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Note 2 - Securities (Tables) | 9 Months Ended
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Sep. 30, 2016
Notes Tables |
Available-for-sale Securities [Table Text Block] |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
September 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 138,133,000 |  |  | $ | 391,000 |  |  | $ | (641,000 | ) |  | $ | 137,883,000 |
Mortgage-backed securities |  |  | 51,671,000 |  |  |  | 956,000 |  |  |  | (58,000 | ) |  |  | 52,569,000 |
Municipal general obligation bonds |  |  | 122,293,000 |  |  |  | 2,357,000 |  |  |  | (164,000 | ) |  |  | 124,486,000 |
Municipal revenue bonds |  |  | 8,458,000 |  |  |  | 70,000 |  |  |  | (10,000 | ) |  |  | 8,518,000 |
Other investments |  |  | 1,970,000 |  |  |  | 17,000 |  |  |  | 0 |  |  |  | 1,987,000 |
|  | $ | 322,525,000 |  |  | $ | 3,791,000 |  |  | $ | (873,000 | ) |  | $ | 325,443,000 |
December 31, 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 |
Available-for-sale Securities, Continuous Unrealized Loss Position, Fair Value [Table Text Block] |
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
September 30, 2016 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 52,728,000 |  |  | $ | 633,000 |  |  | $ | 1,992,000 |  |  | $ | 8,000 |  |  | $ | 54,720,000 |  |  | $ | 641,000 |
Mortgage-backed securities |  |  | 787,000 |  |  |  | 3,000 |  |  |  | 15,064,000 |  |  |  | 55,000 |  |  |  | 15,851,000 |  |  |  | 58,000 |
Municipal general obligation bonds |  |  | 14,524,000 |  |  |  | 86,000 |  |  |  | 6,644,000 |  |  |  | 78,000 |  |  |  | 21,168,000 |  |  |  | 164,000 |
Municipal revenue bonds |  |  | 1,502,000 |  |  |  | 10,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 1,502,000 |  |  |  | 10,000 |
Other investments |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
|  | $ | 69,541,000 |  |  | $ | 732,000 |  |  | $ | 23,700,000 |  |  | $ | 141,000 |  |  | $ | 93,241,000 |  |  | $ | 873,000 |
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
December 31, 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 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Weighted Average Yield |  |  | Amortized Cost |  |  | Fair Value |
Due in 2016 |  |  | 2.07 | % |  | $ | 14,095,000 |  |  | $ | 14,030,000 |
Due in 2017 through 2021 |  |  | 1.83 |  |  |  | 116,939,000 |  |  |  | 117,856,000 |
Due in 2022 through 2026 |  |  | 2.78 |  |  |  | 69,857,000 |  |  |  | 70,885,000 |
Due in 2027 and beyond |  |  | 2.86 |  |  |  | 67,993,000 |  |  |  | 68,116,000 |
Mortgage-backed securities |  |  | 1.77 |  |  |  | 51,671,000 |  |  |  | 52,569,000 |
Other investments |  |  | 4.60 |  |  |  | 1,970,000 |  |  |  | 1,987,000 |
|  |  | 2.27 | % |  | $ | 322,525,000 |  |  | $ | 325,443,000 |

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