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Note 2 - Securities (Tables) | 6 Months Ended
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Jun. 30, 2018
Notes Tables |
Available-for-sale Securities [Table Text Block] |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
June 30, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 193,956,000 |  |  | $ | 29,000 |  |  | $ | (11,805,000 | ) |  | $ | 182,180,000 |
Mortgage-backed securities |  |  | 45,397,000 |  |  |  | 224,000 |  |  |  | (1,064,000 | ) |  |  | 44,557,000 |
Municipal general obligation bonds |  |  | 101,252,000 |  |  |  | 381,000 |  |  |  | (1,481,000 | ) |  |  | 100,152,000 |
Municipal revenue bonds |  |  | 3,816,000 |  |  |  | 5,000 |  |  |  | (68,000 | ) |  |  | 3,753,000 |
Other investments |  |  | 500,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 500,000 |
|  | $ | 344,921,000 |  |  | $ | 639,000 |  |  | $ | (14,418,000 | ) |  | $ | 331,142,000 |
December 31, 201 7 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 175,953,000 |  |  | $ | 99,000 |  |  | $ | (6,352,000 | ) |  | $ | 169,700,000 |
Mortgage-backed securities |  |  | 38,967,000 |  |  |  | 335,000 |  |  |  | (510,000 | ) |  |  | 38,792,000 |
Municipal general obligation bonds |  |  | 121,040,000 |  |  |  | 891,000 |  |  |  | (638,000 | ) |  |  | 121,293,000 |
Municipal revenue bonds |  |  | 3,978,000 |  |  |  | 30,000 |  |  |  | (30,000 | ) |  |  | 3,978,000 |
Other investments |  |  | 2,010,000 |  |  |  | 0 |  |  |  | (29,000 | ) |  |  | 1,981,000 |
|  | $ | 341,948,000 |  |  | $ | 1,355,000 |  |  | $ | (7,559,000 | ) |  | $ | 335,744,000 |
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, 2018 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 74,410,000 |  |  | $ | 2,780,000 |  |  | $ | 103,448,000 |  |  | $ | 9,025,000 |  |  | $ | 177,858,000 |  |  | $ | 11,805,000 |
Mortgage-backed securities |  |  | 19,792,000 |  |  |  | 603,000 |  |  |  | 15,028,000 |  |  |  | 461,000 |  |  |  | 34,820,000 |  |  |  | 1,064,000 |
Municipal general obligation bonds |  |  | 64,436,000 |  |  |  | 847,000 |  |  |  | 13,321,000 |  |  |  | 634,000 |  |  |  | 77,757,000 |  |  |  | 1,481,000 |
Municipal revenue bonds |  |  | 1,597,000 |  |  |  | 14,000 |  |  |  | 1,061,000 |  |  |  | 54,000 |  |  |  | 2,658,000 |  |  |  | 68,000 |
Other investments |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
|  | $ | 160,235,000 |  |  | $ | 4,244,000 |  |  | $ | 132,858,000 |  |  | $ | 10,174,000 |  |  | $ | 293,093,000 |  |  | $ | 14,418,000 |
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
December 31, 2017 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 35,677,000 |  |  | $ | 434,000 |  |  | $ | 115,374,000 |  |  | $ | 5,918,000 |  |  | $ | 151,051,000 |  |  | $ | 6,352,000 |
Mortgage-backed securities |  |  | 10,179,000 |  |  |  | 156,000 |  |  |  | 21,084,000 |  |  |  | 354,000 |  |  |  | 31,263,000 |  |  |  | 510,000 |
Municipal general obligation bonds |  |  | 12,807,000 |  |  |  | 114,000 |  |  |  | 54,703,000 |  |  |  | 524,000 |  |  |  | 67,510,000 |  |  |  | 638,000 |
Municipal revenue bonds |  |  | 0 |  |  |  | 0 |  |  |  | 1,187,000 |  |  |  | 30,000 |  |  |  | 1,187,000 |  |  |  | 30,000 |
Other investments |  |  | 1,510,000 |  |  |  | 29,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 1,510,000 |  |  |  | 29,000 |
|  | $ | 60,173,000 |  |  | $ | 733,000 |  |  | $ | 192,348,000 |  |  | $ | 6,826,000 |  |  | $ | 252,521,000 |  |  | $ | 7,559,000 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Weighted Average Yield |  |  | Amortized Cost |  |  | Fair Value |
Due in 2018 |  |  | 1.68 | % |  |  | $ | 9,296,000 |  |  | $ | 9,289,000 |
Due in 2019 through 2023 |  |  | 2.18 |  |  |  |  | 77,853,000 |  |  |  | 76,964,000 |
Due in 2024 through 2028 |  |  | 2.61 |  |  |  |  | 106,754,000 |  |  |  | 101,512,000 |
Due in 2029 and beyond |  |  | 3.04 |  |  |  |  | 105,121,000 |  |  |  | 98,320,000 |
Mortgage-backed securities |  |  | 2.59 |  |  |  |  | 45,397,000 |  |  |  | 44,557,000 |
Other investments |  |  | 2.56 |  |  |  |  | 500,000 |  |  |  | 500,000 |
Total available for sale securities |  |  | 2.62 | % |  |  | $ | 344,921,000 |  |  | $ | 331,142,000 |

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