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Note 2 - Securities (Tables) | 6 Months Ended
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Jun. 30, 2020
Notes Tables |
Available-for-sale Securities [Table Text Block] |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
June 30, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 161,575,000 |  |  | $ | 957,000 |  |  | $ | (35,000 | ) |  | $ | 162,497,000 |
Mortgage-backed securities |  |  | 34,765,000 |  |  |  | 1,269,000 |  |  |  | (1,000 | ) |  |  | 36,033,000 |
Municipal general obligation bonds |  |  | 97,171,000 |  |  |  | 5,296,000 |  |  |  | 0 |  |  |  | 102,467,000 |
Municipal revenue bonds |  |  | 5,947,000 |  |  |  | 217,000 |  |  |  | 0 |  |  |  | 6,164,000 |
Other investments |  |  | 500,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 500,000 |
|  | $ | 299,958,000 |  |  | $ | 7,739,000 |  |  | $ | (36,000 | ) |  | $ | 307,661,000 |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 185,103,000 |  |  | $ | 2,449,000 |  |  | $ | (1,142,000 | ) |  | $ | 186,410,000 |
Mortgage-backed securities |  |  | 41,998,000 |  |  |  | 554,000 |  |  |  | (82,000 | ) |  |  | 42,470,000 |
Municipal general obligation bonds |  |  | 98,245,000 |  |  |  | 2,864,000 |  |  |  | (30,000 | ) |  |  | 101,079,000 |
Municipal revenue bonds |  |  | 4,133,000 |  |  |  | 63,000 |  |  |  | 0 |  |  |  | 4,196,000 |
Other investments |  |  | 500,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 500,000 |
|  | $ | 329,979,000 |  |  | $ | 5,930,000 |  |  | $ | (1,254,000 | ) |  | $ | 334,655,000 |
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, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 16,370,000 |  |  | $ | 35,000 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 16,370,000 |  |  | $ | 35,000 |
Mortgage-backed securities |  |  | 0 |  |  |  | 0 |  |  |  | 26,000 |  |  |  | 1,000 |  |  |  | 26,000 |  |  |  | 1,000 |
Municipal general obligation bonds |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Municipal revenue bonds |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
|  | $ | 16,370,000 |  |  | $ | 35,000 |  |  | $ | 26,000 |  |  | $ | 1,000 |  |  | $ | 16,396,000 |  |  | $ | 36,000 |
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
December 31, 2019 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 25,650,000 |  |  | $ | 349,000 |  |  | $ | 73,913,000 |  |  | $ | 793,000 |  |  | $ | 99,563,000 |  |  | $ | 1,142,000 |
Mortgage-backed securities |  |  | 2,838,000 |  |  |  | 28,000 |  |  |  | 10,423,000 |  |  |  | 54,000 |  |  |  | 13,261,000 |  |  |  | 82,000 |
Municipal general obligation bonds |  |  | 3,755,000 |  |  |  | 18,000 |  |  |  | 994,000 |  |  |  | 12,000 |  |  |  | 4,749,000 |  |  |  | 30,000 |
Municipal revenue bonds |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
|  | $ | 32,243,000 |  |  | $ | 395,000 |  |  | $ | 85,330,000 |  |  | $ | 859,000 |  |  | $ | 117,573,000 |  |  | $ | 1,254,000 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Weighted Average Yield |  |  | Amortized Cost |  |  | Fair Value |
Due in 2020 |  | 4.11% |  |  | $ | 410,000 |  |  | $ | 412,000 |
Due in 2021 through 2025 |  | 1.97 |  |  |  | 60,097,000 |  |  |  | 61,369,000 |
Due in 2026 through 2030 |  | 2.13 |  |  |  | 133,632,000 |  |  |  | 137,347,000 |
Due in 2031 and beyond |  | 2.64 |  |  |  | 70,554,000 |  |  |  | 72,000,000 |
Mortgage-backed securities |  | 2.57 |  |  |  | 34,765,000 |  |  |  | 36,033,000 |
Other investments |  | 4.50 |  |  |  | 500,000 |  |  |  | 500,000 |
Total available for sale securities |  | 2.27% |  |  | $ | 299,958,000 |  |  | $ | 307,661,000 |

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