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Note 2 - Securities (Tables) | 9 Months Ended
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Sep. 30, 2021
Notes Tables |
Debt Securities, Available-for-sale [Table Text Block] |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
September 30, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 368,990,000 |  |  | $ | 350,000 |  |  | $ | (4,954,000 | ) |  | $ | 364,386,000 |
Mortgage-backed securities |  |  | 39,299,000 |  |  |  | 698,000 |  |  |  | (544,000 | ) |  |  | 39,453,000 |
Municipal general obligation bonds |  |  | 130,681,000 |  |  |  | 4,207,000 |  |  |  | (278,000 | ) |  |  | 134,610,000 |
Municipal revenue bonds |  |  | 20,468,000 |  |  |  | 327,000 |  |  |  | (180,000 | ) |  |  | 20,615,000 |
Other investments |  |  | 500,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 500,000 |
|  | $ | 559,938,000 |  |  | $ | 5,582,000 |  |  | $ | (5,956,000 | ) |  | $ | 559,564,000 |
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 |
Debt Securities, Available-for-sale, 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, 2021 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
U.S. Government agency debt obligations |  | $ | 274,190,000 |  |  | $ | 3,974,000 |  |  | $ | 48,317,000 |  |  | $ | 980,000 |  |  | $ | 322,507,000 |  |  | $ | 4,954,000 |
Mortgage-backed securities |  |  | 23,578,000 |  |  |  | 544,000 |  |  |  | 23,000 |  |  |  | 0 |  |  |  | 23,601,000 |  |  |  | 544,000 |
Municipal general obligation bonds |  |  | 32,180,000 |  |  |  | 278,000 |  |  |  | 0 |  |  |  | 0 |  |  |  | 32,180,000 |  |  |  | 278,000 |
Municipal revenue bonds |  |  | 11,098,000 |  |  |  | 158,000 |  |  |  | 820,000 |  |  |  | 22,000 |  |  |  | 11,918,000 |  |  |  | 180,000 |
|  | $ | 341,046,000 |  |  | $ | 4,954,000 |  |  | $ | 49,160,000 |  |  | $ | 1,002,000 |  |  | $ | 390,206,000 |  |  | $ | 5,956,000 |
|  | 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 |  |  | 2.25 | % |  | $ | 545,000 |  |  | $ | 547,000 |
Due in 2022 through 2026 |  |  | 1.01 |  |  |  | 187,220,000 |  |  |  | 188,005,000 |
Due in 2027 through 2031 |  |  | 1.56 |  |  |  | 266,478,000 |  |  |  | 265,719,000 |
Due in 2032 and beyond |  |  | 1.98 |  |  |  | 65,896,000 |  |  |  | 65,340,000 |
Mortgage-backed securities |  |  | 1.76 |  |  |  | 39,299,000 |  |  |  | 39,453,000 |
Other investments |  |  | 3.75 |  |  |  | 500,000 |  |  |  | 500,000 |
Total available for sale securities |  |  | 1.44 | % |  | $ | 559,938,000 |  |  | $ | 559,564,000 |

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