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Note 2 - Securities (Tables) | 6 Months Ended
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Jun. 30, 2021
Notes Tables |
Available-for-sale Securities [Table Text Block] |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
June 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 323,641,000 |  |  | $ | 423,000 |  |  | $ | (3,923,000 | ) |  | $ | 320,141,000 |
Mortgage-backed securities |  |  | 36,803,000 |  |  |  | 813,000 |  |  |  | (297,000 | ) |  |  | 37,319,000 |
Municipal general obligation bonds |  |  | 124,808,000 |  |  |  | 4,754,000 |  |  |  | (127,000 | ) |  |  | 129,435,000 |
Municipal revenue bonds |  |  | 18,467,000 |  |  |  | 363,000 |  |  |  | (100,000 | ) |  |  | 18,730,000 |
Other investments |  |  | 500,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 500,000 |
|  | $ | 504,219,000 |  |  | $ | 6,353,000 |  |  | $ | (4,447,000 | ) |  | $ | 506,125,000 |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 242,522,000 |  |  | $ | 516,000 |  |  | $ | (897,000 | ) |  | $ | 242,141,000 |
Mortgage-backed securities |  |  | 23,869,000 |  |  |  | 1,021,000 |  |  |  | 0 |  |  |  | 24,890,000 |
Municipal general obligation bonds |  |  | 101,991,000 |  |  |  | 5,833,000 |  |  |  | 0 |  |  |  | 107,824,000 |
Municipal revenue bonds |  |  | 11,521,000 |  |  |  | 473,000 |  |  |  | (2,000 | ) |  |  | 11,992,000 |
Other investments |  |  | 500,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 500,000 |
|  | $ | 380,403,000 |  |  | $ | 7,843,000 |  |  | $ | (899,000 | ) |  | $ | 387,347,000 |
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, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 252,288,000 |  |  | $ | 3,900,000 |  |  | $ | 3,977,000 |  |  | $ | 23,000 |  |  | $ | 256,265,000 |  |  | $ | 3,923,000 |
Mortgage-backed securities |  |  | 13,972,000 |  |  |  | 297,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 13,972,000 |  |  |  | 297,000 |
Municipal general obligation bonds |  |  | 19,301,000 |  |  |  | 127,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 19,301,000 |  |  |  | 127,000 |
Municipal revenue bonds |  |  | 9,187,000 |  |  |  | 100,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 9,187,000 |  |  |  | 100,000 |
|  | $ | 294,748,000 |  |  | $ | 4,424,000 |  |  | $ | 3,977,000 |  |  | $ | 23,000 |  |  | $ | 298,725,000 |  |  | $ | 4,447,000 |
|  | Less than 12 Months |  |  | 12 Months or More |  |  | Total |
|  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |  |  | Fair Value |  |  | Unrealized Loss |
December 31, 2020 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 118,650,000 |  |  | $ | 897,000 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 118,650,000 |  |  | $ | 897,000 |
Mortgage-backed securities |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Municipal general obligation bonds |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |  |  |  | 0 |
Municipal revenue bonds |  |  | 423,000 |  |  |  | 2,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 423,000 |  |  |  | 2,000 |
|  | $ | 119,073,000 |  |  | $ | 899,000 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 119,073,000 |  |  | $ | 899,000 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Weighted Average Yield |  |  | Amortized Cost |  |  | Fair Value |
Due in 2021 |  |  | 3.29% |  |  | $ | 881,000 |  |  | $ | 886,000 |
Due in 2022 through 2026 |  |  | 1.06 |  |  |  | 172,553,000 |  |  |  | 173,442,000 |
Due in 2027 through 2031 |  |  | 1.60 |  |  |  | 234,940,000 |  |  |  | 235,320,000 |
Due in 2032 and beyond |  |  | 2.03 |  |  |  | 58,542,000 |  |  |  | 58,658,000 |
Mortgage-backed securities |  |  | 1.83 |  |  |  | 36,803,000 |  |  |  | 37,319,000 |
Other investments |  |  | 3.75 |  |  |  | 500,000 |  |  |  | 500,000 |
Total available for sale securities |  |  | 1.49% |  |  | $ | 504,219,000 |  |  | $ | 506,125,000 |

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