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Note 2 - Securities (Tables) | 6 Months Ended
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Jun. 30, 2019
Notes Tables |
Available-for-sale Securities [Table Text Block] |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
June 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 199,719,000 |  |  | $ | 2,489,000 |  |  | $ | (1,498,000 | ) |  | $ | 200,710,000 |
Mortgage-backed securities |  |  | 45,380,000 |  |  |  | 449,000 |  |  |  | (142,000 | ) |  |  | 45,687,000 |
Municipal general obligation bonds |  |  | 94,896,000 |  |  |  | 2,297,000 |  |  |  | (58,000 | ) |  |  | 97,135,000 |
Municipal revenue bonds |  |  | 3,847,000 |  |  |  | 50,000 |  |  |  | (5,000 | ) |  |  | 3,892,000 |
Other investments |  |  | 500,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 500,000 |
|  | $ | 344,342,000 |  |  | $ | 5,285,000 |  |  | $ | (1,703,000 | ) |  | $ | 347,924,000 |
December 31, 201 8 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 196,109,000 |  |  | $ | 310,000 |  |  | $ | (9,342,000 | ) |  | $ | 187,077,000 |
Mortgage-backed securities |  |  | 44,263,000 |  |  |  | 187,000 |  |  |  | (792,000 | ) |  |  | 43,658,000 |
Municipal general obligation bonds |  |  | 103,235,000 |  |  |  | 427,000 |  |  |  | (1,165,000 | ) |  |  | 102,497,000 |
Municipal revenue bonds |  |  | 3,688,000 |  |  |  | 4,000 |  |  |  | (58,000 | ) |  |  | 3,634,000 |
Other investments |  |  | 500,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 500,000 |
|  | $ | 347,795,000 |  |  | $ | 928,000 |  |  | $ | (11,357,000 | ) |  | $ | 337,366,000 |
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 |
June 30, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 0 |  |  | $ | 0 |  |  | $ | 82,942,000 |  |  | $ | 1,498,000 |  |  | $ | 82,942,000 |  |  | $ | 1,498,000 |
Mortgage-backed securities |  |  | 0 |  |  |  | 0 |  |  |  | 20,419,000 |  |  |  | 142,000 |  |  |  | 20,419,000 |  |  |  | 142,000 |
Municipal general obligation bonds |  |  | 797,000 |  |  |  | 4,000 |  |  |  | 7,614,000 |  |  |  | 54,000 |  |  |  | 8,411,000 |  |  |  | 58,000 |
Municipal revenue bonds |  |  | 0 |  |  |  | 0 |  |  |  | 1,108,000 |  |  |  | 5,000 |  |  |  | 1,108,000 |  |  |  | 5,000 |
Other investments |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
|  | $ | 797,000 |  |  | $ | 4,000 |  |  | $ | 112,083,000 |  |  | $ | 1,699,000 |  |  | $ | 112,880,000 |  |  | $ | 1,703,000 |
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
December 31, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 31,220,000 |  |  | $ | 1,136,000 |  |  | $ | 136,445,000 |  |  | $ | 8,206,000 |  |  | $ | 167,665,000 |  |  | $ | 9,342,000 |
Mortgage-backed securities |  |  | 11,460,000 |  |  |  | 136,000 |  |  |  | 23,762,000 |  |  |  | 656,000 |  |  |  | 35,222,000 |  |  |  | 792,000 |
Municipal general obligation bonds |  |  | 28,923,000 |  |  |  | 299,000 |  |  |  | 43,961,000 |  |  |  | 866,000 |  |  |  | 72,884,000 |  |  |  | 1,165,000 |
Municipal revenue bonds |  |  | 1,188,000 |  |  |  | 11,000 |  |  |  | 1,372,000 |  |  |  | 47,000 |  |  |  | 2,560,000 |  |  |  | 58,000 |
Other investments |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
|  | $ | 72,791,000 |  |  | $ | 1,582,000 |  |  | $ | 205,540,000 |  |  | $ | 9,775,000 |  |  | $ | 278,331,000 |  |  | $ | 11,357,000 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Weighted Average Yield |  |  | Amortized Cost |  |  | Fair Value |
Due in 2019 |  |  | 2.02% |  |  | $ | 6,087,000 |  |  | $ | 6,085,000 |
Due in 2020 through 2024 |  |  | 2.29 |  |  |  | 67,392,000 |  |  |  | 67,859,000 |
Due in 2025 through 2029 |  |  | 2.72 |  |  |  | 115,087,000 |  |  |  | 116,683,000 |
Due in 2030 and beyond |  |  | 3.20 |  |  |  | 109,896,000 |  |  |  | 111,110,000 |
Mortgage-backed securities |  |  | 2.87 |  |  |  | 45,380,000 |  |  |  | 45,687,000 |
Other investments |  |  | 6.00 |  |  |  | 500,000 |  |  |  | 500,000 |
Total available for sale securities |  |  | 2.80% |  |  | $ | 344,342,000 |  |  | $ | 347,924,000 |

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