69,136,000 |  |  | $ | 1,331,000 |  |  | $ | 88,644,000 |  |  | $ | 1,363,000 |
Mortgage-backed securities |  |  | 26,839,000 |  |  |  | 266,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 26,839,000 |  |  |  | 266,000 |
Municipal general obligation bonds |  |  | 14,427,000 |  |  |  | 248,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 14,427,000 |  |  |  | 248,000 |
Municipal revenue bonds |  |  | 1,885,000 |  |  |  | 2,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 1,885,000 |  |  |  | 2,000 |
Other investments |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
|  | $ | 62,659,000 |  |  | $ | 548,000 |  |  | $ | 69,136,000 |  |  | $ | 1,331,000 |  |  | $ | 131,795,000 |  |  | $ | 1,879,000 |
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |  |  | Fair |  |  | Unrealized |
|  | Value |  |  | Loss |  |  | Value |  |  | Loss |  |  | Value |  |  | Loss |
December 31, 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 |  |  | Amortized |  |  | Fair |
|  | Yield |  |  | Cost |  |  | Value |
Due in 2015 |  |  | 0.71 | % |  | $ | 23,762,000 |  |  | $ | 23,781,000 |
Due in 2016 through 2020 |  |  | 1.44 |  |  |  | 145,330,000 |  |  |  | 145,610,000 |
Due in 2021 through 2025 |  |  | 3.49 |  |  |  | 67,554,000 |  |  |  | 68,163,000 |
Due in 2026 and beyond |  |  | 3.58 |  |  |  | 85,612,000 |  |  |  | 86,909,000 |
Mortgage‑backed securities |  |  | 1.78 |  |  |  | 86,295,000 |  |  |  | 87,282,000 |
Other investments |  |  | 2.50 |  |  |  | 1,932,000 |  |  |  | 1,948,000 |
|  |  | 2.19 | % |  | $ | 410,485,000 |  |  | $ | 413,693,000 |

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